High temperature solid state preparation method of lithium ion battery cathode material lithium metasilicate

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, silicates, secondary batteries, etc., can solve the problems of high cost, insufficient power density and energy density, etc., and achieve small grain size, good crystallization, electrical The effect of improving chemical properties
CN104022282AInactive Publication Date: 2014-09-03SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2014-09-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a high temperature solid state preparation method of a lithium ion battery cathode material lithium metasilicate. The method is as below: uniformly mixing a lithium source and a silicon source according to the molar ratio of 2: 1, and milling for 6-24 h to obtain a precursor; sintering the uniformly mixed precursor respectively in air, inert gas and a reducing atmosphere at 200-450 DEG C for 2-12 h, naturally cooling, and grinding to obtain a powdered material; and milling the powdered material for 6-24 h again, placing the powdered material into a tube furnace, sintering respectively in the air, inert gas and a reducing atmosphere at 550-1000 DEG for 4-24 h, and naturally cooling to obtain the lithium metasilicate cathode material. The invention also relates to addition of a carbon material in the preparation process to obtain a carbon coated lithium metasilicate cathode material. The invention has the advantages of simple process and easy operation. The lithium metasilicate material synthesized by the method has low intercalation potential (0.1-1 V), stable structure and excellent cycling performance.
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Description

technical field

[0001] The invention relates to a preparation method of a negative electrode material, in particular to a high-temperature solid phase preparation method of lithium metasilicate, a negative electrode material of a lithium ion battery. Background technique

[0002] Lithium-ion secondary batteries are widely used in portable micro-equipment, aerospace Aviation, power vehicles, communication power supplies, wind energy, solar energy, smart grid and other megawatt-level energy storage power stations and other fields have demonstrated broad application prospects and huge economic benefits, and have quickly become the development focus of the battery industry in various countries.

[0003] Lithium-ion batteries are developed from lithium batteries. In 1970, M.S.Whittingham of Exxon used titanium sulfide as the positive electrode material and metal lithium as the negative electrode material to make the first lithium battery. This kind of battery can also be charged...

Claims

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