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Method for preparing cross-linking waterborne adhesive for lithium ion batteries

A lithium-ion battery, water-based binder technology, applied in the directions of adhesives, secondary batteries, battery electrodes, etc., can solve the problems of low bonding strength, lack of elasticity, etc., and achieves simple preparation method, low cost, and wide sources. Effect

Active Publication Date: 2018-03-13
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a preparation method of cross-linked water-based binder for lithium ion batteries, which is composed of water-based polymers containing organic carboxylic acid or amino groups or hydroxyl groups and water-soluble small molecules containing hydroxyl groups, amino groups or carboxyl groups. As the raw material of water-based binder, it is cross-linked by esterification and amidation reaction under the condition of coating and drying the electrode sheet slurry of lithium ion battery. The preparation process is simple, no additional processing conditions are required, and good bonding The electrode is flexible, flexible and elastic, and solves the problem that the bonding strength between the electrode active material, the conductive agent and the current collector is not high in the prior art, and it does not have enough elasticity to alleviate the expansion of the lithium-ion battery during charging and discharging. Problems with shrinkage and swell shedding

Method used

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  • Method for preparing cross-linking waterborne adhesive for lithium ion batteries
  • Method for preparing cross-linking waterborne adhesive for lithium ion batteries
  • Method for preparing cross-linking waterborne adhesive for lithium ion batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Solubility Experiment of GA-PAA Crosslinked with Hydroxyl-containing Small Molecules

[0044] (1) Firstly, 1g of GA-PAA (molecular weight: 400,000-1,000,000) was dissolved in 10ml of deionized water (DI-Water) in advance, and fully stirred under an argon atmosphere for 0.5-2.5 hours to drive off oxygen to obtain uniformity and good dispersibility solution; the stirring speed is 100-500 rpm;

[0045] (2) Add one or more of ethylene glycol, glycerol, and pentaerythritol (OH:GA-PAA=1:10 molar ratio) to the solution obtained in step (1), and stir fully to obtain a mixed solution; vacuum temperature Esterification reaction at 45°C, 90°C, and 110°C for 1-24h, then dissolve in a certain quality of water respectively, and observe the dissolution status.

Embodiment 2

[0047] Referring to Example 1, the difference lies in step (2): add triethanolamine and other amine group-containing small molecule cross-linking agents into the solution obtained in step (1), undergo amidation reactions at different temperatures, and observe its dissolution.

Embodiment 3

[0049] Referring to Example 1, the difference lies in step (2): adding a hexamethoxymethylmelamine (HMMM) crosslinking agent into the solution obtained in step (1), and performing esterification treatment at different temperatures. Observe its dissolution.

[0050] It can be seen from Examples 1-3 that GA-PAA can be completely dissolved at 45-90°, and cross-linking and swelling will occur when heated above 110°. When pentaerythritol (PER), triethanolamine (TEOA) or hexamethoxymethylmelamine (HMMM) is added to the GA-PAA system, it can be completely dissolved by heating at 45°, and cross-linking will occur when the temperature rises to 90° or above swelling phenomenon.

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Abstract

The invention discloses a method for preparing cross-linking waterborne adhesive for lithium ion batteries. Waterborne polymers containing organic carboxylic acid, amino or hydroxyl and a water-soluble micromolecular cross-linking agent containing hydroxyl, amino or carboxyl are jointly used as raw materials of the waterborne adhesive and subjected to cross linking through esterification and amidation under the condition of coating and drying of electrode plate paste of the lithium ion batteries. A preparation process is simple, existing lithium ion battery production process conditions are unchanged, electrodes high in bonding performance, flexibility and elasticity are obtained, and problems of low bonding strength among electrode active substances, conductive agents and current collectors and looseness and shedding due to insufficiency in elasticity for relieving expansion and contraction in charging and discharging processes of the lithium ion batteries in the prior art are solved.

Description

Technical field: [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a crosslinked water-based binder for lithium ion batteries. Background technique: [0002] Binder is an important inactive component of lithium-ion batteries, and its performance directly affects the electrochemical performance of batteries. In addition to the bonding effect, the binder should also have sufficient elasticity to relieve the expansion and contraction of the battery during charging and discharging, which will facilitate the conduction of electrons and ions during charging and discharging, and reduce the size of the current collector. resistance to the electrode material. In the large-scale production of the lithium-ion battery industry, polyvinylidene fluoride (PVDF) is mainly used as a binder, and the organic solvent N-methylpyrrolidone (NMP) is used as a dispersant. However, due to the poor electronic and ionic conductivity...

Claims

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Application Information

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IPC IPC(8): C09J151/02C09J129/04C09J151/00C08F251/00C08F220/06C08F8/14C08F8/30C08F8/32C08F261/04C08F216/06C08G73/02H01M4/62H01M4/131H01M4/136H01M10/0525
CPCH01M4/131H01M4/136H01M4/622H01M10/0525C09J129/04C09J151/003C09J151/02C08F8/14C08F8/30C08F8/32C08F251/00C08F261/04C08G73/0213C08F220/06C08F216/06H01M4/134H01M4/133Y02E60/10C08L87/00C08L2203/20C08L2312/00H01M2004/027H01M2004/028H01B1/20
Inventor 张灵志仲皓想刘姝伶苏静黄进鑫
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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