The present invention discloses a method of preparing a hard carbon anode material and use thereof. Starch is mixed with nano-silica, the obtained mixture is heat treated at 150° C. to 240° C. under an inert atmosphere, the obtained first-sintered product is heat treated at 180° C. to 220° C. under an oxygen-containing atmosphere, the second-sintered product is cyclonically separated to remove nano-silica to obtain pre-oxidized starch-based microspheres, and the pre-oxidized starch-based microspheres are performed carbonization treatment under an inert atmosphere to obtain the hard carbon anode material. In the present invention, the silica particles can be adsorbed on the surface of the starch raw material, and cross-linking occurs between the starch molecular chains during the heat treatment process, and under the barrier of the silicon dioxide, the starch particles will not be cross-linked but fused to form a spherical structure. The introduction of oxygen atoms during the pre-oxidation process produces oxygen vacancy and increases the active sites for sodium ion storage after carbonization, thus increasing the reversible capacity of sodium ion batteries.
Disclosed is a method for short-range recovery of a valuable metal from a waste ternary lithium battery. By means of the steps of nickel and cobalt precipitation by a two-stage chemical precipitation method and trisodium phosphate-based lithium precipitation, the problem in the prior art of high content of impurities in lithium carbonate is solved and high-quality lithium carbonate is obtained; in addition, the whole process is carried out in a normal pressure environment. Compared with the complex process of recovering nickel, cobalt, and manganese metals by an extraction + MVR evaporative crystallization method and recovering a lithium metal after MVR concentration, the demand of a waste ternary lithium battery recovery process for energy consumption and the pollution of the waste ternary lithium battery recovery process to the environment are greatly reduced, and industrial production is facilitated.
Disclosed are a preparation method for high-performance lithium iron phosphate and use thereof. The method comprises the following steps: dispersing a lithium salt into a solvent A, and adding an organic acid to adjust the pH to obtain a mixed solution; dispersing porous iron phosphate into a solvent B, and adding an organic carbon source to obtain a mixed slurry A; adding the mixed slurry A into the mixed solution; grinding the obtained slurry; adding a dispersing agent into the grinding material for stirring and dispersing to obtain a mixed slurry B; placing the mixed slurry B under the pressure of 100-1000 Pa for aging and drying; and sintering the obtained dry material in an inert atmosphere to obtain lithium iron phosphate.
C04B 35/447 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on phosphates
C04B 35/626 - Preparing or treating the powders individually or as batches
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
4.
CONTINUOUS SELECTIVE LEACHING PROCESS, LEACHING APPARATUS AND TWO-STAGE LEACHING DEVICE FOR CRUDE COBALT HYDROXIDE, AND PRODUCTION PROCESS AND PRODUCTION SYSTEM FOR COBALT PRODUCT
Provided herein is a continuous selective leaching process for crude cobalt hydroxide. The continuous selective leaching process comprises the following steps: preparing a crude cobalt hydroxide slurry; mixing some of the crude cobalt hydroxide slurry with an acid solution until the crude cobalt hydroxide slurry is dissolved in the acid solution, so as to obtain a primary leachate; adding the rest of the crude cobalt hydroxide slurry to the primary leachate, and mixing same, so as to obtain an adjusted leachate; subjecting the adjusted leachate to a selective precipitation operation, so as to form a precipitate and a selective leachate; and subjecting the precipitate and the selective leachate to a solid-liquid separation operation, so as to respectively obtain a first-stage leachate and acid leaching residues.
32231232231212 in pore channels of the mesoporous template; and removing the template. The mesoporous material prepared by using the method has a relatively high specific surface area, and can be used as a fast ion conductor in a Prussian blue analogue positive electrode material, so as to achieve the effects of improving the conductivity of the Prussian blue analogue positive electrode material and reducing side reactions caused by contact of the material with an electrolyte. A battery further prepared from the Prussian blue analogue positive electrode material has good conductivity, rate performance and cycling performance.
