Method for preparing cathode electrode material of nanometer sheet microspheric lithium ion cell

Abstract

The invention discloses a method for preparing a cathode electrode material of a nanometer sheet microspheric lithium ion cell, belonging to the field of energy sources. The method comprises the following steps of: firstly alternatively carrying out the heat treatment and the acid washing treatment on NH4FePO4 to prepare FePO4.H2O nanometer sheet microspheres with a porous structure, and reducingwith an acetonitrile solution of LiI at room temperature, finally mixing with cane sugar and sintering in vacuum at high temperature to obtain carbon-coated olivine-type LiFePO4 multilevel nanometer sheet microspheres. The method has simple process and is easy for operation, and the synthesized material has high purity, high activity, small particle diameter, narrow and small distribution; meanwhile, the high temperature treatment is short so that the shortages of larger particle diameter and wider distribution due to high temperature incineration are overcome, and the electrical conductivityand the lithium intercalation and de-intercalation stability of the LiFePO4 are effectively improved; in addition, the prepared material has the characteristics of high specific capacity, good cyclical stability and high conservation rate of high-rate discharge capacity, and is suitable to be used as the cathode electrode material of high-power lithium ion cell.

Description

technical field [0001] The invention belongs to the field of energy, in particular to a method for preparing a cathode electrode material of a nanosheet microsphere lithium ion battery, specifically a carbon-coated olivine-type LiFePO 4 The preparation method of nano-sheet microspheres with hierarchical structure. Background technique [0002] Strong energy security has become an important guarantee for the sustainable and rapid development of human society. In modern society, production, life and transportation services have become the main areas of energy consumption. At present, non-renewable mineral energy supports the operation of the world. Its non-renewability, limitation, and serious environmental problems make people's requirements for new high-energy energy more and more urgent. Lithium-ion batteries, which have been widely used in portable electronic products, have become the direction of developing new high-energy energy due to their advantages such as high ene...

AI Technical Summary

Problems solved by technology

But because of LiFePO 4 Poor electrical conductivity greatly limits the application of this cathode material in power batteries

Improved LiFePO 4 The common means of conductivity, generally by preparing LiFePO with small particle size and narrow distribution 4 Nanocrystalline and coated carbon materials, but highly crystalline LiFePO 4 It often requires heat treatment at a higher temperature (>600°C) for a long time (>8 hours), which often makes L

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