Preparation method of lithium ion battery negative electrode for reducing irreversible capacity loss

A lithium-ion battery and capacity loss technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems affecting the full play of battery energy, increase irreversible capacity, etc., to reduce irreversible capacity loss, and achieve good material dispersion uniformity , the effect of strong operability

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 is to solve the problem that the negative electrode of the lithium ion battery in the prior art will increase the irreversible capacity when it is first charged and discharged, which will affect the full play of battery energy, and provides a preparation method for the negative electrode of the lithium ion battery that reduces the los

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) After weighing each component according to the mass percentage ratio of 45% negative electrode active material, 0.3% conductive agent, 4.69% binder, 0.01% lithium salt, and 50% water, dissolve the lithium salt in the total Lithium salt solution was obtained in water with a water content of 10%, and was set aside for use, wherein the negative electrode active material was natural graphite; the conductive agent was SP; the binder was SBR styrene-butadiene rubber; and the lithium salt was LiOH.

[0024] (2) Mix the surfactant and the remaining water evenly, then add the conductive agent to disperse evenly to form a conductive adhesive;

[0025] (3) Add the negative electrode active material to the conductive adhesive to disperse, then add the binder, stir evenly, and then vacuum defoam to obtain the negative electrode slurry.

[0026] (4) After the negative electrode slurry is evenly coated on the surface of the negative electrode current collector, the lithium salt so...

Embodiment 2

[0028] (1) After weighing each component according to the mass percentage ratio of 25% negative electrode active material, 1.6999% conductive agent, 0.3% binder, 2% surfactant, 0.0001% lithium salt, and 70% water, the Lithium salt is dissolved in water accounting for 20% of the total water to obtain a lithium salt solution for use, wherein the negative electrode active material is artificial graphite and composite graphite (mass ratio 1:1); the conductive agent is KS-6 and vapor-grown carbon fiber (mass ratio 1:3); the binder is LA133 water-based binder; the surfactant is sodium carboxymethylcellulose; the lithium salt is Li 2 CO 3 , LiF and Li 2 C 2 o 4 (mass ratio 1:1:1).

[0029] (2) Mix the surfactant and the remaining water evenly, then add the conductive agent to disperse evenly to form a conductive adhesive;

[0030] (3) Add the negative electrode active material to the conductive adhesive to disperse, then add the binder, stir evenly, and then vacuum defoam to obt...

Embodiment 3

[0033] (1) After weighing each component according to the mass percentage ratio of 30% negative electrode active material, 5% conductive agent, 5% binder, 1% surfactant, 0.005% lithium salt, and 58.995% water, the Lithium salt is dissolved in water accounting for 15% of the total water to obtain a lithium salt solution for use, wherein the negative electrode active material is artificial graphite, soft carbon and hard carbon (mass ratio 1:2:1); the conductive agent is ECP and carbon nanometer tube (mass ratio 1:1); binder is SBR styrene-butadiene rubber; surfactant is polyvinylpyrrolidone; lithium salt is (CH 2 OCO 2 Li) 2 , HCOLi and H 3 OCO 2 Li (mass ratio 3:1:1).

[0034] (2) Mix the surfactant and the remaining water evenly, then add the conductive agent and disperse evenly to form a conductive adhesive.

[0035] (3) Add the negative electrode active material to the conductive adhesive to disperse, then add the binder, stir evenly, and then vacuum defoam to obtain th...

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PUM

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Abstract

The invention discloses a preparation method of a lithium ion battery negative electrode for reducing irreversible capacity loss. The preparation method mainly comprises the following steps of (1) weighing a negative electrode active substance, a conductive agent, a binding agent, a surfactant, a lithium salt and water, and then dissolving the lithium salt in the water accounting for 10-20% of total water to obtain a lithium salt solution for use; (2) uniformly mixing the surfactant and the remaining water, and then adding and uniformly dispersing the conductive agent to form a conductive adhesive; (3) adding and dispersing the negative electrode active substance in the conductive adhesive, adding the binding agent, uniformly stirring, and then carrying out vacuum defoaming to obtain a negative electrode paste; and (4) uniformly applying the negative electrode paste onto the surface of the negative electrode current collector, uniformly spraying the lithium salt solution, and drying the lithium salt solution to obtain the lithium ion battery negative electrode. The process step is simple, the device requirement is low, the operability is high, the irreversible capacity loss of a battery can be effectively reduced, the energy density of the battery is enhanced, and the preparation method can be completely applied to industrial production of the lithium ion battery at a large scale.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium-ion batteries, in particular to a method for preparing negative electrodes of lithium-ion batteries that reduces irreversible capacity loss. 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 electrode is ...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/62H01M10/0525
CPCH01M4/1393H01M4/621H01M4/625H01M10/0525Y02E60/10
Inventor 李凡群苏文俊
Owner WANXIANG 123 CO LTD
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