Water-based paint for lithium ion battery composite diaphragm, lithium ion battery composite diaphragm and lithium ion battery

A technology for lithium-ion batteries and composite diaphragms, applied in secondary batteries, battery pack components, non-polymer adhesive additives, etc., can solve problems such as poor bonding effect, improve bonding effect, and simplify production Process, effect of reducing coating cost

Inactive Publication Date: 2021-06-11
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 poor bonding effect of coatings for composite diaphragms, the application provides a water-based coating for lithium-ion battery composite diaphragms, lithium-ion battery composite diaphragms, and lithium-ion batteries.

Method used

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  • Water-based paint for lithium ion battery composite diaphragm, lithium ion battery composite diaphragm and lithium ion battery
  • Water-based paint for lithium ion battery composite diaphragm, lithium ion battery composite diaphragm and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] 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%.

[0084] 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

[0090] The difference from Example 1 is that the mass ratio of the granular polymer A emulsion to the granular polymer B emulsion is 0.04:1.

Embodiment 3

[0092] The difference from Example 1 is that the mass ratio of the granular polymer A emulsion to the granular polymer B emulsion is 0.05:1.

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Abstract

The invention relates to water-based paint for a lithium ion battery composite diaphragm, the lithium ion battery composite diaphragm and a lithium ion battery. The water-based paint comprises a binder and non-conductive inorganic particles, 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 granular polymer B has the granularity D10 of 1.0-5.0 [mu]m, the granularity D50 of 2.0-10 [mu]m, and the granularity D90 of 3.0-20 [mu]m. The particle size D50 of the non-conductive inorganic particles is smaller than the particle size D50 of the particulate polymer B. The water-based paint has the advantage of high bonding strength, the prepared composite diaphragm is good in air permeability, not prone to mutual bonding and easy to roll and store, and the lithium ion battery applying the composite diaphragm is excellent in comprehensive performance and long in cycle storage life.

Description

technical field [0001] The application relates to the field of lithium-ion battery separator materials, more specifically, it relates to a water-based paint for lithium-ion battery composite separators, lithium-ion battery composite separators and lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in small mobile portable devices such as smartphones, laptops, and power tools, as well as medium and large energy storage devices such as electric vehicles, aerospace vehicles, and power stations. They have high energy density, wide operating temperature range, The advantages of many cycle times and long storage life. Lithium-ion batteries are usually mainly composed of positive electrodes, negative electrodes, separators, electrolytes, and battery casings. The separator is one of the key inner components and has a microporous structure. Its main function is to separate the positive and negative electrodes of the battery to prevent The posi...

Claims

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Application Information

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IPC IPC(8): C09J133/08C09J11/04H01M50/434H01M50/443H01M50/449H01M50/489H01M50/497H01M10/0525
CPCC09J133/20C09J11/04H01M10/0525C08L2205/025C08L2203/206C08K2003/2227C08L33/20C08K3/22Y02E60/10
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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