A kind of negative electrode and its preparation method and application

A technology of negative electrode and negative electrode slurry, which is applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of high expansion rate of silicon-carbon multi-component composite negative electrode material, poor doping uniformity, poor cycle performance, etc. Simple method, improved cycle life, and the effect of inhibiting pulverization

Active Publication Date: 2022-04-22
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silicon-carbon multi-component composite anode material prepared in this document has a high expansion rate, resulting in poor cycle performance, and the amorphous carbon material is directly coated with silicon, which has low tap density, poor bonding force and poor doping uniformity, etc. question

Method used

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  • A kind of negative electrode and its preparation method and application

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Embodiment 1

[0040] This embodiment provides a kind of negative pole, and described negative pole comprises copper foil and negative electrode active layer, and the silicon-oxygen material SiO that comprises natural graphite, graphene coating in described negative pole active layer 1.5 , Ketjen black and polyacrylic acid;

[0041] Among them, in the graphene-coated silicon-oxygen material, the mass proportion of graphene is 1.5%, and the graphene-coated silicon-oxygen material SiO 1.5 The mass proportion in all negative electrode active materials is 2%.

[0042] The preparation method of described negative electrode comprises:

[0043] (1) SiO material SiO 1.5 Stir with deionized water at a mass ratio of 1:13, sonicate, then add graphene slurry with a solid content of 4.5%, continue to stir, and then spray dry to obtain graphene-coated silicon-oxygen material SiO 1.5 ;

[0044] (2) Silicon-oxygen material SiO coated with natural graphite and graphene 1.5 , Ketjen Black, and polyacrylic ...

Embodiment 2

[0046] This embodiment provides a negative electrode, the negative electrode includes copper foil and a negative electrode active layer, the negative electrode active layer includes artificial graphite, graphene-coated silicon oxide material SiO, conductive carbon black, polyacrylic acid;

[0047] Wherein, in the graphene-coated silicon-oxygen material, the mass proportion of graphene is 2%, and the mass proportion of the graphene-coated silicon-oxygen material SiO in all negative electrode active materials is 2%.

[0048] The preparation method of described negative electrode comprises:

[0049] (1) Stir and ultrasonicate the silicon-oxygen material SiO and deionized water at a mass ratio of 1:15, then add graphene slurry with a solid content of 4.5%, continue stirring, and then spray dry to obtain graphene-coated Coated silicon-oxygen material SiO;

[0050] (2) Mix artificial graphite, graphene-coated silicon-oxygen material SiO, conductive carbon black, and polyacrylic aci...

Embodiment 3

[0052] This embodiment provides a kind of negative pole, and described negative pole comprises copper foil and negative pole active layer, and described negative pole active layer comprises artificial graphite, graphene-coated silicon-oxygen material SiO 0.5 , acetylene black, sodium carboxymethylcellulose, polyacrylonitrile and styrene-butadiene rubber;

[0053] Among them, in the graphene-coated silicon-oxygen material, the mass proportion of graphene is 2%, and the graphene-coated silicon-oxygen material SiO 0.5 The mass proportion in all negative electrode active materials is 1.5%.

[0054] The preparation method of described negative electrode comprises:

[0055] (1) SiO material SiO 0.5 Stir with deionized water at a mass ratio of 1:15, sonicate, then add graphene slurry with a solid content of 4.5%, continue to stir, and then spray dry to obtain graphene-coated silicon-oxygen material SiO 0.5 ;

[0056] (2) Silicon-oxygen material SiO coated with artificial graphite...

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Abstract

The invention provides a negative electrode and its preparation method and application. The negative electrode includes a current collector and a negative electrode active layer, and the negative electrode active layer includes a first negative electrode active material, a second negative electrode active material, a conductive agent and a binder; the first negative electrode active material includes graphite, and the first negative electrode active material The two negative electrode active materials include graphene-coated silicon-oxygen materials, and the chemical formula of the silicon-oxygen materials is SiO x , 0<x<2. In the present invention, by mixing the graphite-based negative electrode active material with the graphene-coated silicon-oxygen material, on the one hand, the coating of graphene can largely inhibit the pulverization of the silicon-oxygen material caused by the volume change during charging and discharging. The safety performance and cycle performance of the battery are improved. On the other hand, the blending of the two negative active materials can greatly improve the cycle performance of the battery and increase the cycle life of the battery on the basis of ensuring the energy density of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a negative electrode and a preparation method and application thereof. Background technique [0002] At this stage, lithium-ion batteries have high energy density and high cost performance. Under the general trend of electrification of vehicles and clean energy, the market share of lithium-ion batteries for power / energy storage is growing rapidly. However, the current lithium-ion batteries are increasingly unable to meet people's needs for high mileage and long service life of electric vehicles. Power lithium batteries with high energy density, long life, high safety and low cost have become an urgent demand in the market. [0003] At this stage, the methods for improving the cycle life of lithium-ion batteries are mainly focused on 1. the selection of excellent materials; 2. the reduction of the surface density and compaction density of the pole piece at the expense...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/36H01M4/48H01M4/587H01M4/62H01M10/0525
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/366H01M4/364H01M4/483H01M4/587H01M4/628H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10H01M4/134H01M4/386H01M4/1395H01M4/36H01M4/622H01M4/62H01M4/485H01M4/48H01M4/0404
Inventor 窦洋娄帅宾刘静
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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