The present application relates to a silicon-containing compound, a current collector, a preparation method, an electrode sheet, and a use. The silicon-containing compound comprises one or more of compounds represented by formulas 1-6.
Disclosed in the present disclosure are a modified polyvinyl alcohol binder and a preparation method therefor, and a modified composite current collector. The preparation method comprises the following steps: alternately freezing and unfreezing an aqueous solution of polyvinyl alcohol, so as to obtain pre-crosslinked polyvinyl alcohol; and placing the pre-crosslinked polyvinyl alcohol in a lithium salt solution to treat same, so as to obtain the modified polyvinyl alcohol binder. The modified polyvinyl alcohol binder has a dual-crosslinked network and abundant branched chain structures, and has high extensibility and good bonding performance and lithium-replenishing effect. A modified composite current collector containing the modified polyvinyl alcohol binder can implement self-repairing during rolling extension to ensure the connection of a conductive network, thereby having good conductivity, and can perform lithium replenishment on an electrode material to counteract irreversible lithium loss caused by formation of an SEI film, thereby improving the total capacity, energy density and first-cycle coulombic efficiency of a lithium-ion battery and enabling the lithium-ion battery to have better electrochemical performance.
Disclosed herein are a carbon-coated current collector, a preparation method therefor, and a use thereof. The preparation method comprises the following steps: (1) performing pre-treatment and dispersion on a conductive carbon material: mixing the conductive carbon material with deionized water and a dispersant, and then performing homogenization treatment, to obtain a conductive carbon material premix; (2) mixing the conductive carbon material premix with deionized water, a binder, a wetting dispersant, and lithium carbonate, and performing dispersion to obtain a conductive slurry; and (3) coating the conductive slurry prepared in step (2) on a surface of a current collector and baking same, to obtain the carbon-coated current collector. In the present application, homogenization treatment is first performed on the conductive carbon material, and then same is mixed with the binder and dispersed, so that the compatibility between the conductive carbon material and the binder can be improved and the adaptability of a slurry formulation is improved. The lithium carbonate is added to the conductive slurry, such that the carbon coating layer, during formation, can provide a raw material for SEI formation, thereby reducing the consumption of a positive electrode material and ensuring the electrical performance and safety performance of a battery.
A modified polypropylene film, a preparation method therefor and a use thereof. A preparation raw material of the modified polypropylene film comprises modified polypropylene, and a modifier for the modified polypropylene comprises terpenol. The preparation method comprises the following steps: (1) melting, filtering and extruding the preparation raw material of the modified polypropylene film to obtain a molten material; and (2) casting the molten material obtained in step (1) onto a casting roller, performing cooling for formation, and carrying out two-way stretching to obtain the modified polypropylene film. Modified polypropylene is prepared using a specific modifier, and a modified polypropylene film having excellent performance is prepared by using the modified polypropylene as a preparation raw material, so that the modified polypropylene film is suitable for being used as a composite current collector base film.
C08L 51/06 - Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
The present application provides a composite current collector and a manufacturing method therefor and an application thereof. The composite current collector comprises a base, and a conductive underlayer and a conductive water-resistant layer which are sequentially stacked on the surface of at least one side of the base; the conductive underlayer comprises a conductive agent A, a conductive agent B, and a binder; and the conductive water-resistant layer comprises a conductive agent A, a conductive agent B, a cross-linking agent, and a binder. According to the present application, the composite current collector not only has high water resistance, but also has high conductivity and safety; the manufacturing costs are low, and the manufacturing method is simple; and the water resistance of the current collector is further improved without affecting the overall conductivity of the current collector and the bonding performance with an electrode material.
The present application relates to a composite current collector and a preparation method therefor, and an electrode sheet, a battery and an electric device. The composite current collector in the present application comprises a polymer film and a composite conductive layer arranged on at least one side of the polymer film, wherein the composite conductive layer comprises a metal oxide layer and a metal layer which are alternately stacked.
A composite current collector, and a manufacturing method therefor and an application thereof. The composite current collector comprises a conductive layer; and the conductive layer comprises a metal layer and an intermediate layer which are alternately stacked. On the one hand, the conductive layer generates micro-cracks in the nail penetration process, and the micro-cracks propagate to cause large-area breakage, such that the conductive layer is separated from a nail, positive and negative electrode current collectors are prevented from being conducted to form a closed loop, and thermal runaway of a battery caused by the closed loop is avoided, thereby greatly improving the safety performance of the battery. On the other hand, the intermediate layer can effectively inhibit the corrosion of the metal layer by fluorine ions in an electrolyte, such that the stability of the performance of the composite current collector in the charging and discharging cycle process can be improved.
A paste for a current collector and a preparation method for a carbon-coated aluminum foil current collector. The method comprises: uniformly stirring pure water and a binder to obtain a homogeneous solution; adding carbon powder into the homogeneous solution, and dispersing same to obtain a premixed paste; adding a cross-linking agent into the premixed paste, and continuously stirring same to obtain a mixed paste; taking pure water and a modified low-melting-point glass powder, and sanding same to obtain a glass powder solution; adding the glass powder solution into the mixed paste, dispersing and sanding same to obtain a water-based paste; and coating the surface of an aluminum foil with the water-based paste, and baking same to obtain the carbon-coated aluminum foil current collector. Adding the low-melting-point glass powder material with D50≤2 μm can cause a carbon-coated layer to undergo a transformation in electrical properties when the battery temperature abnormally rises to a specific temperature, thereby achieving insulation between electrode sheets and active materials, and ensuring the safety performance of batteries during use.
Provided in the present application are a flame-retardant current collector and a preparation method therefor, and an electrochemical energy storage device. The flame-retardant current collector comprises a current collector substrate and an electrically-conductive thermally-resistant coating, which covers the surface of the current collector substrate, wherein the electrically-conductive thermally-resistant coating contains an electrically-conductive thermally-resistant medium, an inner core of the electrically-conductive thermally-resistant medium is a thermally-resistant material, and a housing thereof is made of an electrically-conductive material. The flame-retardant current collector provided in the present application has relatively good conductivity and relatively strong thermal resistance performance, and the flame-retardant current collector can reduce the probability of thermal runaway occurring in an electrochemical energy storage device; and the flame-retardant current collector also has a simple structure and relatively low production cost, and is suitable for large-scale popularization and application.
