Abstract

A method for preparing a high-purity metal lithium by a vacuum thermal reduction method includes the following steps: obtaining Li2O.(2-x)CaO by carrying a vacuum thermal decomposition process on a lithium-containing raw material in the presence of a refractory agent and a catalyst; mixing the obtained oxide with the fluxing agent, the catalyst and a reducing agent according to a certain ratio, and then briquetting; carrying out vacuum thermal reduction in a vacuum reduction furnace, and performing centrifugal sedimentation and micron ceramic dust removal on lithium vapor obtained by the thermal reduction to obtain a high-purity metal gas; and removing metal impurities from the gas by controlling a condensation temperature and a condensation speed of the gas so as to purify the lithium vapor, and obtaining a high-purity metal lithium with a rapid cooling technology.

IPC Classes  ?

• C22B 26/12 - Obtaining lithium
• C22B 1/24 - BindingBriquetting
• C22B 5/04 - Dry processes by aluminium, other metals, or silicon
• C22B 5/16 - Dry processes with volatilisation or condensation of the metal being produced

Abstract

The present invention belongs to the technical field of preparation of light metal alloy materials, in particular to a method for producing a magnesium-lithium alloy by a gaseous co-condensation method. The method comprises the steps of: 1) mixing and briquetting a lithium salt, a refractory agent and a catalyst under pressure, and then thermally decomposing to form an unsaturated composite oxide; 2) respectively crushing and ball-milling, and then briquetting the unsaturated composite oxide, magnesium oxide, a reducing agent and a fluxing agent; 3) reducing briquettes in vacuum; 4) making a gas pass through a first condensing chamber of a temperature control device, and then purifying; 5) The purified metal gas is condensed into the condensing phase of the alloy through the second condensing chamber of a quenching device; 6) obtaining the magnesium-lithium alloy with a purity being 99.5% or above by virtue of smelting and flux-refining, and then purifying by distillation. The magnesium-lithium alloy obtained in the present application is not segregated, so that a stable β-phase solid solution or a compound having an increasing purity being 99.95% is formed.

IPC Classes  ?

• C22B 26/12 - Obtaining lithium
• B01D 5/00 - Condensation of vapoursRecovering volatile solvents by condensation
• B22F 9/20 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from solid metal compounds
• C22B 5/04 - Dry processes by aluminium, other metals, or silicon
• C22B 9/04 - Refining by applying a vacuum
• C22B 26/22 - Obtaining magnesium

Abstract

A nickel-manganese-based positive electrode material precursor and a synthesis method for a positive electrode material thereof. The synthesis method comprises the steps of: 1) adding a soluble T salt, a soluble nickel salt and a soluble manganese salt into deionized water, and preparing a metal salt solution in proportion; 2) preparing a precipitant solution from sodium hydroxide, potassium hydroxide or lithium hydroxide; and 3) adding pure water, metal powder or metal oxide into a precipitation reactor, then respectively heating the metal salt solution and the precipitant solution, and then adding into the precipitation reactor for coprecipitation reaction, and filtering the reaction product while hot; and finally, stirring and washing the filtered precipitate with deionized water, and carrying out vacuum drying treatment to obtain the nickel-manganese-based positive electrode material precursor. The precursor and a lithium source are mixed, pre-roasted and calcined at high temperature, the prepared positive electrode material is perfect in layered structure, good in crystallization degree and stable in electrochemical performance, and the charge-discharge capacity of the positive electrode material reaches 200 mAh/g or above.

IPC Classes  ?

• C01G 53/00 - Compounds of nickel
• H01M 4/485 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
• H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• 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

Abstract

A method for preparing highly pure metallic lithium by vacuum thermal reduction, comprising the following steps: performing vacuum thermal degradation on a lithium-containing raw material in the presence of a flux inhibitor and a catalyst to obtain an unsaturated composite oxide; and then mixing the unsaturated composite oxide with a fluxing agent and a reducing agent at specific proportions and briquetting, carrying out vacuum thermal reduction in a vacuum reduction furnace, performing centrifugal sedimentation and micro-ceramic dust removal on the obtained lithium vapor to obtain a highly pure metal gas, controlling a condensation temperature and a condensation speed of the gas to remove metal impurities from the gas so as to purify the lithium vapor, and applying a rapid cooling technique to obtain highly pure metallic lithium.

IPC Classes  ?

• C22B 5/04 - Dry processes by aluminium, other metals, or silicon
• C22B 1/24 - BindingBriquetting
• C22B 5/16 - Dry processes with volatilisation or condensation of the metal being produced

Abstract

Disclosed is a method for producing a magnesium-lithium alloy by means of gaseous co-condensation, the method comprising step 1) mixing a lithium salt, a melting inhibitor and a catalyst, then pressure-pelletizing same, and subjecting same to thermal decomposition to form an unsaturated composite oxide; 2) respectively crushing the unsaturated composite oxide, magnesium oxide, a reducing agent and a fluxing agent, ball-milling same and then pelletizing same; 3) reducing the pellets in a vacuum; 4) passing a gas through a first condensation chamber (3) of a temperature-controlling device, and purifying same; 5) passing the purified pure metal gas through a second condensation chamber (4) of a quenching device to condense same into a condensed phase of an alloy; and 6) smelting and flux-refining same to obtain a magnesium-lithium alloy with a purity of 99.5% or more, and finally subjecting same to distillation purification. The magnesium-lithium alloy obtained by means of the method does not segregate, and forms a stable β-phase solid solution or compound, with an increased purity reaching 99.95%.

IPC Classes  ?

• B22F 9/20 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from solid metal compounds