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Negative electrode material of lithium battery and preparation method and application thereof

A technology of negative electrode material and electrode material, applied in the field of negative electrode material of lithium battery and its preparation, can solve the problems of inability to meet energy demand, low specific capacity, etc., to improve battery cycle efficiency, improve electrical conductivity and conductivity, and shorten path Effect

Inactive Publication Date: 2019-02-19
CHONGQING LIHONG FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low specific capacity of commercialized graphite anode materials can no longer meet people's growing energy demand, especially in the electric vehicle industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 912g of graphite, 19g of conductive agent, 9.5g of carboxymethylcellulose lithium (CMC-Li), 9.5g of styrene-butadiene latex (SBR), and 1.5L of deionized water. Add lithium carboxymethyl cellulose to water, stir until completely dissolved; then add conductive agent, stir for 1 hour to mix; then add graphite, stir to disperse, and vacuumize to remove air bubbles in the water, vacuum degree ≤ -0.01KPa, until there are no air bubbles Finally, add styrene-butadiene latex, stir for 1 hour and mix until viscous to obtain the negative electrode material. The negative electrode material is dispersed into particles through a sieve, which is used to prepare the negative electrode sheet of the lithium battery.

[0030]According to the applicant's test, the lithium battery prepared by using this negative electrode material has a specific charge and discharge capacity of 400mAh / g for the first time, and a capacity retention rate of 97.9% after 100 cycles. The same formula does n...

Embodiment 2

[0032] Take 893g of graphite, 19g of conductive agent, 14.25g of carboxymethylcellulose lithium (CMC-Li), 23.75g of styrene-butadiene latex (SBR), and 1.5L of deionized water. Add lithium carboxymethyl cellulose to water, stir until completely dissolved; then add conductive agent, stir for 1 hour to mix; then add graphite, stir to disperse, and vacuumize to remove air bubbles in the water, vacuum degree ≤ -0.01KPa, until there are no air bubbles Finally, add styrene-butadiene latex, stir for 1 hour until viscous, and obtain the negative electrode material. The negative electrode material is dispersed into particles through a sieve, which is used to prepare the negative electrode sheet of the lithium battery.

[0033] According to the applicant's test, the first charge-discharge specific capacity of the lithium battery prepared by using this negative electrode material reaches 420mAh / g, and the capacity retention rate of 100 cycles is 98.3%. The same formula does not contain car...

Embodiment 3

[0035] Take 798g of graphite, 38g of conductive agent, 28.5g of carboxymethylcellulose lithium (CMC-Li), 85.5g of styrene-butadiene latex (SBR), and 1.3L of deionized water. Add lithium carboxymethyl cellulose to water, stir until completely dissolved; then add conductive agent, stir for 1 hour to mix; then add graphite, stir to disperse, and vacuumize to remove air bubbles in the water, vacuum degree ≤ -0.01KPa, until there are no air bubbles Finally, add styrene-butadiene latex, stir for 1 hour until viscous, and obtain the negative electrode material. The negative electrode material is dispersed into particles through a sieve, which is used to prepare the negative electrode sheet of the lithium battery.

[0036] Through the test of the applicant, the first charge-discharge specific capacity of the lithium battery prepared by this negative electrode material reaches 397mAh / g, and the capacity retention rate of 100 cycles is 96.4%. The same formula does not contain carboxymeth...

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PUM

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Abstract

The invention provides a negative electrode material of a lithium battery. The material comprises 80-90 wt% of graphite, 0.5-6 wt% of a conductive agent, 0.5-6 wt% of carboxymethylcellulose lithium and 1-10 wt% of styrene-butadiene latex. When the negative electrode material is used as a negative electrode of the lithium battery, Li ions can be additionally provided for the lithium battery, the dispersing control efficiency of the lithium ions is improved, the embedding and releasing number of the lithium ions between a positive electrode and the negative electrode is improved, the lithium ionmoving route between the positive and negative electrodes is shortened, so that the conductive rate and transmission rate between the positive and negative electrodes are effectively improved, and the lithium battery which adopts the negative electrode material as the negative electrode has higher specific capacity and circulation efficiency.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a negative electrode material of a lithium battery, a preparation method and application thereof. Background technique [0002] With the rapid development of the economy and the increasing demand of people, on the one hand, various electrical appliances and electric products are increasing, and the demand for batteries is also increasing. On the other hand, my country is facing huge environmental pressure and energy problems. Therefore, how to achieve environmental protection while ensuring normal production and life has become the focus of research. [0003] Lithium-ion batteries have the characteristics of high energy density, long cycle life and no pollution, so they are widely used in various electrical appliances and electric equipment. However, the low specific capacity of graphite anode materials that have been commercialized can no longer meet people's increasing energy d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/052
CPCH01M4/36H01M4/621H01M4/624H01M10/052Y02E60/10
Inventor 夏银凤张长青陈静黄礼荣张菁刘为旺谢莹张成菊
Owner CHONGQING LIHONG FINE CHEM
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