The present invention relates to a carbon-coated current collector for a lithium battery, and in particular, to a preparation method for a carbon-coated aluminum foil current collector for a lithium battery. First, an aluminum foil undergoes degreasing and etching treatment; in order to improve the bonding force between the aluminum foil and a conductive slurry, the surface of the aluminum foil is pretreated by using a coating method, and then amino-terminated resin macromolecules and thiol functionalized carbon nanotubes are loaded onto the surface of the aluminum foil; citric acid and aniline are doped to prepare doped polyaniline, hydroxyl and carboxyl are thus introduced, and by grafting modification of hydroxyl and carboxyl, fluorinated polyaniline having an amino group is obtained; and the fluorinated polyaniline, conductive carbon black and an epoxy resin are blended and then applied on the pretreated aluminum foil, thereby obtaining a carbon-coated aluminum foil current collector having good conductivity and a strong bonding force.
The present application relates to a composite copper current collector, comprising a polymer base material layer (1). At least one side of the polymer base material layer (1) is provided with a first copper layer (2), the side of the first copper layer (2) distant from the polymer base material layer (1) is provided with a second copper layer (3), and the defect rate of the second copper layer (3) is less than or equal to 5%.
A fitting and flattening mechanism for a winding film. The fitting and flattening mechanism can rotate to press against a winding aluminum film, which is wound around a cold drum (3) and can move on the cold drum (3). The fitting and flattening mechanism for a winding film comprises: a support (2) which is arranged above the cold drum (3) and is parallel to the cold drum (3); and press-flat assemblies (1) which are arranged on the support (2), wherein two press-flat assemblies (1) are provided, and the press-flat assemblies (1) can move in an X direction on the support (2) and can rotate in the X direction relative to the support (2). Each press-flat assembly (1) comprises an adjusting module (11) and a pressing roller (12), wherein the adjusting module (11) can drive the pressing roller (12) to rotate in the X direction relative to the cold drum (3) and move in Z and Y directions so that the pressing roller (12) can press against and fit the winding aluminum film onto the cold drum (3).
In order to improve the conductivity of a current collector, provided is a high-conductivity conductive adhesive. In order to enhance the conductivity of the conductive adhesive, the addition amount of a conductive carbon material is firstly increased; in addition, in order to avoid performance reduction caused by excessive conductive carbon materials, a branched modified polyurethane acrylate resin is used, and a spheroidal space structure of the branched modified polyurethane acrylate resin is used to reduce the overall viscosity of the adhesive, such that the flowing property thereof is improved, and the compatibility and dispersity of the conductive carbon material in a system are improved; and the branched modified polyurethane acrylate resin further has a large number of acrylic groups, such that the complexity of a cross-linked network can be further improved, the viscosity of the adhesive is effectively improved, and the reduction of the adhesive property thereof is avoided on the basis of improving the conductivity thereof.
C08F 220/18 - Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
C09D 151/08 - Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
A flame-retardant thin film, a current collector, an electrode, and a battery, relating to the technical field of flame-retardant batteries. An inner-layer thin film is prepared by blending polytetrafluoroethylene and potassium perfluorobutanesulfonate, a middle-layer thin film is prepared by blending polybutylene terephthalate and ytterbium trifluoromethanesulfonate, an outer-layer thin film is prepared by blending polystyrene and triphenyl phosphate, and a flame-retardant thin film is prepared by hot-pressing the three layers of thin films. Compared with a conventional single-layer flame-retardant thin film, the prepared sandwich-type multi-layer flame-retardant thin film has a synergistic effect and has more excellent flame retardance and mechanical properties.
B32B 27/08 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance of synthetic resin of a different kind
B32B 33/00 - Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
The present application relates to the technical field of lithium batteries, and in particular to a high-conductivity, low-water-absorption nano-carbon-coated current collector, and a preparation method therefor. Raw materials including a conductive material A, a conductive adhesive and a conductive material B are selected; the conductive material A is coated in the conductive adhesive and dried, so that particles of the conductive material A are partially coated in the conductive adhesive, thereby partially blocking the water absorption performance of conductive material A, but also reducing conductive performance. In order to enhance conductivity, the conductive material B is added, and in addition, barium carbonate is added, which may further enhance safety during high-rate charging and discharging, so that the prepared high-conductivity, low-water-absorption nano-carbon-coated current collector comprises a conductive base layer and a nano conductive layer; that is, the current collector has relatively low water absorption, relatively high conductive performance; Manufacturing costs are low, and a method is simple.
The present application relates to the field of electrode materials, and specifically to a high-conductivity nano-coated current collector, an electrode, a battery, and a method for preparing the current collector. The high-conductivity nano-coated current collector comprises a current collector and a nano conductive coating coated on two surfaces thereof, the nano conductive coating containing a graphene oxide grafted binder. The method for preparing the high-conductivity nano-coated current collector comprises the following steps: step 1: preparing a graphene oxide grafted binder; step 2: preparing a coating slurry, the coating slurry comprising the graphene oxide grafted binder; and step 3: coating the coating slurry on at least one surface of the current collector, and drying to prepare the coated current collector. The present application involves adding a graphene oxide grafted binder into a coating, giving the binder a certain conductivity, and allowing same to bind the conductive material and the current collector without affecting the overall conductive effect of the electrode.
A doctor blade mechanism and a coater having a doctor blade mechanism. The doctor blade mechanism comprises: an angle adjustment assembly having an angle adjustment end, a doctor blade being hinged on the angle adjustment end; a fine-tuning assembly having a second linear output end, the second linear output end being connected to the angle adjustment assembly; and a position setting assembly having a first linear output end, the first linear output end being connected to the fine-tuning assembly for setting a position when a blade is being replaced. The angle adjustment end is further provided with a buffering control assembly that provides buffering support for the doctor blade. When a deflection force to which the doctor blade is subjected is greater than a buffering force threshold provided by the buffering control assembly, the doctor blade is driven by the deflection force and is deflected. At this time, the buffering control assembly can perform telescopic adjustment and allow the buffering force threshold provided by the buffering control assembly to remain unchanged.
B05C 11/04 - Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface; Control of the thickness of a coating with blades
18.
