A kind of modified water-based binder and its preparation method and application

A water-based binder and modification technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of poor stability, low bonding strength and poor stability of water-based binders, and achieve strong alkali resistance, Good dispersion and stable performance

Active Publication Date: 2022-06-14
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water-based binder has poor stability in the electrolyte and a high liquid absorption rate.
[0008] The water-based binder described in the above scheme has problems such as low bond strength, poor stability or high liquid absorption rate. Therefore, it is very necessary to develop a water-based binder with high bond strength, good stability or low liquid absorption rate. of

Method used

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  • A kind of modified water-based binder and its preparation method and application
  • A kind of modified water-based binder and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The present embodiment provides a modified water-based binder, and the modified water-based binder is prepared by the following method:

[0042] (1) Mix 0.8 parts of RAFT reagent, 0.3 parts of initiator, and 50 parts of acrylic monomers and react at 65°C for 12 hours to obtain 50 parts of polyacrylate;

[0043](2) adding 25 parts of isooctyl acrylate monomer to the polyacrylate obtained in step (1), and reacting at 70° C. for 8 hours to obtain a binary copolymer of acrylic acid and acrylate;

[0044] (3) After dissolving the acrylic acid and acrylate binary copolymer obtained in step (2), adding 25 parts of methyl methacrylate monomer and 431 parts of deionized water, and mixing at 4500 r / min for 4 hours to obtain the modified water-based adhesive.

[0045] The schematic diagram of the modified water-based binder is as follows figure 1 shown.

Embodiment 2

[0047] The present embodiment provides a modified water-based binder, and the modified water-based binder is prepared by the following method:

[0048] (1) Mix 0.6 parts of RAFT reagent, 0.5 parts of initiator, and 50 parts of acrylic monomer and react at 70°C for 15 hours to obtain 50 parts of polyacrylate;

[0049] (2) adding 20 parts of isooctyl acrylate monomer to the polyacrylate obtained in step (1), and reacting at 75°C for 9 hours to obtain a binary copolymer of acrylic acid and acrylate;

[0050] (3) After dissolving the acrylic acid and acrylate binary copolymer obtained in step (2), adding 30 parts of methyl methacrylate monomer and 573 parts of deionized water, and mixing at 4000 r / min for 5 hours to obtain the modified water-based adhesive.

Embodiment 3

[0052] The only difference between this example and Example 1 is that the acrylic monomer in step (1) is 55 parts, the isooctyl acrylate monomer in step (2) is 20 parts, and other conditions and parameters are completely the same as in Example 1 same.

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Abstract

The invention provides a modified water-based binder and its preparation method and application. The modified water-based binder includes a main body, a soft monomer and a homopolymer; wherein the main body includes polyacrylate, and the The soft monomer includes copolymerized 2-benzoyl-3-hydroxy-1-propylene and / or isooctyl acrylate, the homopolymer includes polymethyl methacrylate, and the overall bonding strength of the binder is relatively high , good dispersion and stable performance in the electrolyte.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and relates to a modified water-based binder and a preparation method and application thereof. Background technique [0002] The current market demand for new energy is rising rapidly, especially in the field of lithium-ion power batteries, more and more electric vehicles equipped with lithium-ion batteries are on the market, and the number-limiting policies in some cities have also given lithium-ion battery new energy vehicles. In the past two years, there have been frequent fire accidents in electric vehicles equipped with ternary cathode material lithium-ion batteries, while lithium iron phosphate (LFP) cathode material lithium-ion batteries are safe due to the stable structure and high temperature decomposition characteristics of lithium iron phosphate materials. It has great advantages. In addition, the lithium iron phosphate material does not contain heavy metals, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/136H01M10/0525
CPCH01M4/622H01M4/136H01M10/0525Y02E60/10
Inventor 雷雨魏迪锋李昊徐永刚黄渭王进袁野
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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