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High-proportion silicon negative electrode aqueous composite binder and application thereof

A composite binder and silicon negative electrode technology, which is applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of negative electrode volume expansion and shrinkage, electrode powdering, etc., and achieve good adaptability, good tensile performance, and improved cycle time. The effect of stability

Inactive Publication Date: 2020-06-05
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention: to solve the problem of powdering of the negative electrode caused by the expansion and contraction of the negative electrode volume during the charging and discharging process of the silicon negative electrode of the lithium battery

Method used

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  • High-proportion silicon negative electrode aqueous composite binder and application thereof
  • High-proportion silicon negative electrode aqueous composite binder and application thereof
  • High-proportion silicon negative electrode aqueous composite binder and application thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Application of PI-PAA-SBR composite binder in silicon negative electrode of lithium battery: SiOx (mixed carbon), conductive agent carbon black (Super-P) and composite binder with a mass ratio of 7.5:1:1.5 Made of negative electrode sheet. PI is configured as a 7.5% aqueous solution, PAA is configured as a 25% aqueous solution, and SBR is configured as a 5% aqueous solution. The three binders are mixed according to the mass ratio of 2:6:2) and the pH value of the mixed aqueous solution is adjusted using NaOH to (5-9). Put the negative electrode active material, conductive carbon, etc. into the binder aqueous solution in a certain order, and add water with a total mass fraction of 20%-40% to mix and homogenate. After the negative electrode sheet is rolled, the rolled negative electrode sheet is placed in a vacuum drying oven and heated in vacuum at 140° C. for 6 hours. The negative electrode sheet is completed. The peel strength test results are as follows figure 1 s...

example 2

[0024] Application of PI-PAA-SBR composite binder in silicon negative electrode of lithium battery: SiOx (mixed carbon), conductive agent carbon black (Super-P) and composite binder with a mass ratio of 7:1.5:1.5 Made of negative electrode sheet. PI is configured as a 5% aqueous solution, PAA is configured as a 30% aqueous solution, and SBR is configured as a 5% aqueous solution. The three binders are mixed according to a mass ratio of 3:6:1, and then NaOH is used to adjust the pH value of the mixed aqueous solution. to (5-9). Put the negative electrode active material, conductive carbon, etc. into the binder aqueous solution in a certain order, and add water with a total mass fraction of 20%-40% to mix and homogenate. After the negative electrode sheet is rolled, the rolled negative electrode sheet is placed in a vacuum drying oven and heated in vacuum at 180° C. for 4 hours. The negative electrode sheet is completed. The peel strength test results are as follows figure 1...

example 3

[0026] Application of PI-PAA-SBR composite binder in silicon negative electrode of lithium battery: SiOx (mixed carbon), conductive agent carbon black (Super-P) and composite binder with a mass ratio of 7.5:1.5:1 Made of negative electrode sheet. PI is configured as a 10% aqueous solution, PAA is configured as a 20% aqueous solution, and SBR is configured as a 5% aqueous solution. The three binders are mixed according to the mass ratio of 2.5:6:1.5, and then NaOH is used to adjust the pH value of the mixed aqueous solution. to (5-9). Put the negative electrode active material, conductive carbon, etc. into the binder aqueous solution in a certain order, and add water with a total mass fraction of 20%-40% to mix and homogenate. After the negative electrode sheet is rolled, the rolled negative electrode sheet is placed in a vacuum drying oven and heated in vacuum at 200° C. for 2 hours. The negative electrode sheet is completed. The peel strength test results are as follows f...

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Abstract

The invention relates to a high-proportion silicon negative electrode aqueous composite binder, which is prepared by the following steps: mixing a polymer A, a polymer B and a polymer C into a negative electrode plate, and heating the negative electrode plate in vacuum, wherein the polymer A is water-soluble polyimide (PI), the polymer B is at least one of polyacrylic acid (PAA) or polymethylacrylic acid (PMAA), and the polymer C is water-soluble styrene-butadiene latex (SBR). T the aqueous composite binder combines good cohesiveness of PI, PAA (PMAA) and SBR, shows good tensile property, canform a cross-linked network after heating treatment, improves the bonding effect, can well adapt to expansion of the volume of the silicon negative electrode, and improves the cycling stability of thesilicon negative electrode.

Description

technical field [0001] The application belongs to the field of lithium battery manufacturing, and specifically relates to the field of lithium battery silicon negative electrodes. Background technique [0002] At present, graphite is the negative electrode material commonly used in lithium-ion batteries, and its theoretical specific capacity (372mAh / g) is low, which cannot meet the application requirements of high energy density batteries. A new negative electrode material is needed as a substitute, among which silicon-based materials It is the most promising alternative option: for example, silicon-oxygen material has a very high theoretical specific capacity (>2100mAh / g) as a negative electrode material for lithium batteries. However, during the charging and discharging process of silicon-based materials, silicon particles will undergo huge volume changes when lithium ions are embedded in the silicon crystal. The volume expansion rate of silicon-oxygen materials will re...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M10/0525
CPCH01M4/386H01M4/622H01M10/0525Y02E60/10
Inventor 梁策吴昱磊叶光保
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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