CARBON-COATED CURRENT COLLECTOR CONTAINING LITHIUM-SUPPLEMENTING COATING AND PREPARATION METHOD THEREFOR, AND LITHIUM BATTERY
Provided are a carbon-coated current collector containing a lithium-supplementing coating and a preparation method therefor, and a lithium battery, relating to the technical field of lithium battery materials. The preparation method for the carbon-coated current collector containing a lithium-supplementing coating comprises: carrying out chemical erosion on a current collector base material, and embedding a lithium-supplementing material to form a lithium-supplementing coating; and then coating the surface of the lithium-supplementing coating with a conductive carbon-coated layer slurry to form a conductive carbon-coated layer. The current collector base material is chemically eroded, the lithium-supplementing coating is attached to the current collector base material and then a conductive carbon-coated layer is attached, so that the surface tension of a current collector can be increased, thereby facilitating coating and attachment of an electrode active material; moreover, the introduction of the conductive carbon-coated layer can reduce the contact resistance between the electrode active material and the current collector, improve the use consistency of a lithium battery pack, and can greatly reduce the costs of the lithium battery pack while improving the performance of a lithium battery.
The present application provides a composite current collector, a preparation method therefor, an electrode and a secondary battery. The composite current collector comprises a polymer base film and composite layers provided on two sides of the polymer base film. Each composite layer comprises a modified layer provided on the polymer base film and a metal layer provided on the surface of the modified layer, the material of the modified layer being a polymer formed by in-situ polymerization of a polymerized monomer on the surface of the polymer base film, and the term "polymerized monomer" comprising an acrylamide-based monomer, a butenoic acid-based monomer, or a combination thereof.
A composite current collector, a preparation method therefor, an electrode, and a secondary battery. The composite current collector comprises: a polymer base film and composite layers provided on two sides of the polymer base film. Each composite layer comprises: a modified layer arranged on the polymer base film, and a metal layer arranged on the surface of the modified layer, wherein the material of the modified layer is a polymer formed by in-situ graft polymerization of a polymerized monomer and/or oligomer on the surface of the polymer base film; and the polymerized monomer comprises an acrylamide monomer, a crotonic acid monomer, or a combination thereof.
The present application relates to a conductive binder and a preparation method therefor, a current collector, an electrode and a battery. The conductive binder comprises a first polymer binder grafted with a conductive group and a second polymer binder grafted with a conductive group, wherein the molecular weight of the first polymer binder is greater than that of the second polymer binder.
C09J 151/06 - Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
22.
BINDER, CARBON-COATED SLURRY, CARBON-COATED CURRENT COLLECTOR, PREPARATION METHOD FOR BINDER, ELECTRODE, AND BATTERY
The present application relates to a binder, a carbon-coated slurry, a carbon-coated current collector, a preparation method for the binder, an electrode, and a battery. The preparation method for the binder comprises: mixing an alkali divalent metal ion compound and a polymer binder in a solvent to obtain a mixed solution; and enabling the mixed solution to undergo a cross-linking reaction, wherein the structural unit of the polymer binder contains a carboxyl group; and the cross-linking reaction is carried out under a weak acid condition, and the pH under the weak acid condition satisfies 5≤pH<7.
A foil-rolling oil removal device, comprising a foil roller (100), an extraction tank (200), and a dryer (300), which are sequentially arranged in a foil movement direction, wherein the extraction tank is configured to hold an extraction agent; a liquid seal structure is provided at an opening of the extraction tank; the foil roller is configured to roll a foil; and the dryer is configured to dry the foil. The foil-rolling oil removal device further comprises a foil conveyor configured to convey the foil from the foil roller, through the extraction tank to the dryer. Also provided is a rolling oil removal method using the foil-rolling oil removal device. The device removes oil from the foil by way of extraction, and the extraction tank is sealed by means of the liquid seal structure, thereby reducing volatilization of the extraction agent and reducing the impact of condensed water on the surface performance of the foil.
B21B 45/02 - Devices for surface treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
B21B 1/40 - Metal rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
F26B 21/02 - Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
24.
ALUMINUM-PLASTIC COMPOSITE FILM AND PREPARATION METHOD THEREFOR
An aluminum-plastic composite film and a preparation method therefor. The aluminum-plastic composite film comprises a nylon protective layer, a composite aluminum foil layer, and a CPP heat sealing layer; the composite aluminum foil layer comprises a polymer layer and an aluminum layer; the aluminum layer is formed on at least one surface of the polymer layer by means of a physical vapor deposition method. According to the aluminum-plastic composite film and the preparation method therefor, the aluminum layer is deposited on the surface of the polymer layer in a physical vapor deposition mode, and a traditional aluminum foil layer is replaced with the composite aluminum foil layer having the polymer layer, so that the elongation at break is greatly improved, and the deep drawing performance of the prepared aluminum-plastic film is greatly improved, facilitating production and processing of aluminum-plastic films; the composite aluminum foil layer having the polymer layer has good pinhole resistance, greatly improving the safety performance of soft-pack lithium-ion batteries; additionally, due to the introduction of the polymer layer, the cost proportion of the aluminum foil layer in the raw materials of the aluminum-plastic film is also reduced, saving nonferrous metals and costs.
B32B 27/06 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance
B32B 27/08 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance of synthetic resin of a different kind
The present application relates to a coating module, comprising a gravure roller and a support. The gravure roller is mounted on the support. The coating module further comprises an air blowing device, and the air blowing device is used for blowing air to slurry at the junction of the gravure roller and a film. A heating element is provided in the air blowing device. An adjusting device used for adjusting the position of an air blowing opening of the air blowing device is mounted on the support. According to the present application, the moisture of the slurry can be evaporated to avoid dripping of the slurry, thereby reducing the waste of raw materials, avoiding uneven application of the slurry to a composite current collector, and improving the product quality.
