Modified water-based binder as well as preparation method and application thereof

A water-based binder and modification technology, applied in the field of modified water-based binder and its preparation, can solve the problems of poor stability, low bonding strength and high liquid absorption rate of the water-based binder, and achieve strong alkali resistance. , good dispersion, low liquid absorption effect

Active Publication Date: 2021-07-02
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Modified water-based binder as well as preparation method and application thereof
  • Modified water-based binder as well as preparation method and application thereof
  • Modified water-based binder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment provides a modified water-based binder, which 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 monomer and react at 65°C for 12 hours to obtain 50 parts of polyacrylate;

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

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

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

Embodiment 2

[0047] This embodiment provides a modified water-based binder, which 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) Add 20 parts of p-isooctyl acrylate monomer to the polyacrylate obtained in step (1), and react at 75°C for 9 hours to obtain acrylic acid and acrylate binary copolymer;

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

Embodiment 3

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

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Abstract

The invention provides a modified water-based binder as well as a preparation method and application thereof. The modified water-based binder comprises a main monomer, a soft monomer and a homopolymer, wherein the main monomer comprises polyacrylate, the soft monomer comprises copolymerized 2-benzoyl-3-hydroxy-1-propylene and / or 2-ethylhexyl acrylate, the homopolymer comprises polymethyl methacrylate, and the binder is relatively high in overall bonding strength, relatively good in dispersity and stable in performance in an 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. The number-limiting policies of some cities also give lithium-ion battery new energy vehicles a very large space for development. In the past two years, there have been frequent fire accidents of electric vehicles equipped with ternary cathode material lithium-ion batteries, and lithium iron phosphate (LFP) cathode material lithium-ion batteries are safe because of the stable structure and high-temperature decomposition characteristics of lithium iron phosphate materials. In addition, the lithium iron phosphate material does not contain heavy metals, an...

Claims

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Application Information

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Patent Type & Authority Applications(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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