H01M 4/62 - Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
H01M 4/36 - Selection of substances as active materials, active masses, active liquids
H01M 4/58 - Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFySelection of substances as active materials, active masses, active liquids of polyanionic structures, e.g. phosphates, silicates or borates
H01M 10/054 - Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
6.
Method for recovering waste lithium cobalt oxide battery
Disclosed is a method for recovering a waste lithium cobalt oxide battery, the method comprising: feeding a lithium cobalt oxide battery black powder in a column-shaped container, adding a first acid to the column-shaped container for heat leaching until solids in the column-shaped container are not reduced any more so as to obtain a first leachate and leaching residues, wherein the first acid is a weak acid, and a filtering structure is arranged at the bottom of the column-shaped container; and adding a second acid to the column-shaped container containing the leaching residues for heat leaching until solids in the column-shaped container are not reduced any more so as to obtain a second leachate and graphite, wherein the second acid is a strong acid.
The present disclosure discloses a preparation method of a tin-based lithium cobaltate precursor and use thereof. The method involves adding a cobalt salt solution, a precipitant and a complexing agent for reaction to obtain a precipitate, wherein the precipitant is a mixed solution of carbonate and stannate; calcining the precipitate; and mixing the calcined material with dioxane, ball-milling the mixture, and subjecting the ball-milled product to a heating and pressurization treatment to obtain the tin-based lithium cobaltate precursor. In the present disclosure, after carbonate and stannate are blended, the blend react with cobalt salt to form the co-precipitate of cobalt carbonate and cobalt stannate, and after calcination, a mixture of cobalt(II,III) oxide and tin dioxide is formed. By utilizing dioxane for solvent hot pressing, particles are bonded to each other, forming grain boundary channels. In addition, by doping with tin, the conductivity of the material is improved.
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
A preparation method of a ferrous lithium phosphate material includes the following steps: (1) mixing zinc source, copper source and complexing agent solution, then mixing with iron source and phosphoric acid source, evaporating and dehydrating to obtain a jelly, and then primary sintering the jelly under a protective atmosphere to obtain a solid-phase material; and (2) mixing the solid-phase material prepared in step (1) with a lithium source, grinding and secondary sintering under a protective atmosphere to obtain the ferrous lithium phosphate material.
C01B 25/45 - Phosphates containing plural metal, or metal and ammonium
H01M 4/58 - Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFySelection of substances as active materials, active masses, active liquids of polyanionic structures, e.g. phosphates, silicates or borates
9.
METHOD FOR PREPARING SEMI-HYDRATED GYPSUM POWDER BY DYNAMICALLY ROASTING PURIFIED ARDEALITE
The present invention provides a method for preparing a semi-hydrated gypsum powder by dynamically roasting purified ardealite, and relates to the technical field of waste recovery. The method uses a dynamic roasting device to carry out dynamic roasting, and comprises the following steps: feeding purified ardealite into a thoroughly preheated dynamic roasting device from a feed port; adjusting a drying reaction gas introduced into a drying reaction section until the temperature of the drying reaction section is 180-220°C, and reacting same for 10-30 min to remove free water; adjusting a roasting reaction gas introduced into a roasting reaction section until the temperature of the roasting reaction section is 120-160°C, and reacting same for 30-60 min to remove half of the crystal water; and then adjusting a cooling reaction gas introduced into a cooling reaction section until the temperature of the cooling reaction section is 60-120°C, and reacting same for 15-30 min to cool the gypsum, thereby preparing a semi-hydrated gypsum powder. In the present invention, a coordinated regulation mechanism for efficiently drying and dewatering ardealite can be established, energy consumption can be reduced, and the pass rate of semi-hydrated gypsum products can be increased.