B05C 9/14 - Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by groups , or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating
B05D 3/04 - Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
The present application relates to a gravure roller mechanism and a coating module. The mechanism comprises a roller sleeve (12), the roller sleeve (12) being hollow inside; and a magnetic field generation device (15) accommodated in the roller sleeve (12), wherein the magnetic field generation device (15) comprises a microwave generator (151) and at least two magnetic field enhancement elements (153), the magnetic field enhancement elements (153) being arranged on an outer side of the microwave generator in a circumferential direction; the microwave generator (151) emits microwaves to the circumferential magnetic field enhancement elements (153) in the circumferential direction, and the microwaves in the magnetic field enhancement elements (153) are reflected to form magnetic fields in the magnetic field enhancement elements (153); the two adjacent magnetic field enhancement elements (153) are either fitted to each other, or are close to each other to be approximately fitted to each other, such that the magnetic fields in the two magnetic field enhancement elements (153) converge and superpose to form a strong magnetic field; and the roller sleeve (12) is located in the strong magnetic field. The strong magnetic field ionizes gas on the surface of the roller sleeve (12), providing the roller sleeve (12) with hydrophilicity; and the magnetic generation device (15) is accommodated in the roller sleeve (12), such that the gravure roller mechanism is more compact.
B05C 5/00 - Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
B29C 59/14 - Surface shaping, e.g. embossing; Apparatus therefor by plasma treatment
H01L 21/205 - Deposition of semiconductor materials on a substrate, e.g. epitaxial growth using reduction or decomposition of a gaseous compound yielding a solid condensate, i.e. chemical deposition
27.
CONDUCTIVE AGENT, PREPARATION METHOD THEREFOR AND USE THEREOF, AND CURRENT COLLECTOR, PREPARATION METHOD THEREFOR AND USE THEREOF
The present application relates to a conductive agent, a preparation method therefor and a use thereof, and a current collector, a preparation method therefor and a use thereof. The conductive agent comprises an organic oligomer and conductive powder, and the conductive powder is grafted to the organic oligomer. The conductive agent not only has conductive properties, but also modifies the conductive powder by means of the organic oligomer, so that the conductive powder is grafted to the organic oligomer. The organic oligomer can form a hydrophobic thin film on the surface of the conductive powder, so that the conductive powder has low water absorption and is not prone to be affected by moisture in the air, and thus can be used for preparing a conductive coating having low water absorption.
The present application relates to a conductive agent, a preparation method therefor and the use thereof, and a current collector, a manufacturing method therefor, and the use thereof. The conductive agent comprises an organic oligomer and a conductive powder, the conductive powder being grafted to the organic oligomer. The conductive agent has conductivity; and since the conductive powder is modified by using the organic oligomer so as to graft the conductive powder to the organic oligomer, the organic oligomer can form a hydrophobic thin film layer on the surface of the conductive powder, so that the conductive powder has relatively low water absorption and thus is not liable to be affected by moisture in air. Therefore, the conductive agent can be used for preparing conductive coatings having low water absorption.
C09D 133/12 - Homopolymers or copolymers of methyl methacrylate
C09D 151/10 - Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to inorganic materials
H01B 1/20 - Conductive material dispersed in non-conductive organic material
H01B 13/00 - Apparatus or processes specially adapted for manufacturing conductors or cables
Disclosed in the present invention are a polymer membrane as well as a preparation method therefor, and a composite current collector. The preparation process of the polymer membrane comprises soaking, cleaning, heat treatment and so on, and specifically, a cross-linking agent is used to carry out cross-linking treatment on a high-molecular polymer membrane, so as to improve the tensile strength and the heat resistance of the polymer membrane. The composite current collector can be prepared by using the polymer membrane as a base material, such that the membrane breakage rate and the heat shrinkage rate of the composite current collector are greatly reduced, thus significantly improving the tensile strength.
Disclosed herein are a polymer film, a method for preparing the same, and a composite current collector comprising the same. The polymer film preparation method comprises soaking, washing, and heat treatment, wherein a polymer film is subjected to a crosslinking treatment with a crosslinking agent to improve its tensile strength and heat resistance.
Disclosed in the present invention are a solid-phase polycondensation polyester film and a preparation method therefor, a composite current collector, an electrode plate and a battery. The preparation method comprises a heat treatment-solid-phase polycondensation reinforcement process, and the heat treatment-solid-phase polycondensation reinforcement process refers to feeding a polyester film into a heat treatment system to perform a solid-phase polycondensation reaction, such that the heat resistance and tensile strength of the polyester film can be improved, and when the reinforced solid phase polycondensation polyester film is used for preparing a composite current collector, the heat resistance is better.
B32B 27/06 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance
Disclosed in the present invention are a heat-resistant and tensile-strength-enhanced polyester film, a preparation method therefor and a composite current collector. Raw materials of the polyester film comprise a polyester macromolecule; the polyester film is formed by using melt extrusion, and longitudinal stretching and transverse stretching are performed after the film is formed. The tensile strength and heat resistance of the polyester film are significantly improved. A composite current collector is prepared by taking the polyester film as a base material; and the film rupture rate of the composite current collector is significantly reduced, and the mechanical properties and heat resistance thereof are significantly improved.
The present invention relates to a composite current collector and a preparation method therefor, and an electrode plate and a secondary battery. The composite current collector comprises a polymer base membrane, and aluminum-plated layers, which are arranged on the surfaces of two sides of the polymer base membrane, wherein the aluminum-plated layer comprises a first sub-layer and a second sub-layer; the first sub-layer is closer to the polymer base membrane than the second sub-layer; and the particle size of aluminum particles in the first sub-layer is 10 nm to 30 nm, and the particle size of aluminum particles in the second sub-layer is 80 nm to 100 nm. The composite current collector not only has relatively high conductivity, but also has relatively high surface energy; and during a coating process of an active substance, the interface internal resistance between a battery electrode plate and a current collector can be significantly improved, thereby improving the capacity and cycling performance of a lithium battery.
The present invention relates to a composite current collector and a preparation method therefor, an electrode sheet, and a secondary battery. The composite current collector comprises: a polymer composite layer and aluminum plated layers. The polymer composite layer comprises a BOPP film and PET films arranged on two sides of the BOPP film; two aluminum plated layers are comprised; each aluminum plated layer is arranged on one PET film, and the aluminum plated layers are arranged on the sides of the PET films away from the BOPP film. The composite current collector has relatively high tensile strength and relatively high elongation.
