Lithium ion battery negative electrode for reducing irreversible capacity loss and preparation method of lithium ion battery negative electrode

A lithium-ion battery, capacity loss technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increasing irreversible capacity, affecting the full use of battery energy, etc., to reduce irreversible capacity loss, easy to implement, and operable strong effect

Active Publication Date: 2016-04-06
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the negative electrode of the lithium-ion battery in the prior art will increase the irreversible capacity during the first charge and discharge, which affects the full play of the b

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] A lithium ion battery negative electrode capable of reducing irreversible capacity loss, comprising a negative electrode current collector and a negative electrode slurry coated on the surface of the negative electrode current collector. The negative electrode slurry is made of the following components by mass percentage: 25% negative electrode active material, 1% conductive agent, 2% binder, 1.999% surfactant, 0.0001% lithium salt, 70% water, of which, the negative active material is artificial graphite; the conductive agent is SP; the binder is LA133 water-based binder; Surfactant is sodium carboxymethyl cellulose; lithium salt is LiOH and Li 2 CO 3 (Mass ratio 1:1);

[0026] The lithium ion battery negative electrode capable of reducing irreversible capacity loss is prepared by the following method:

[0027] (1) Dissolve the lithium salt in water that accounts for 10% of the total water volume to obtain a lithium salt solution for use;

[0028] (2) Mix th...

Example Embodiment

[0031] Example 2

[0032] A lithium ion battery negative electrode capable of reducing irreversible capacity loss, comprising a negative electrode current collector and a negative electrode slurry coated on the surface of the negative electrode current collector. The negative electrode slurry is made of the following mass percentage components: 45% negative electrode active material, 0.3% conductive agent, 2.69% binder, 2% surfactant, 0.01% lithium salt, 50% water. The negative active material is artificial graphite and natural graphite (mass ratio 1:1); the conductive agent is KS- 6 and vapor-grown carbon fiber (mass ratio 3:1); binder is SBR styrene butadiene rubber; surfactant is sodium carboxymethyl cellulose; lithium salt is LiOH, Li 2 CO 3 And (CH 2 OCO 2 Li) 2 (Mass ratio 1:1:1);

[0033] The lithium ion battery negative electrode capable of reducing irreversible capacity loss is prepared by the following method:

[0034] (1) Dissolve the lithium salt in water that accounts f...

Example Embodiment

[0038] Example 3

[0039] A lithium ion battery negative electrode capable of reducing irreversible capacity loss, comprising a negative electrode current collector and a negative electrode slurry coated on the surface of the negative electrode current collector. The negative electrode slurry is made of the following components by mass percentage: 29.995% negative electrode active material, 0.3~5% conductive agent, 0.3~5% binder, 0.005% lithium salt, 60% water, of which the negative active material is artificial graphite and soft carbon (mass ratio 1:3); conductive agent is SP, KS- 6 and ECP (mass ratio 1:3:1); the binder is LA133 water-based binder; the lithium salt is HCOLi and LiCH 2 CH 2 OCO 2 Li (mass ratio 2:3);

[0040] The lithium ion battery negative electrode capable of reducing irreversible capacity loss is prepared by the following method:

[0041] (1) Dissolve the lithium salt in water that accounts for 20% of the total water volume to obtain a lithium salt solution for...

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PUM

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Abstract

The invention discloses a lithium ion battery negative electrode for reducing irreversible capacity loss. The lithium ion battery negative electrode comprises a negative electrode current collector and a negative electrode paste, wherein the negative electrode paste is coated on the surface of the negative electrode current collector and comprises the following constituents based on mass: 25-45% of negative electrode active substance, 0.3-5% of conductive agent, 0.3-5% of binding agent, 0-2% of surfactant, 0.0001-0.01% of lithium salt and 50-70% of water, and the percentage sum of all constituents is 100%. With the lithium ion battery negative electrode disclosed by the invention, the irreversible capacity loss of the battery can be effectively reduced, and the energy density of the battery is improved. The invention also provides a preparation method of the lithium ion battery negative electrode for reducing the irreversible capacity loss. The process step is simple, and the method is high in operability, is easy to implement, and can be completely applied to industrial production of a lithium ion battery at a large scale.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion batteries, in particular to a lithium ion battery negative electrode capable of reducing irreversible capacity loss and a preparation method thereof. Background technique [0002] At present, in the manufacturing process of lithium-ion batteries, the positive and negative plates are directly assembled together through the separator, and irreversible capacity loss will inevitably occur after liquid injection and activation. [0003] The existing technical solutions regard the irreversible capacity loss of lithium-ion batteries as an inherent property of lithium-ion batteries. By forming an SEI film, part of the capacity of the battery is lost, which increases the irreversible capacity of the first charge and discharge, which seriously affects the battery energy. of full play. At present, a large number of studies have shown that the SEI film formed on the surface of the negative...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/366H01M4/628H01M10/0525Y02E60/10
Inventor 李凡群苏文俊
Owner WANXIANG 123 CO LTD
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