A method for recycling and preparing a positive electrode material from waste lithium iron phosphate batteries. The method comprises the following steps: discharging, crushing, and stripping waste lithium iron phosphate batteries to obtain black powder; then mixing the black powder with benzenesulfonate, and reacting in a fluidized bed; and then adding an acid and an alkali to remove impurities, finally adding a lithium supplement, an iron supplement, or a phosphate, and a reducing agent, and sintering. According to the method, by controlling and optimizing the crushing, stripping, carbon and fluorine removal, and impurity removal processes, a positive electrode material with high purity can be recycled while controlling the recycling cost, and batteries prepared by means of the recycled positive electrode material have good performance.
H01M 10/54 - Reclaiming serviceable parts of waste accumulators
C01B 25/45 - Phosphates containing plural metal, or metal and ammonium
H01M 4/02 - Electrodes composed of, or comprising, active material
H01M 4/58 - Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFySelection of substances as active materials, active masses, active liquids of polyanionic structures, e.g. phosphates, silicates or borates
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
11.
PREPARATION METHOD FOR HARD CARBON NEGATIVE ELECTRODE MATERIAL, AND USE OF PREPARATION METHOD
Disclosed are a preparation method for a hard carbon negative electrode material, and a use of the preparation method. The method comprises: mixing starch and nano silicon dioxide, and performing heat treatment on an obtained mixed material at 150-240°C under an inert atmosphere; performing heat treatment on an obtained primary sintering product at 180-220°C under an oxide-containing atmosphere; performing cyclone separation on an obtained secondary sintering product to remove nano silicon dioxide to obtain pre-oxidized starch-based microspheres; and performing carbonization treatment on the pre-oxidized starch-based microspheres under the inert atmosphere to obtain the hard carbon negative electrode material. The silicon dioxide particles of the present invention can be adsorbed on the surface of a starch raw material; in the heat treatment process, starch molecular chains are cross-linked; under the blocking of silicon dioxide, starch particles are not cross-linked and fused, and a spherical structure is formed; and in the pre-oxidation process, oxygen vacancies generated after introduced oxygen atoms are carbonized increase active sites for sodium ion storage, thereby improving the reversible capacity of a sodium-ion battery.
Disclosed are a preparation method for and use of high-performance lithium iron phosphate. The method comprises the following steps: dispersing a lithium salt into a solvent A, and adding an organic acid to adjust the pH to obtain a mixed solution; dispersing porous iron phosphate into a solvent B, and adding an organic carbon source to obtain a mixed slurry A; adding the mixed slurry A into the mixed solution; grinding the obtained slurry; adding a dispersing agent into the grinding material for stirring and dispersing to obtain a mixed slurry B; placing the mixed slurry B under the pressure of 100-1000 Pa for aging and drying; and sintering the obtained dry material in an inert atmosphere to obtain lithium iron phosphate. According to the present invention, the lithium salt and the organic carbon source are stably embedded into the porous iron phosphate structure, so that the reaction is more effective and complete, the generation of impurity phases in the finished product is reduced, and the prepared product has a more uniform and rounded particle morphology, more excellent electrochemical performance, and long cycle performance.
C01B 25/45 - Phosphates containing plural metal, or metal and ammonium
H01M 4/58 - Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFySelection of substances as active materials, active masses, active liquids of polyanionic structures, e.g. phosphates, silicates or borates
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
13.
PREPARATION METHOD FOR TIN-BASED LITHIUM COBALT OXIDE PRECURSOR, AND APPLICATION OF PRECURSOR
Disclosed in the present invention are a preparation method for a tin-based lithium cobalt oxide precursor, and an application of the precursor. The preparation method comprises: adding a cobalt salt solution, a precipitant and a complexing agent for reaction to obtain a precipitate, wherein the precipitant is a mixed solution of carbonate and stannate; calcining the precipitate; mixing the calcined material with dioxane, and performing ball milling; and heating and pressurizing the ball-milled product to obtain the tin-based lithium cobalt oxide precursor. In the present invention, by mixing carbonate and stannate with a cobalt salt, a coprecipitate of cobalt carbonate and cobalt stannate is genereated; a mixture of cobaltosic oxide and tin dioxide is formed after calcination; the dioxane is used to perform solvent hot pressing, so that particles are linked with each other, and a grain boundary channel is formed, thereby improving the conductivity of a material while tin is doped.
