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Water-based binder for lithium ion battery diaphragm

A lithium-ion battery, water-based binder technology, used in secondary batteries, binder types, battery pack components, etc., can solve problems such as poor bonding effect of binders

Inactive Publication Date: 2021-06-08
深圳好电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to improve the problem of poor bonding effect of the binder for lithium-ion battery separators, the application provides a water-based binder for lithium-ion battery separators

Method used

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  • Water-based binder for lithium ion battery diaphragm
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Preparation of granular polymer A: Weigh 0.64 parts of surfactant and 400 parts of deionized water into a stirring container, add 65 parts of ethyl acrylate, 5 parts of acrylic acid, 10 parts of acrylonitrile, 10 parts of methyl methacrylate, 10 parts of allyl methacrylate, control the stirring speed at 450±50rpm, stir and heat to 74±1°C, then add 1.2 parts of initiator, keep stirring at 74±1°C for 6h, then raise the temperature to 79±1°C, continue to react for 3h , to obtain a granular polymer A emulsion with a solid content of 20%.

[0068] Preparation of Granular Polymer B: Preparation of Granular Polymer B: Add 60 parts of anhydrous MgSO to a stirred vessel 4 powder and 340 parts deionized water, stirred to make 15wt% MgSO 4 400 parts of aqueous solution, add 5 parts of surfactant, 30 parts of methyl methacrylate, 20 parts of acrylonitrile, 40 parts of ethyl acrylate, 10 parts of allyl methacrylate, control the stirring speed at 450±50rpm, stir and heat up to 80 °...

Embodiment 2

[0072] The difference from Example 1 is that the matrix resin ratio used in the preparation of granular polymer A is 65 parts of ethyl acrylate, 5 parts of acrylic acid, 10 parts of acrylamide, 10 parts of methyl methacrylate, 10 parts of methacrylic acid Allyl ester, the matrix resin ratio that adopts in the preparation of granular polymer B is 30 parts of methyl methacrylate, 20 parts of acrylic acid, 40 parts of n-butyl methacrylate, 10 parts of allyl methacrylate.

Embodiment 3

[0074] The difference from Example 1 is that the matrix resin ratio used in the preparation of granular polymer A is 65 parts of ethyl acrylate, 5 parts of acrylonitrile, 10 parts of acrylamide, 10 parts of methyl methacrylate, 10 parts of methyl Allyl acrylate, the matrix resin ratio adopted in the preparation of granular polymer B is 30 parts of acrylic acid, 20 parts of n-butyl methacrylate, 40 parts of allyl methacrylate, and 10 parts of ethyl methacrylate.

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Abstract

The invention relates to the field of lithium ion battery diaphragm materials, in particular to a water-based binder for a lithium ion battery diaphragm. The binder comprises a granular polymer A and a granular polymer B; the glass transition temperature of the granular polymer A is lower than that of the granular polymer B, the granularity D50 of the granular polymer A is 0.05-1.0 [mu]m, and the granularity D10 of the granular polymer B is 1.0-5.0 [mu]m, the granularity D50 is 2.0-10 [mu]m, and the granularity D90 is 3.0-20 [mu]m. The water-based binder has the advantage of high bonding strength, and the composite diaphragm prepared from the water-based binder is good in air permeability and easy to roll and store.

Description

technical field [0001] The present application relates to the field of lithium-ion battery separator materials, more specifically, it relates to a lithium-ion battery separator water-based binder. Background technique [0002] Lithium-ion batteries have been widely used in small mobile portable devices such as smart phones, notebook computers, power tools, etc., as well as electric vehicles, aviation, etc. Medium and large energy storage equipment such as spacecraft and power stations. [0003] Lithium-ion batteries are usually mainly composed of positive electrodes, negative electrodes, diaphragms, electrolytes, and battery casings. The diaphragm is one of the key inner components. Its main function is to separate the positive and negative electrodes of the battery and prevent the positive and negative electrodes from contacting each other. And short circuit. At present, the separators used in lithium-ion batteries are generally polyolefin porous membranes. Since the melt...

Claims

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Application Information

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IPC IPC(8): C09J133/08C09J133/10C09J133/12H01M50/431H01M50/434H01M50/443H01M50/449H01M50/46H01M10/0525
CPCC09J133/20C09J133/12H01M10/0525C08L2205/025C08L2205/02C08L2203/206C08L33/20C08L33/26Y02E60/10
Inventor 王键曹华伟陶晶张紫方李涛
Owner 深圳好电科技有限公司
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