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High-heat-resistance lithium battery composite diaphragm and preparation method thereof

A composite diaphragm and lithium battery technology, which is applied to battery pack components, circuits, electrical components, etc., to achieve the effects of improving heat resistance, safety performance, safety performance and cycle performance

Active Publication Date: 2017-09-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method of the present invention does not use organic solvents

Method used

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  • High-heat-resistance lithium battery composite diaphragm and preparation method thereof
  • High-heat-resistance lithium battery composite diaphragm and preparation method thereof
  • High-heat-resistance lithium battery composite diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A preparation method of a high heat-resistant lithium battery composite diaphragm, comprising the following steps:

[0034] (1) Add 8 parts of polyvinyl alcohol powder into 100 parts of deionized water, swell at room temperature for 10 hours, and then mechanically stir for 4.5 hours at 90°C and a stirring rate of 800r / min to obtain a polyvinyl alcohol solution;

[0035] (2) Magnetically stir 4 parts of ethyl orthosilicate, 9 parts of absolute ethanol, and 9 parts of deionized water at a stirring rate of 400r / min for 20min, add 0.8 parts of ammonia water dropwise, and stir at 40°C and 800r / min After magnetically stirring for 1 hour at a high speed, add it and 0.8 parts of alumina powder with a particle size of 50 nm to the polyvinyl alcohol solution obtained in step (1), and stir for 12 hours at 45° C. to obtain the coating slurry;

[0036] (3) Apply the slurry to the surface of the PP separator by the coating method, dry it at room temperature for 2.5 hours, and dry it ...

Embodiment 2

[0041] A preparation method of a high heat-resistant lithium battery composite diaphragm, comprising the following steps:

[0042] (1) Add 9 parts of polyvinyl alcohol powder into 100 parts of deionized water, swell at room temperature for 10 hours, and then mechanically stir for 4.5 hours at 90°C and 800r / min stirring speed to obtain a polyvinyl alcohol solution;

[0043] (2) Magnetically stir 3 parts of ethyl orthosilicate, 9 parts of absolute ethanol, and 9 parts of deionized water at a stirring rate of 400r / min for 20min, add 0.6 parts of ammonia water dropwise, and stir at 40°C and 800r / min After magnetically stirring for 1 hour at a high speed, add it and 0.8 parts of alumina powder with a particle size of 40 nm to the polyvinyl alcohol solution obtained in step (1), and stir for 12 hours at 45° C. to obtain the coating slurry;

[0044](3) Apply the slurry to the surface of the PP separator by the coating method, dry it at room temperature for 2.5 hours, and dry it in va...

Embodiment 3

[0046] A preparation method of a high heat-resistant lithium battery composite diaphragm, comprising the following steps:

[0047] (1) Add 10 parts of polyvinyl alcohol powder into 100 parts of deionized water, swell at room temperature for 10 hours, and then mechanically stir for 4.5 hours at 90°C and 800r / min stirring speed to obtain a polyvinyl alcohol solution;

[0048] (2) Magnetically stir 4 parts of ethyl orthosilicate, 9 parts of absolute ethanol, and 9 parts of deionized water at a stirring rate of 400r / min for 20min, add 0.8 parts of ammonia water dropwise, and stir at 40°C and 800r / min After magnetically stirring for 1 hour at a high speed, add it and 0.8 parts of alumina powder with a particle size of 50 nm to the polyvinyl alcohol solution obtained in step (1), and stir for 12 hours at 45° C. to obtain the coating slurry;

[0049] (3) Apply the slurry to the surface of the PP separator by the coating method, dry it at room temperature for 2.5 hours, and dry it in ...

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Abstract

The invention discloses a high-heat-resistance lithium battery composite diaphragm and a preparation method thereof. The preparation method comprises the following steps: adding polyvinyl alcohol powder into deionized water, swelling at the room temperature for 10-12 hours, and stirring at 85-95 DEG C for 4-5 hours, so as to prepare a polyvinyl alcohol solution; mixing and stirring ethyl orthosilicate, absolute ethyl alcohol and deionized water, dropwise adding ammonia water, and stirring at 40-45 DEG C for 0.5-1 hour, so as to obtain a mixture; adding the obtained mixture and aluminum oxide powder into the obtained polyvinyl alcohol solution, and stirring at 40-45 DEG C for 10-12 hours, so as to obtain a coating sizing agent; and coating the surface of a pretreated polyolefin microporous membrane with the sizing agent by virtue of a coating method, drying at the room temperature, and carrying out vacuum drying, so as to obtain the high-heat-resistance lithium battery composite diaphragm. The preparation method is simple in process and environment-friendly, and the prepared composite diaphragm is high in heat resistance, liquid absorbing rate and liquid retention rate and excellent in electrochemical performance and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of modification of lithium battery diaphragms, in particular to a high heat-resistant lithium battery composite diaphragm and a preparation method thereof. Background technique [0002] As one of the important components of lithium batteries, the separator mainly plays the role of physically blocking the positive and negative electrodes, retaining the electrolyte, and providing channels for lithium ion migration. At present, the commercialized separator is mainly polyolefin microporous membrane. Since polyolefin separator has a low melting point and is mostly made by stretching pore-forming process, when the battery is working under high-strength conditions, this separator is easy to shrink, which may cause If the battery is short-circuited, there are potential safety hazards such as fire or explosion. In addition, due to the high surface energy of the polyolefin separator, the wettability of the polar solv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C09D129/04C09D7/12H01M2/14H01M2/16C08L23/12
CPCC08J2323/12C08J2429/04C08K3/36C08K2003/2227C08K2201/011C09D129/04C08J7/0427H01M50/403H01M50/411H01M50/446H01M50/449Y02E60/10
Inventor 袁文辉张志雄李莉
Owner SOUTH CHINA UNIV OF TECH
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