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
14.
PREPARATION METHOD FOR SEA URCHIN-LIKE LITHIUM COBALTATE AND APPLICATION OF SEA URCHIN-LIKE LITHIUM COBALTATE
Disclosed in the present invention are a preparation method for sea urchin-like lithium cobaltate and an application of sea urchin-like lithium cobaltate. The method comprises: mixing a cobalt salt, ammonium fluoride, urea, an oxidant, and water to obtain a mixed solution; heating the mixed solution for a reaction; roasting the obtained solid in an oxygen-containing atmosphere; and roasting the roasted material and a lithium source to obtain lithium cobaltate. The lithium cobaltate prepared by the method forms a sea urchin-like porous structure, thereby increasing a contact area between an electrolyte and an electrode active material, increasing active sites for lithium ion deintercalation, greatly facilitating the infiltration and permeation of the electrolyte and the transport of lithium ions, and achieving good rate characteristics and cycling stability.
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
15.
LITHIUM IRON PHOSPHATE MATERIAL AND PREPARATION METHOD THEREFOR
The present invention discloses a preparation method for a lithium iron phosphate material. The preparation method comprises the following steps: (1) mixing a zinc source, a copper source and a complexing agent solution, then mixing same with an iron source and a phosphoric acid source, subjecting the resulting mixture to evaporation and dehydration to obtain a jelly, and subjecting the jelly to primary sintering in a protective atmosphere to obtain a solid phase; and (2) mixing the solid-phase substance prepared in step (1) with a lithium source, grinding same, and subjecting same to secondary sintering in a protective atmosphere to obtain the lithium iron phosphate material. The lithium iron phosphate material prepared by using the method has a relatively good electrochemical performance, and can meet the increasingly high quality requirements of the market for electrode materials.
Disclosed in the present invention is a method for recovering a waste lithium cobalt oxide battery, the method comprising: feeding a lithium cobalt oxide battery black powder in a column-shaped container, adding a first acid to the column-shaped container for heat leaching until solids in the column-shaped container are not reduced any more so as to obtain a first leachate and leaching residues, wherein the first acid is a weak acid, and a filtering structure is arranged at the bottom of the column-shaped container; and adding a second acid to the column-shaped container containing the leaching residues for heat leaching until solids in the column-shaped container are not reduced any more so as to obtain a second leachate and graphite, wherein the second acid is a strong acid. According to the present invention, the leaching method of the battery black powder is changed, and the acid-resistant column-shaped container is selected to be used in cooperation with the first acid and the second acid to perform selective heat leaching for leaching, such that on the one hand, consumption of an inorganic strong acid can be reduced, emission of strong acid gas is reduced, and green and low-carbon heat leaching of the black powder is achieved; and on the other hand, the column-shaped container having a filtering structure is used, such that the acid consumption can be saved.
A method for recycling and preparing a positive electrode material from waste lithium iron phosphate batteries. The method comprises the following steps: discharging, crushing, and stripping waste lithium iron phosphate batteries to obtain black powder; then mixing the black powder with benzenesulfonate, and reacting in a fluidized bed; and then adding an acid and an alkali to remove impurities, finally adding a lithium supplement, an iron supplement, or a phosphate, and a reducing agent, and sintering. According to the method, by controlling and optimizing the crushing, stripping, carbon and fluorine removal, and impurity removal processes, a positive electrode material with high purity can be recycled while controlling the recycling cost, and batteries prepared by means of the recycled positive electrode material have good performance. According to the method, the contents of aluminum, copper, carbon, and fluorine in the black powder can be effectively reduced; moreover, when regenerating a positive electrode material, there is only a need to supplement iron or lithium and carry out carbothermic reduction.
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