The present invention relates to a composite current collector and a preparation method therefor, and an electrode plate and a secondary battery. The composite current collector comprises: a porous polymer film and aluminum-plated layers, which are arranged on surfaces of two sides of the porous polymer film, wherein the pore diameter D50 of the porous polymer film is less than or equal to 60 nm, and the porosity thereof is less than 80%. In the process of manufacturing a lithium battery, after the composite current collector is subjected to a rolling process, cases of electrode plate breakage are significantly reduced, and the unit weight of the composite current collector is reduced, thereby significantly improving the energy density of the battery.
The present invention relates to the technical field of new materials, and in particular to an electron-rich negative electrode current collector and a preparation method therefor, and an electrode plate and a battery. In the present invention, an electron-rich nano-copper layer with the charge quantity distribution of 200 eV/mm2to 500 eV/mm2 is provided on the surface of a polymer substrate layer, such that the oxidation of copper can be effectively prevented, and an additional zinc or chromium anti-oxidation layer does not need to be additionally provided, so as to greatly reduce interface resistance between different metal layers in a traditional technique, thereby improving the performance of a current collector; moreover, the step of galvanizing or chromium plating a surface of a copper-containing current collector is omitted, production costs are effectively reduced, and the present invention brings about less pollution to the environment, and is more environmentally friendly. In addition, by means of a composite of a polymer and metal, the energy density of the current collector is effectively improved, and compared with a traditional all-metal current collector, a battery is made lighter and thinner.
The present application relates to a lithium-rich composite current collector for use in a positive electrode and a method for preparing the same. The lithium-rich composite current collector includes a polymer layer, two deposited aluminum layers, and two lithium-rich layers, wherein the two deposited aluminum layers are respectively disposed on two opposite surfaces of the polymer layer; and the two lithium-rich layers are respectively disposed on surfaces of the two deposited aluminum layers away from the polymer layer. By disposing the deposited aluminum layers and the lithium-rich layers on the surfaces of the polymer layer, the lithium-rich composite current collector has relatively high strength and ductility. Additionally, due to the presence of the lithium-rich layers, the lithium metal therein can compensate for the initial consumption of active lithium in the process of forming the solid electrolyte interface (SEI) film in the battery, and increase the amount of active lithium in the battery, which can increase the capacity and the cycle life of the battery.
The present application relates to an electron-rich current collector for use in a negative electrode, a method for preparing the same, an electrode plate, and a battery. In the present application, the nano copper layer is electron-rich and has the energy distribution of electric charges ranging, for example, from 200 eV/mm2to 500 eV/mm2. By disposing the nano copper layers on the surfaces of the polymer substrate layer, there is no need for an additional zinc or chromium anti-oxidation layer, and the oxidation of copper can be prevented or minimized.
COMPOSITE CURRENT COLLECTOR HAVING METAL THREE-DIMENSIONAL NETWORK STRUCTURE, PREPARATION METHOD FOR COMPOSITE CURRENT COLLECTOR, AND ELECTRODE PLATE AND BATTERY
A composite current collector, a preparation method therefor, an electrode plate and a battery. The composite current collector comprises a substrate layer and two metal layers respectively arranged on two sides of the substrate layer. The substrate layer is composed of a polymer backbone and a filling area, the polymer backbone has channels which are in communication with each other, and the channels are filled with a metal material, thereby forming a continuous metal three-dimensional network structure. The metal material is uniformly distributed in the substrate layer, such that a plurality of current channels are provided for electrons, which enables the composite current collector to have relatively small sheet resistance and relatively strong electrical conductivity, and the metal three-dimensional network structure can also be connected to the metal layers on the two sides, so as to form a whole.
The present invention relates to the technical field of new materials, and in particular, to a composite current collector having a metal three-dimensional network structure and a preparation method therefor, an electrode sheet and a battery. According to the present invention, by filling a metal material in channels of a polymer framework having mutually communicated channels, the diameter of the cross section of each channel being 200 nm to 500 nm, a continuous three-dimensional network structure made of a metal material can be formed, the metal material is uniformly distributed in a matrix layer, so that a plurality of current channels are provided for electrons, such that the composite current collector can have relatively small sheet resistance and high conductivity, and the metal three-dimensional network structure can also be connected to metal layers on two sides to form a whole, thereby overcoming the defect that film layers made of different materials in a traditional composite current collector are easy to separate, and the metal material is uniformly alternated in the matrix layer, so that the composite current collector finished product can better have both the strength of the metal material and the toughness of a polymer material.
The present application relates to a positive electrode lithium-rich composite current collector and a preparation method therefor. The positive electrode lithium-rich composite current collector comprises a polymer layer, two aluminized layers and two lithium-rich layers, wherein the two aluminized layers are respectively arranged on two opposite surfaces of the polymer layer, and the two lithium-rich layers are respectively arranged on the surfaces, away from the polymer layer, of the two aluminized layers. By arranging the aluminized layers and the lithium-rich layers on the surfaces of the polymer layer in the solution, on one hand, the positive electrode lithium-rich composite current collector has higher strength and elongation, on the other hand, due to the presence of the lithium-rich layers, after lithium metal is used in a battery, the consumption of active lithium during the process of forming an SEI film (solid electrolyte interface) in the early stage can be made up, and the content of active lithium in the battery is increased, such that not only can the capacity of the battery be improved, but the cycle life of the battery can also be prolonged.
The present invention relates to a copper brush plating process for a plastic film. The process comprises: performing first copper plating treatment on a plastic film by using a physical vapor deposition method, so as to prepare a first copper film on one surface of the plastic film and prepare a second copper film on the other surface; and performing second copper plating treatment on the first copper film and the second copper film by using a copper brush plating mode, so as to prepare a third copper film on the first copper film and prepare a fourth copper film on the second copper film. An anode of the second copper plating treatment is a brush plating roller; and a copper plating solution used in the second copper plating treatment comprises water, copper sulfate, sulfuric acid, chloride ions, 1,4-cyclohexanedione monoethylene acetal, phthalimide potassium salt, and a polyol compound. The copper plating process is high in plating speed, can obtain a copper film layer with fine, continuous, and uniform crystals, and have no adverse effect on an original copper plating film layer; the binding force of a plated film layer is excellent; the film surface sheet resistance can meet requirements of a finished product by means of one-time brush plating film forming; the plastic film is not punctured; and the copper plating process is suitable for amplification application.
