Diaphragm and battery comprising same

A separator and ceramic coating technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve problems such as the performance reduction of separator needle punching strength and thermal shrinkage, affecting battery self-discharge, safety and other performance problems.

Pending Publication Date: 2020-12-01
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional solution to battery rate, low-temperature discharge and cycle performance is mainly by increasing the porosity of the base layer of the separator (such as polyethylene or polypropylene), but with the increase of the porosity of the base layer of the separator, the needle punch strength and heat shrinkage of the separator will decrease. , affecting the self-discharge and safety performance of the battery

Method used

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  • Diaphragm and battery comprising same
  • Diaphragm and battery comprising same
  • Diaphragm and battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 20kg of alumina, 0.32kg of sodium carboxymethylcellulose, 1kg of polymethyl methacrylate, 0.1kg of polyvinylpyrrolidone, and 78.58kg of deionized water were mixed together to obtain a ceramic slurry;

[0062] Take 10 kg of the above-mentioned ceramic slurry, add 0.2 kg of heat-sensitive polymer microspheres (the particle diameter of the heat-sensitive polymer microsphere is 1.5 μm, and the heat-sensitive temperature is 110° C.), to obtain a modified ceramic slurry;

[0063] The above-mentioned modified ceramic slurry was coated on the first surface of the diaphragm base layer by micro-gravure, dried at 60° C. for 1 minute, and then subjected to high temperature treatment at 120° C. for 5 minutes to obtain the diaphragm.

[0064] The thickness of the diaphragm base layer in the diaphragm is 9 μm, the material system of the diaphragm base layer is PE, and the porosity is 40%.

[0065] The thickness of the ceramic coating in the diaphragm is 3 μm, the surface and / or inside...

Embodiment 2

[0068] 20kg of alumina, 0.32kg of sodium carboxymethylcellulose, 1kg of polymethyl methacrylate, 0.1kg of polyvinylpyrrolidone, and 78.58kg of deionized water were mixed together to obtain a ceramic slurry;

[0069] Take 10 kg of the above-mentioned ceramic slurry, add 0.4 kg of heat-sensitive polymer microspheres (the particle size of the heat-sensitive polymer microspheres is 1.5 μm, and the heat-sensitive temperature is 110° C.), to obtain a modified ceramic slurry;

[0070] The above-mentioned modified ceramic slurry was coated on the first surface of the diaphragm base layer by micro-gravure, dried at 60° C. for 1 minute, and then subjected to high temperature treatment at 122° C. for 5 minutes to obtain the diaphragm.

[0071] The thickness of the diaphragm base layer in the diaphragm is 9 μm, the material system of the diaphragm base layer is PE, and the porosity is 40%.

[0072] The thickness of the ceramic coating in the diaphragm is 3 μm, the surface and / or inside of...

Embodiment 3

[0075] 20kg of alumina, 0.32kg of sodium carboxymethylcellulose, 1kg of polymethyl methacrylate, 0.1kg of polyvinylpyrrolidone, and 78.58kg of deionized water were mixed together to obtain a ceramic slurry;

[0076] Take 10 kg of the above-mentioned ceramic slurry, add 0.6 kg of heat-sensitive polymer microspheres (the particle diameter of the heat-sensitive polymer microsphere is 1.5 μm, and the heat-sensitive temperature is 110° C.), to obtain a modified ceramic slurry;

[0077] The above-mentioned modified ceramic slurry was coated on the first surface of the diaphragm base layer by micro-gravure, dried at 60° C. for 1 minute, and then subjected to high temperature treatment at 124° C. for 5 minutes to obtain the diaphragm.

[0078] The thickness of the diaphragm base layer in the diaphragm is 9 μm, the material system of the diaphragm base layer is PE, and the porosity is 40%.

[0079] The thickness of the ceramic coating in the diaphragm is 3 μm, the surface and / or inside...

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Abstract

The invention provides a diaphragm and a battery comprising the diaphragm. The diaphragm comprises a diaphragm base layer and a ceramic coating arranged on the first surface of the diaphragm base layer, wherein the ceramic coating comprises ceramic particles, micropores are formed in the surface and / or the interior of the ceramic coating, the porosity of the ceramic coating is 40-80%, and in the micropores, the volume of pores with the pore diameter being 0.1 micrometer or above accounts for 45-90% of the total pore volume, and the volume of pores with the pore diameter being 1.0 micrometer orabove accounts for 40-80% of the total pore volume. According to the invention, a large number of micropores are formed in the surface and / or the interior of a ceramic coating, so that the porosity of a diaphragm is improved so as to improve the battery rate, residual liquid amount, low-temperature discharge and long-cycle performance, and the needling strength, the self-discharge and the safetyperformance of the diaphragm are not influenced.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-performance diaphragm and a battery including the diaphragm. Background technique [0002] With the popularity of 3C products and the rise of the electric vehicle market, the demand for lithium-ion secondary batteries is getting higher and higher. As a key component of lithium-ion secondary batteries, the separator directly affects the safety, rate, cycle, low-temperature discharge and other performance of lithium-ion secondary batteries. [0003] The traditional solution to battery rate, low-temperature discharge and cycle performance is mainly by increasing the porosity of the base layer of the separator (such as polyethylene or polypropylene), but with the increase of the porosity of the base layer of the separator, the needle punch strength and heat shrinkage of the separator will decrease. , affecting the self-discharge and safety performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525Y02E60/10H01M50/491H01M50/403H01M50/457H01M50/489H01M50/414H01M50/443H01M50/409H01M10/052H01M50/446H01M50/449H01M50/42H01M50/451H01M50/417H01M50/434
Inventor 张祖来李素丽艾新平唐伟超李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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