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

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.

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...

AI Technical Summary

Problems solved by technology

Due to the uneven distribution of carbon transported in the gas phase on the sample, the growth efficiency of nanotubes grown from carbon sources is difficult to control, and the grown nanotubes may not be in good contact with the lithium iron phosphate composite material, resulting in poor electrochemical performance of the prepared samples. Instability, and in the preparation of the sample, the carbon nanotubes will be unevenly distributed on the lithium iron phosphate, and there are shortcomings such as unstable batch performance of the prepared sample