Preparation method for lithium ferrous phosphate anode material coated by directly reduced nanocarbon

A technology of lithium ferrous phosphate and positive electrode materials, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of difficult control of nanotube growth efficiency, uneven distribution of carbon nanotubes, unstable electrochemical performance, etc. , to achieve the effects of increased discharge voltage platform, simple preparation process, and good cycle performance
CN102856548BActive Publication Date: 2014-12-10贵州唯特高新能源科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
贵州唯特高新能源科技有限公司
Publication Date
2014-12-10
Patent Text Reader

Abstract

The invention relates to a preparation method for a lithium ferrous phosphate anode material coated by directly reduced nanocarbon, which comprises the steps: mixing a reducer and water; then adding nanocarbon into the mixture of the reducer and water; obtaining the directly reduced nanocarbon by heating, ultrasonication, filtering and drying and the like; mixing the directly reduced nanocarbon with a lithium source compound, a ferrous source compound, a phosphorus source compound and a wet grinding medium, and vacuum drying to obtain dry powder; placing the dry powder in an inertial atmosphere or a reducing atmosphere, and preparing the lithium ferrous phosphate anode material coated by directly reduced nanocarbon by a two sectional sintering method. The electrode material prepared by the invention is uniform in component and excellent in discharge performance, and in particular optimal circulating performance under large current.
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Description

technical field

[0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and relates to a method for preparing a direct-reduction nano-carbon-coated lithium iron phosphate cathode material that can be used for lithium-ion batteries, lithium batteries, polymer lithium-ion batteries and supercapacitors. technical background

[0002] As a new generation of energy systems, lithium-ion batteries are widely used in electric vehicles, satellites, aerospace and military fields. Numerous studies have shown that LiFeP0 4 May become one of the most promising cathode materials for lithium-ion batteries. However, since LiFeP0 4 Due to the limitations of its own structure, the material has low electronic conductivity and poor ion conductivity, resulting in poor performance of high-rate charge and discharge, and it cannot meet the requirements of practical applications without modification. In order to overcome the shortage of lithium iron phosphat...

Claims

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