The present invention relates to a copper plating additive, a copper plating solution and the use thereof. The copper plating additive comprises 1,4-cyclohexanedione monoethylene acetal, a phthalimide potassium salt and an amino polyol compound. The 1,4-cyclohexanedione monoethylene acetal can significantly improve the brightness of a brush-plated copper layer; the phthalimide potassium salt can effectively improve the dissolution efficiency of the 1,4-cyclohexanedione monoethylene acetal, and meanwhile, plays a role in refining crystal grains, flattening, and improving the uniformity and thickness of a plated layer; and the amino polyol compound can greatly change the hue of the copper layer to make the copper layer brighter. Moreover, the copper plating additive has the advantages of being environment friendly, having no toxicity, costing low and the like, and is suitable for large-scale industrial production. When the copper plating additive is added into a copper plating solution, a small added amount can greatly improve the thickness, brightness and saturation of the plated layer while not changing the stability of an original copper plating solution or the performance of an original copper plated layer.
Provided are a copper plating additive composition, a copper plating solution, and a copper brush plating method using the same. The copper plating additive composition includes 1, 4-cyclohexanedione monoethylene acetal, potassium phthalimide, and an amino polyol compound.
An ultrasonic welding method for a tab, comprising the following steps: sequentially unwinding a first foil (11), a composite foil (12) and a second foil (13), so that the first foil (11), the composite foil (12) and the second foil (13) are sequentially stacked to form intermediates of laminated foils (1); respectively welding the first foil (11) and the second foil (13) to two opposite surfaces of the composite foil (12) in an ultrasonic welding manner to obtain the laminated foils (1); and laminating the laminated foils (1) to a set number of layers, and sequentially welding the plurality of laminated foils (1) in an ultrasonic welding manner to form a laminated weldment (21). According to the ultrasonic welding method for a tab, first, the first foil (11), the composite foil (12) and the second foil (13) are sequentially stacked, and during welding, ultrasonic welding directly acts on energy on the first foil (11) and the second foil (13), so that the energy generated by direct contact of ultrasonic welding with the composite foil (12) can be reduced, the problems of over-welding, welding penetration and poor welding in the welding process are effectively avoided, and the welding effect is guaranteed; then the plurality of laminated foils (1) are sequentially stacked and welded, so that the distance between the plurality of laminated foils (1) can be shortened.
B23K 20/10 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
H01M 50/534 - Electrode connections inside a battery casing characterised by the material of the leads or tabs
H01M 50/536 - Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
H01M 50/538 - Connection of several leads or tabs of wound or folded electrode stacks
46.
TAB ULTRASONIC WELDING METHOD AND TAB WELDING DEVICE
Provided is a tab ultrasonic welding method, comprising the following steps: sequentially unwinding a first foil (11), a composite foil (12) and a second foil (13), such that the first foil (11), the composite foil (12) and the second foil (13) are laminated in sequence to form an intermediate of a laminated foil; respectively welding the first foil (11) and the second foil (13) to two opposite surfaces of the composite foil (12) in an ultrasonic welding manner to obtain the laminated foil (1); laminating the laminated foil (1) to a set number of layers n to form a laminate (21), n being greater than or equal to 1; and welding the laminate (21) and a tab (22) in the ultrasonic welding manner to form a tab assembly (2). The first foil (11), the composite foil (12) and the second foil (13) are laminated in sequence, and during welding, ultrasonic welding directly applies energy to the first foil (11) and the second foil (13), such that the energy generated from direct contact of ultrasonic welding with the composite foil (12) can be reduced, the problems of over-welding, welding penetration and poor soldering in the welding process are effectively avoided, and the welding effect is ensured.
B23K 20/10 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
B29C 65/08 - Joining of preformed parts; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
H01M 50/536 - Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
The present invention relates to a tab welding device, comprising: an unwinding mechanism, a pressing mechanism, a first welding mechanism, a second welding mechanism, and a winding mechanism. The unwinding mechanism is used for unwinding a first foil, a second foil, and a composite foil; the pressing mechanism is used for pressing a laminated foil formed by sandwiching the composite foil between the first foil and the second foil; and the first welding mechanism is used for welding the first foil and the second foil to two opposite surfaces of the composite foil, respectively. According to the present invention, the first foil, the second foil, and the composite foil are unwound by means of the unwinding mechanism; the pressing mechanism can press the laminated foil formed by sandwiching the composite foil between the first foil and the second foil, so as to prepare for the welding of the laminated foil; the first welding mechanism can reduce energy generated by the first welding mechanism in direct contact with the composite foil, and apply the energy to the first foil and the second foil; and the welding effect of the laminated foil can be ensured, and the problems of over-welding, through-welding, and false-welding in a welding process can be avoided.
The present application relates to a conductive device (100) for film plating and a film plating machine (300). The conductive device (100) for film plating comprises a frame (110) and two conductive mechanisms (120). The frame (110) is provided with a plating tank; each conductive mechanism (120) comprises a conductive roller (121), a titanium basket (122), and a rectifier (123); a positive electrode of the rectifier (123) is electrically connected to the titanium basket (122), and a negative electrode of the rectifier (123) is electrically connected to the conductive roller (121); the titanium basket (122) is at least partially immersed in a plating solution; the diameter of cylindrical cross-sectional circles at both ends of the conductive roller (121) is d1; the maximum diameter of the middle section of the conductive roller (121) is d2, and d2 is smaller than d1; the conductive roller (121) is partially immersed in the plating solution, and the conductive roller (121) is configured to enable the middle of the conductive roller (121) not to be in contact with the plating solution and likewise not to be in contact with the middle of a film-plated product (200) during an electroplating process. When the film-plated product (200) passes through the conductive mechanisms (120), one surface of the film-plated product (200) is in contact with one of the two conductive rollers (121), and the other surface of the film-plated product (200) is in contact with the other conductive roller (121).
