Abrégé

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.

Classes IPC  ?

• C22B 26/12 - Obtention du lithium
• C22B 1/24 - AgglutinationBriquetage
• C22B 5/04 - Procédés généraux de réduction appliqués aux métaux par voie sèche par l'aluminium, d'autres métaux ou le silicium
• C22B 5/16 - Procédés généraux de réduction appliqués aux métaux par voie sèche avec volatilisation ou condensation du métal produit

Abrégé

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.

Classes IPC  ?

• C22B 26/12 - Obtention du lithium
• B01D 5/00 - Condensation de vapeursRécupération de solvants volatils par condensation
• B22F 9/20 - Fabrication des poudres métalliques ou de leurs suspensionsAppareils ou dispositifs spécialement adaptés à cet effet par un procédé chimique avec réduction de mélanges métalliques à partir de mélanges métalliques solides
• C22B 5/04 - Procédés généraux de réduction appliqués aux métaux par voie sèche par l'aluminium, d'autres métaux ou le silicium
• C22B 9/04 - Affinage par traitement sous vide
• C22B 26/22 - Obtention du magnésium

Abrégé

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.

Classes IPC  ?

• C01G 53/00 - Composés du nickel
• H01M 4/485 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques d'oxydes ou d'hydroxydes mixtes pour insérer ou intercaler des métaux légers, p. ex. LiTi2O4 ou LiTi2OxFy
• H01M 4/505 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de manganèse d'oxydes ou d'hydroxydes mixtes contenant du manganèse pour insérer ou intercaler des métaux légers, p. ex. LiMn2O4 ou LiMn2OxFy
• H01M 4/525 - Emploi de substances spécifiées comme matériaux actifs, masses actives, liquides actifs d'oxydes ou d'hydroxydes inorganiques de nickel, de cobalt ou de fer d'oxydes ou d'hydroxydes mixtes contenant du fer, du cobalt ou du nickel pour insérer ou intercaler des métaux légers, p. ex. LiNiO2, LiCoO2 ou LiCoOxFy
• H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium

Abrégé

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.

Classes IPC  ?

• C22B 5/04 - Procédés généraux de réduction appliqués aux métaux par voie sèche par l'aluminium, d'autres métaux ou le silicium
• C22B 1/24 - AgglutinationBriquetage
• C22B 5/16 - Procédés généraux de réduction appliqués aux métaux par voie sèche avec volatilisation ou condensation du métal produit

Abrégé

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%.

Classes IPC  ?

• B22F 9/20 - Fabrication des poudres métalliques ou de leurs suspensionsAppareils ou dispositifs spécialement adaptés à cet effet par un procédé chimique avec réduction de mélanges métalliques à partir de mélanges métalliques solides