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A negative pole piece and a lithium ion battery comprising the negative pole piece

A technology for lithium-ion batteries and negative pole pieces, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems affecting battery cycle performance, high-rate charge and discharge performance, and slow wettability of negative active materials. Novelty, good effect and convenient operation

Active Publication Date: 2022-07-15
ZHUHAI COSMX POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the slow wettability of the electrolyte in the existing lithium-ion battery to the low-porosity negative electrode active material like SiO, which seriously affects the cycle performance and high-rate charge-discharge performance of the battery, the present invention provides a negative electrode sheet and a lithium ion battery comprising the negative electrode sheet, the negative electrode sheet can effectively solve the problem of slow wettability of the electrolyte in the lithium ion battery to the negative electrode active material

Method used

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  • A negative pole piece and a lithium ion battery comprising the negative pole piece
  • A negative pole piece and a lithium ion battery comprising the negative pole piece

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Preparation of positive electrode sheet

[0041] The positive active material NCM622, the binder PVDF, conductive carbon black and carbon nanotubes are dispersed in N-methylpyrrolidone, and a uniform positive electrode slurry is obtained after stirring, wherein the solid content includes 93wt% NCM622, 4wt% conductive carbon black, 1wt% % carbon nanotubes and 2 wt% binder PVDF, the solid content of the positive electrode slurry is 51%, and the viscosity is 5360 mPa·s. Roll compaction to 2.5g / cm 3 , get the positive electrode sheet;

[0042] (2) Preparation of negative electrode sheet

[0043] The negative electrode active material artificial graphite and SiO, SBR binder, conductive carbon black, sodium carboxymethyl cellulose and p-acetamidophenol acetate are dispersed in solvent water, and after stirring, a uniform negative electrode slurry is obtained, wherein the solid content comprises 93wt% artificial graphite, 2wt% SiO, 1.5wt% conductive carbon black, 1.2wt%...

Embodiment 2

[0047] The difference from Example 1 is that the negative active material in step (2) of Example 2 is 91 wt % artificial graphite and 4 wt % SiO.

Embodiment 3

[0049] The difference from Example 1 is that the negative electrode active material in step (2) of Example 3 is 75 wt % artificial graphite and 20 wt % SiO.

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Abstract

The present invention provides a negative pole piece and a lithium ion battery including the negative pole piece. The negative pole piece has the following beneficial effects: in the past, improving the infiltration of the negative electrode active material by the electrolyte generally starts with the electrolyte, and in the electrolyte Additives with high liquid absorption capacity are added, but there are many side reactions in the electrolyte, and the added additives will be consumed by the reaction at the negative electrode, which increases the burden of the electrolyte to a certain extent. The dispersing aid of the present invention is directly added to the negative pole piece, which is convenient to operate, and can improve the rate charging and discharging performance of the battery while improving the infiltration of the electrolyte. The method of adding a dispersing aid to the negative electrode of the present invention is novel, achieves good effect, and effectively improves the dispersion problem of the negative electrode pole piece and the problems of long aging time after liquid injection, poor battery cycle and high rate discharge.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a negative pole piece and a lithium ion battery including the negative pole piece. Background technique [0002] Lithium-ion batteries have been widely used in mobile phones, notebook computers, new energy vehicles and other fields due to their high energy density, high operating voltage, and good cycle storage performance. [0003] With the development of the new energy industry, the demand for batteries with higher energy density and higher power density is becoming more and more urgent, and major companies are racing to develop lithium-ion batteries with higher energy density and higher power density. The acquisition of high energy density batteries is mainly improved from the high gram capacity and high compaction density of the positive and negative materials. At the same time, the negative electrode materials are mixed with high gram capacity mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/62H01M10/42H01M10/0525
CPCH01M4/667H01M10/4235H01M4/62H01M10/0525H01M2004/027Y02E60/10
Inventor 孟林娟余开明申红光靳玲玲
Owner ZHUHAI COSMX POWER CO LTD