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High-performance lithium ion battery diaphragm and preparation method

A lithium-ion battery, high-performance technology, used in secondary batteries, battery pack components, separators/films/diaphragms/spacers, etc., can solve the problems of insufficient diaphragm performance and inflexible adjustment of composite diaphragm performance. , to achieve the effect of reducing density, good performance stability and low density

Inactive Publication Date: 2020-07-17
曹亚琼
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the disadvantages that the performance adjustment of the obtained composite diaphragm is not flexible enough, and the performance of the diaphragm is not strong enough.

Method used

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  • High-performance lithium ion battery diaphragm and preparation method
  • High-performance lithium ion battery diaphragm and preparation method
  • High-performance lithium ion battery diaphragm and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mix 1 part of methyl orthosilicate and 5 parts of methanol, add 3 parts of deionized water and mix evenly, add oxalic acid under stirring to adjust the pH to 2.5 for hydrolysis, then add ammonia water to adjust the pH to 9.5 for condensation to obtain a gel. After aging and replacing with absolute ethanol, the glue was soaked in n-dodecyldimethylchlorosilane with a concentration of 10g / L and 3-(methacryloyloxy)propyldimethylchlorosilane with a concentration of 10g / L. The solution was modified for 5 hours, taken out, and dried with supercritical carbon dioxide to obtain n-dodecyl / ester group co-modified silica airgel.

[0034] Take 50 parts of polypropylene, 10 parts of ultra-high molecular weight polypropylene and 1 part of n-dodecyl / ester-based co-modified silica airgel, mix them, and use a granulator to granulate to obtain master batches;

[0035] Mix the masterbatch obtained above, 50 parts of polypropylene, 1 part of anti-aging agent, 1 part of lubricant and 0.3 par...

Embodiment 2

[0037] Mix 1 part of tetraethyl orthosilicate with 8 parts of absolute ethanol, add 4 parts of deionized water and mix evenly, add oxalic acid under stirring to adjust the pH to 2.5 for hydrolysis, then add ammonia water to adjust the pH to 9.5 for condensation to obtain a gel. Said gel was aged, replaced with absolute ethanol, soaked into n-tetradecyl dimethyl chlorosilane concentration of 40g / L and 3-(methacryloyloxy) propyl dimethyl chlorosilane concentration of 30g / L L solution was modified for 3 hours, taken out, and dried with supercritical carbon dioxide to obtain n-tetradecyl / ester group co-modified silica airgel.

[0038] Take 50 parts of polypropylene, 15 parts of ultra-high molecular weight polypropylene and 3 parts of n-tetradecyl / ester-based co-modified silica airgel, mix them, and use a granulator to granulate to obtain master batches;

[0039] Mix the masterbatch obtained above, 50 parts of polypropylene, 1 part of anti-aging agent, 1 part of lubricant, 1 part o...

Embodiment 3

[0041] Mix 1 part of tetraethyl orthosilicate with 8 parts of absolute ethanol, add 4 parts of deionized water and mix evenly, add oxalic acid under stirring to adjust the pH to 2.5 for hydrolysis, then add ammonia water to adjust the pH to 9.5 for condensation to obtain a gel. Said gel was aged, replaced with absolute ethanol, soaked into n-hexadecyl dimethyl chlorosilane concentration of 70g / L and 3-(methacryloyloxy) propyl dimethyl chlorosilane concentration of 60g / L L solution was modified for 2 hours, taken out, and freeze-dried to obtain n-hexadecyl / ester group co-modified silica airgel.

[0042] Take 50 parts of polypropylene, 25 parts of ultra-high molecular weight polypropylene and 5 parts of n-hexadecyl / ester-based co-modified silica airgel, mix them, and use a granulator to granulate to obtain master batches;

[0043] Mix the masterbatch obtained above, 50 parts of polypropylene, 1 part of anti-aging agent, 1.5 parts of lubricant and 2 parts of β-nucleating agent, m...

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Abstract

The invention belongs to the field of lithium ion batteries. The invention relates to the technical field of lithium-ion diaphragms. The invention particularly relates to a high-performance lithium ion battery diaphragm and a preparation method thereof. The invention discloses a lithium ion battery diaphragm. The paint is composed of the following components, the composite material is prepared from, by weight, 100 parts of polypropylene, 10-50 parts of ultra-high molecular weight polypropylene, 1-5 parts of auxiliaries, 0.1-5 parts of nucleating agents and 1-10 parts of long-chain alkyl / estergroup co-modified silicon dioxide aerogel. Wherein the long-chain alkyl / ester group co-modified silicon dioxide aerogel is prepared by taking long-chain alkyl dimethyl chlorosilane and 3-(methacryloxy) propyl dimethyl chlorosilane as modifiers in a conventional silicon dioxide aerogel preparation method. The high-performance lithium ion battery diaphragm disclosed by the invention has the advantages of relatively low density, relatively high heat resistance, good stability in electrolyte, relatively good wettability to the electrolyte, relatively high puncture strength and excellent comprehensive performance.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery diaphragm and a preparation method. Background technique [0002] Today, as environmental pollution becomes more and more serious, lithium batteries have become a major variety of new energy sources and are applied in many products. In the structure of a lithium battery, the diaphragm is one of the key inner components. Its performance determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle, and safety performance of the battery. A diaphragm with excellent performance can improve the performance of the battery. Overall performance plays an important role. [0003] As the requirements for lithium batteries become higher and higher, the requirements for separators are also higher and higher, so a series of improved products have emerged. [0004] Silica airgel is a new type of micro-nano materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525C08J5/22C08L23/12C08K9/06C08K7/26
CPCC08J5/2231C08J2323/12C08K7/26C08K9/06H01M10/0525H01M50/403H01M50/409Y02E60/10
Inventor 曹亚琼
Owner 曹亚琼
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