The present invention relates to a flexible substrate coating device and coating method. The flexible substrate coating device comprises a vacuum chamber, a partition plate, an unwinding roller, a heating member, a coating roller, a plating member and a winding roller. The partition plate is located in the vacuum chamber and used for dividing the vacuum chamber into a heating chamber and a coating chamber; the partition plate is provided with a first through hole and a second through hole, the first through hole is used for a substrate to be conveyed from the heating chamber to the coating chamber, and the second through hole is used for the substrate to be conveyed from the coating chamber to the heating chamber. The unwinding roller, the heating member and the winding roller are located in the heating chamber, the unwinding roller is used for unwinding the substrate, the heating member is used for heating the substrate in the heating chamber, and the winding roller is used for winding the substrate. The coating roller and the plating member are located in the coating chamber, and the plating member is close to the coating roller and used for plating the substrate on the surface of the coating roller, thereby forming a thin film coating on the surface of the substrate. By using the device, the adhesion, compactness and thickness uniformity of the thin film coating on the surface of the substrate can be improved.
The present invention relates to a conductive apparatus for a coating and a coating machine. The conductive apparatus for a coating comprises a rack and two conductive mechanisms. The rack is provided with a plating tank which contains a plating solution; the two conductive mechanisms are both fixed on the rack and arranged opposite to each other at an interval along the depth direction of the plating tank, and the conductive mechanisms comprise conductive rollers, titanium baskets and rectifiers; positive electrodes of the rectifiers are electrically connected to the titanium baskets, negative electrodes of the rectifiers are electrically connected to the conductive rollers, the titanium baskets are at least partially immersed in the plating solution, one side of each conductive roller in the radial direction thereof is immersed in the plating solution, the other side thereof is exposed out from the plating solution, and the cross sections of the conductive rollers in the axial direction thereof are "工" shaped; when the coated product passes through the conductive mechanisms, one surface of the coated product is in contact with one of the two conductive rollers, and the other surface of the coated product is in contact with the other conductive roller. The conductive apparatus for a coating provided by the present invention may prevent the middle part of the conductive rollers from coming into contact with the plating solution during the electroplating process of the coated product, thereby remarkably improving the coating quality of the coated product.
The present invention relates to the technical field of membrane materials, and particularly to a polyphenol-modified polymeric membrane, a preparation method therefor and a metallized polymeric membrane. According to the present invention, corona treatment is carried out on the surface of a polymeric layer, so that a polar modification liquid can uniformly coat the surface of the polymeric layer, thereby forming a modification layer closely combined with the polymeric layer, which imparts a relatively high level of lasting polarity to the surface of the polymeric layer with low polarity, so that the polymeric layer can be stably and closely combined with a layer of a material with high polarity and high surface tension such as a metallic layer for a long period of time, and thus the range of applications for non-polar polymeric substrate layers is effectively broadened; the concentration of the polyphenol and crosslinking agent in the modification liquid is controlled to allow the modification layer formed by crosslinking reactions to have a suitable crosslinking density and an adequate number of hydroxyl groups, so that the long-term polarity and surface tension of the polymeric layer can be increased more effectively and stably. The treatment process of the preparation method is simple, relatively cheap, efficient, and easy to scale up.
The present invention relates to the technical field of new materials, in particular to a low-energy consumption method for preparing a composite current collector. In the present invention, by using certain parts by mass of copper hydroxyphosphate, copper dichromate and a high molecular polymer as a surface layer raw material of a composite current collector base material, for a composite current collector base material prepared by co-extrusion with a core layer material, under the irradiation of ultraviolet light, divalent copper ions in part of the copper hydroxyphosphate and copper dichromate are reduced to elemental copper, and a nano-copper layer is grown; and another part of the copper hydroxyphosphate and copper dichromate is activated, and seed crystals that are catalytically active for electroless copper plating are formed. The nano-copper layer and the seed crystals cooperate and can achieve the square resistance required by electroless plating or electroplating, replacing a physical vapor deposition step for preparing a composite current collector in the traditional technology, thus effectively reducing energy consumption and production costs, and improving production efficiency. Moreover, ultraviolet light treatment does not cause damage to the high molecular material, and does not affect the physical strength and performance thereof, thereby also improving the product yield rate.
222 -, forming a nano-scale copper layer on the surface of the polymer film, so that a certain sheet resistance is achieved, and subsequent chemical plating or electroplating can be performed, thereby replacing physical vapor deposition steps in the prior art of preparing a composite current collector, effectively reducing energy consumption and the production costs, and improving the production efficiency.
The present application relates to the technical field of new materials, in particular to a method for preparing a composite current collector with low energy consumption. In the present application, according to certain parts by mass, a first copper-containing photosensitive material, a second copper-containing photosensitive material, and a high-molecular polymer are used as surface layer raw materials of a composite current collector base material, the surface layer raw materials and a core layer raw material are subjected to co-extrusion to prepare the composite current collector base material, under the irradiation of ultraviolet light, bivalent copper ions in a part of the copper-containing photosensitive material are reduced into copper, and a nanoscale copper layer is grown; and the other part of the copper-containing photosensitive material is activated to form a seed crystal having chemical copper plating catalytic activity. The nano copper layer and the seed crystal have a synergistic effect, so that the sheet resistance required by chemical plating or electroplating can be achieved, a physical vapor deposition step of preparing the composite current collector in a traditional technology is replaced, energy consumption and production costs are effectively reduced, and production efficiency is improved. Moreover, ultraviolet light treatment does not cause damage to the high-molecular material, and the physical strength and performance thereof are not affected, so that a product yield is also improved.
The present invention relates to the technical field of film materials, in particular to a modified polymer film and a preparation method therefor, and a metallized polymer film and the use thereof. By carrying out corona treatment on the surface of a polymer layer of polyethylene, polypropylene or polyethylene glycol terephthalate, a polarity modifier can be uniformly coated on a surface of a polymer layer to form a modified layer tightly combined with the polymer layer, so that a surface of a low-polarity polymer layer is endowed with a lasting high polarity and correspondingly high surface tension, and thus can stably and tightly combine with a metal layer and other high-polarity high-surface-tension material layers for a long time, effectively expanding usage scenarios of a non-polar polymer substrate layer. The preparation method features a simple and feasible treatment process, low cost, high treatment efficiency and easy expansion. The surface tension of a prepared modified polymer film can reach 68 mN/m, and does not show obvious reduction after the film is placed for three months.
