Method for improving performance of anode material LiFePO4 for lithium ion cell

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as high processing costs, complicated process steps, and increased battery production costs, and achieve high electronic conductivity and good circulation Performance and Rate Capability, Effect of Excellent Li-ion Diffusion Rate
CN103259013AInactive Publication Date: 2013-08-21NANJING UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF TECH
Publication Date
2013-08-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the field of a lithium ion cell and provides a method for improving the performance of an anode material LiFePO4 for a lithium ion cell. The method comprises the specific steps of: 1. utilizing a polyhydric alcohol reduction method to prepare a pure-phase LiFePO4 material; 2. uniformly mixing the pure-phase LiFePO4 material and appropriate amount of a carbon precursor in de-ionized water; carrying out drying heat treatment in an air atmosphere at a certain temperature; and 3. carrying out high-temperature heat treatment on powder obtained by the step 2 under an inert atmosphere for a period of time to obtain the nano-grade lithium ion anode material LiFePO4 with uniform flake-shaped appearance, increasing of electron conductivity and improvement of ion diffusion rate. According to the method, the process is simple, and expensive experimental apparatuses are not needed. Intrinsic electronic conductivity and lithium ion diffusion rate of the anode material are improved obviously, so that the electrochemical performance of the anode material is obviously improved.
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Description

technical field

[0001] The invention relates to a method of improving lithium-ion battery cathode material LiFePO 4 A performance method belongs to the field of lithium ion batteries. Background technique

[0002] Currently, lithium-ion batteries are commonly used in the consumer electronics market and may play a very important role in the electric vehicle and hybrid electric vehicle market in the near future. However, there are still some technical problems to be solved before large-scale application. The application and development of lithium-ion batteries are mainly determined by its safety performance, energy density, durability and cost price. It is especially worth mentioning that choosing a Suitable cathode materials are of great significance to the performance of the entire lithium-ion battery system. In recent years, lithium iron phosphate (LiFePO 4 ) has been carefully studied by many scientific research groups due to its potential to be a cathode material for n...

Claims

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