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-bas

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

Example Embodiment

[0082] Example 1:

[0083] Preparation of particulate polymer A: 0.64 parts of surfactants and 400 parts of deionized water were added to the stirring vessel, and 65 servium acrylate, 5 parts of acrylic acid, 10 parts of acrylonitrile, 10 parts of methacrylate, 10 parts of methacrylate, control of the stirring speed of 450 ± 50 rpm, stirred to 74 ± 1 ° C, then add 1.2 parts of the initiator, maintain 74 ± 1 ° C stirring reaction for 6 h, litaged to 79 ± 1 ° C, continued to react 3h Also a particulate polymer A emulsion having a solid content of 20% is obtained.

[0084] Preparation of particulate polymer B: Preparation of particulate polymer B: 60 parts of anhydrous MGSO is added to the stirring vessel 4 Powder and 340 parts of deionized water, stirred for 15% by weight MgSO 4 400 parts of the aqueous solution, 5 parts of surfactant, 30 parts of methacrylate, 20 parts of acrylonitrile, ethyl acrylate, 10 parts of methacrylate, controlling the stirring speed of 450 ± 50 rpm, stirri...

Example Embodiment

[0089] Example 2:

[0090] The mass ratio of the difference in the difference from the particulate polymer A emulsion and the particulate polymer B emulsion is 0.04: 1.

Example Embodiment

[0091] Example 3:

[0092] The mass ratio of the difference from the particulate polymer A emulsion and the particulate polymer B emulsion was 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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