Thermo-sensitive coating material, thermo-sensitive diaphragm and preparation method and application of thermo-sensitive diaphragm

A coating material, heat-sensitive technology, applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problem of poor overcharge safety performance of the diaphragm, achieve good electrolyte resistance and pressure resistance, and protect overcharge safety , Improve the effect of structural stability

Inactive Publication Date: 2019-05-28
GREAT POWER BATTRY ZHUHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a heat-sensitive coating material for overcoming the defect of poor overcharge safety performance of the diaphragm described in the above-mentioned prior art

Method used

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  • Thermo-sensitive coating material, thermo-sensitive diaphragm and preparation method and application of thermo-sensitive diaphragm
  • Thermo-sensitive coating material, thermo-sensitive diaphragm and preparation method and application of thermo-sensitive diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A heat-sensitive coating material, comprising the following components by mass percentage: 4% of polyacrylate binder, 85.5% of alumina, 0.5% of sodium polyacrylate, and 10% of heat-expandable microspheres of polyacrylic acid matrix.

[0057] A heat-sensitive diaphragm and a preparation method thereof, comprising the steps:

[0058] (1) Slurry preparation: add 0.5 parts by mass of sodium polyacrylate to 65.5 parts by mass of deionized water, stir at 1500 r / min for 30 min, then add 85.5 parts by mass of alumina and 10 parts by mass of polyacrylic acid matrix Heat-expandable microspheres were stirred at a high speed of 3000 r / min for 60 min, finally added 4 parts by mass of polyacrylate binder, stirred at a medium speed of 1500 r / min for 60 min, and then stirred at a low speed of 500 r / min for 30 min to degas , and then pass through a screen to obtain a heat-sensitive coating material.

[0059] (2) Coating: A heat-sensitive coating material was coated on one side of the 1...

Embodiment 2

[0061] A heat-sensitive coating material, comprising the following components by mass percentage: 4% of polyacrylate binder, 85.5% of alumina, 0.5% of sodium polyacrylate and 10% of heat-expandable microspheres of hyperbranched polypropylene matrix.

[0062] A heat-sensitive diaphragm and preparation method thereof:

[0063] The difference between this example and Example 1 is that in step (1) of this example, the thermally expandable polymer microspheres are hyperbranched polypropylene matrix thermally expandable microspheres;

[0064] The consumption of other raw materials and operation steps are the same as those in Example 1.

Embodiment 3

[0066] A heat-sensitive coating material, comprising the following components by mass percentage: 4% of polyacrylate binder, 85.5% of alumina, 0.5% of sodium polyacrylate and 10% of heat-expandable microspheres of hyperbranched polyethylene matrix.

[0067] A heat-sensitive diaphragm and preparation method thereof:

[0068] The difference between this example and Example 1 is that in step (1) of this example, the heat-expandable polymer microspheres are hyperbranched polyethylene matrix heat-expandable microspheres;

[0069] The consumption of other raw materials and operation steps are the same as those in Example 1.

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Abstract

The invention discloses a heat-sensitive coating material, a heat-sensitive diaphragm and a preparation method and application of the heat-sensitive diaphragm. The heat-sensitive coating material comprises the following components in percentage by mass: 3%-10% of a polymer binder, 80%-90% of inorganic metal oxide, 0.5%-1% of a dispersing agent and 5%-15% of thermal expansion polymer microspheres.The heat-sensitive coating material provided by the invention comprises a polymer binder, an inorganic metal oxide, a dispersing agent and thermal expansion polymer microspheres. The thermal sensitivediaphragm prepared from the thermal sensitive coating material enables the battery to have high safety performance in the overcharging process, and has good structural stability.

Description

technical field [0001] The invention relates to the field of battery separators, and more particularly, to a heat-sensitive coating material, a heat-sensitive separator and a preparation method and application thereof. Background technique [0002] With the development of electronic communication equipment, computer equipment, and mobile communication equipment, there is an increasing demand for lithium secondary batteries used as power sources for these equipment. There is a wave of research and development of lithium secondary batteries all over the world. In addition, lithium secondary batteries are not only used as power sources for mobile electronic devices, but also as environmentally friendly power sources for electric vehicles, power tools, satellites and other equipment. [0003] The lithium secondary battery includes a lithium transition alkaline metal oxide positive electrode, a negative electrode that can intercalate and desorb lithium ions, a separator between t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/446H01M50/449
CPCY02E60/10
Inventor 刘勇刘建生夏信德
Owner GREAT POWER BATTRY ZHUHAI
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