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An aromatic polyamide composite separator, its preparation method and secondary battery

A technology of aromatic polyamide and composite diaphragm, which is applied in the direction of lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., and can solve the problems of lithium secondary batteries such as reduced safety, limited temperature resistance, combustion or explosion, etc. Achieve good thermal and chemical stability, strong solubility, and increase safety

Active Publication Date: 2019-06-18
MICROMACRO ADVANCED MEMBRANE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melting point of the polyolefin material is 160°C or lower, and the separator melts before the shutdown effect is obtained, which may cause a large-area short circuit between the electrodes, and the heat generated will cause the electrolyte to vaporize, causing combustion or explosion
The limitation of polyolefin diaphragm material is: limited temperature resistance, usually lower than 160°C, which reduces the safety of lithium secondary batteries, and is not suitable as a lithium ion power battery diaphragm for electric vehicles
Some domestic research institutes have applied aramid fibers to lithium-ion battery separators. For example, in the Chinese patent with the publication number CN103242556A and the Chinese patent with the announcement number CN202384420U, aromatic polyamide polymer fibers are coated on the surface of the polyolefin separator. These Applicability of the method is greatly compromised due to its limitation to polyolefin substrates

Method used

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  • An aromatic polyamide composite separator, its preparation method and secondary battery
  • An aromatic polyamide composite separator, its preparation method and secondary battery
  • An aromatic polyamide composite separator, its preparation method and secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0059]Polymerize in a reaction kettle to obtain 4500 g of polym-phenylene isophthalamide solution, the solvent is DMAC, and the mass percent concentration of the polymer is 9%. N-methyl-N-propylpyrrolium tetrafluoroborate 2300g and absolute ethanol 700g were mixed in a stirred tank to obtain an ionic liquid solution. The ionic liquid solution and the polym-phenylene isophthalamide solution prepared in the previous stage were respectively injected into the stirring tank and mixed evenly, and then injected into the coating tank. Immerse the glass fiber cloth with a thickness of 12 μm and a single filament diameter of 4.5 μm into the mixed solution in the coating tank, take it out from the mixed solution and then squeeze it through a pressure roller to ensure a uniform thickness of the membrane. The coated film enters the gel bath, the gel bath is a mixed solvent of water and DMAC, wherein the mass percentage of water is 50%, the temperature of the gel bath is 60°C, and the gel t...

Embodiment 2

[0063] Same as Example 1, the difference is that N-methyl-N-propylpyrrolium tetrafluoroborate 2300g and deionized water 230g are mixed in a stirred tank to obtain an ionic liquid solution.

Embodiment 3

[0065] Same as Example 2, the difference is that the gel bath is water, the gel bath temperature is 80°C, the gel time is 10 seconds, and the drying temperature is 150°C.

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Abstract

The invention relates to an aromatic polyamide composite separator, its preparation method and a secondary battery. The aromatic polyamide composite separator involved in the present invention includes glass fiber and aromatic polyamide. The thermal shrinkage rate of the composite separator at 300°C is less than 3%. The invention also provides a method for preparing an aromatic polyamide composite separator. The composite separator of the present invention has excellent mechanical properties and heat resistance, and is particularly suitable for secondary batteries.

Description

Technical field [0001] The invention relates to an aromatic polyamide composite separator, its preparation method and a secondary battery. Background technique [0002] As an outstanding representative of the new energy industry, lithium secondary batteries have shown explosive growth in recent years. Especially in the field of electric vehicles, power batteries with high-rate charging and discharging performance are in short supply. With the extensive application of lithium secondary batteries in electric vehicles, battery safety has become one of the important standards for power battery inspection. Among them, the lithium battery separator is the first "line of defense" to ensure the safety of single cells. The separators currently widely used in lithium batteries are mainly polyolefin melt-stretched separators. The closing effect of these materials helps to improve safety when the battery heats up. [0003] However, when an internal short circuit occurs in the battery,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M50/403H01M50/423H01M50/431H01M50/437H01M50/44H01M50/454H01M50/489H01M50/491H01M50/494
CPCH01M10/052H01M50/44H01M50/403H01M50/491H01M50/423H01M50/489H01M50/437H01M50/494Y02E60/10Y02T10/70C08L77/10C08L81/10C08L2203/20
Inventor 孙庆津李翔
Owner MICROMACRO ADVANCED MEMBRANE CO
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