The present invention relates to the technical field of film materials, and specifically relates to a modified polymer film and a preparation method therefor, and a metallized polymer film and the use. By subjecting the surface of a polymer layer, such as polyethylene, polypropylene and polyethylene terephthalate, to a corona treatment, the surface of the polymer layer can be uniformly coated with a polar modifier so as to form a modified layer tightly combined with the polymer layer, such that the surface of the low-polarity polymer layer is endowed with lasting and relatively high polarity and correspondingly has relatively high surface tension, so that the low-polarity polymer layer can be stably and tightly combined with a high-polarity and high-surface-tension material layer, such as a metal layer, for a long time, and the usage scenarios of a non-polar polymer substrate layer are effectively widened. The preparation method has a simple and feasible treatment process, a relatively low cost, and high treatment efficiency, and is easily amplified. The surface tension of the prepared modified polymer film can reach up to 68 mN/m, and does not significantly reduce after the modified polymer film is laid aside for three months.
The present invention relates to a continuous coating system, a continuous coating production line, and a continuous coating method. The continuous coating system comprises: an unwinding device capable of accommodating and conveying a thin film, and capable of adjusting a speed of conveying the thin film; a chemical coating pool used for storing a coating liquid so as to coat, by using a chemical coating method, the thin film conveyed by the unwinding device; an electroplating coating pool used for storing the coating liquid so as to coat, by using an electroplating method, the thin film coated by the chemical coating method; and a winding device capable of conveying the thin film at a constant speed and accommodating the thin film. When the thin film needs to be coated, the thin film is removed from the unwinding device and accommodated in the unwinding device. It can be understood that the thin film is pre-leveled by the unwinding device and the winding device. When the thin film sequentially passes through the chemical coating pool and the electroplating coating pool, the coating liquid in the coating pools can be uniformly attached to the thin film, such that the thickness of a coating layer of the thin film is increased, thereby solving the problem that in the existing solution of increasing the thickness of the coating layer of the thin film in an electroplating manner, the thin film is prone to hole burning, perforation, film breakage or the like.
C23C 18/16 - Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, i.e. electroless plating
C23C 18/20 - Pretreatment of the material to be coated of organic surfaces, e.g. resins
C23C 18/40 - Coating with copper using reducing agents
The present invention relates to a coating system and a coating production line. The coating system comprises: an unwinding apparatus capable of accommodating and conveying at a constant speed a thin film; a coating pool disposed at an output side of the unwinding apparatus and used to store coating liquid, so as to carry out coating on the thin film conveyed by the unwinding device; a spraying apparatus capable of cleaning the thin film coated by the coating pool; a drying apparatus used to dry the thin film cleaned by the spraying apparatus; and a winding apparatus disposed at an output side of the drying apparatus and capable of conveying at a constant speed and accommodating the thin film processed by the drying apparatus. When a thin film needs to be coated, the thin film is moved out from the unwinding apparatus and is accommodated in the unwinding apparatus. It can be understood that the thin film is pre-leveled by the unwinding apparatus and the winding apparatus. When the thin film passes through the coating pool at a constant speed, the coating liquid of the coating pool can be uniformly attached to the thin film, so that the thickness of the coating layer of the thin film is increased. By means of controlling the speed at which the thin film is conveyed by the unwinding apparatus, the thickness of a coating layer on thin film can be increased.
C23C 18/16 - Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, i.e. electroless plating
C23C 18/20 - Pretreatment of the material to be coated of organic surfaces, e.g. resins
C23C 18/40 - Coating with copper using reducing agents
59.
COMPOSITE CURRENT COLLECTOR, MANUFACTURING METHOD, ELECTRODE SHEET AND LITHIUM BATTERY
The present invention relates to a composite current collector, a manufacturing method, an electrode sheet and a lithium battery. The composite current collector comprises: a first porous conductive sheet, a substrate sheet and a second porous conductive sheet which are sequentially stacked. Pores on the first porous conductive sheet and the second porous conductive sheet are micropores and are uniformly distributed; the substrate sheet is made of a polymer insulating material; the first porous conductive sheet and the second porous conductive sheet are connected in a tab area. Micropores are formed on the surfaces of the first porous conductive sheet and the second porous conductive sheet, so that a better adsorption force can be provided for an active material. Second, due to the fact that the micropores of the first porous conductive sheet and the second porous conductive sheet are uniformly distributed, on one hand, the active material can be uniformly distributed when the active material is attached to the first porous conductive sheet and the second porous conductive sheet, and the formation of a lithium dendrite is well avoided; on the other hand, the composite current collector has a better buffer effect. Finally, a substrate sheet can provide a good supporting effect by adopting the polymer insulating material, so as to prevent deformation of the first porous conductive sheet and the second porous conductive sheet and also insulate the active material.
ADDITIVE FOR COPPER PLATING SOLUTION, COPPER PLATING SOLUTION, COPPER-PLATED THIN FILM AND PREPARATION METHOD THEREFOR, NEGATIVE ELECTRODE CURRENT COLLECTOR, AND LITHIUM BATTERY
The present invention relates to the technical field of the metal plating of thin films, in particular to an additive for a copper plating solution, a copper plating solution, a copper-plated thin film and a preparation method therefor, a negative electrode current collector, and a lithium battery. The additive for a copper plating solution comprises sodium pyrrolidinedithiocarbamate, benzyltriphenylphosphonium bromide and 2-(hydroxymethyl)thiophene at a mass ratio of (0.8-1.2) : (1.6-2.4) : (2.4-3.6). The additive for a copper plating solution can, on the basis of not influencing the performance of an original chemical copper plating process, completely overcome the defect that needle-point-shaped through holes are prone to occurring in a copper-plated thin film, can guarantee the compactness and continuity of the copper-plated thin film, and can achieve the effect of reducing the film surface sheet resistance.
Disclosed herein is a composite current collector, a manufacturing method thereof, an electrode and a lithium-ion battery comprising the composite current collector. The composite current collector comprises: a first porous conductive sheet, a substrate sheet, and a second porous conductive sheet that are laminated in sequence, and the first porous conductive sheet and the second porous conductive sheet comprise amorphous micropores throughout the porous conductive sheets, the substrate sheet is made of a high molecular non-conductive material, and the first porous conductive sheet and the second porous conductive sheet are in conduction with each other in the electrode tab area.
patents