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Separator

A technology of heat-resistant layer and laminated porous film, which is applied in the direction of electrical components, structural parts, battery pack parts, etc., can solve the problem of unsatisfactory capacity of non-aqueous electrolyte secondary batteries, and achieve excellent high-current discharge characteristics, durability high heat effect

Inactive Publication Date: 2010-01-06
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although the spacer obtained above has few problems in terms of its air permeability, the nonaqueous electrolyte secondary battery using the spacer is not satisfactory in terms of its electric capacity.

Method used

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Embodiment 1

[0111] (1) Manufacture of coating liquid

[0112] After dissolving 272.7 g of calcium chloride in 4200 g of NMP, 132.9 g of p-phenylenediamine was added and completely dissolved. To the obtained solution, 243.3 g of terephthaloyl chloride (hereinafter, abbreviated as TPC) was slowly added for polymerization to obtain a para-aramide, which was further diluted with NMP to obtain a para-aramide solution (A) with a concentration of 2.0% by weight. To 100 g of the obtained para-aramid solution, 4 g of alumina powder (Sumiko Random, AA03 manufactured by Sumitomo Chemical Co., Ltd., AA03, number average particle diameter: 0.3 μm) containing nearly spherical particles was added as a filler, mixed, and treated with a nanomachine three times. , and further filtered through a 1000-mesh metal mesh, degassing was performed under reduced pressure to obtain a slurry coating solution (B). The weight of alumina powder (filler) was 67% by weight relative to the total weight of para-aramid and ...

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PUM

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Abstract

Provided is a separator composed of a multilayer porous film wherein a heat resistant layer containing a heat resistant resin and a shutdown layer containing a thermoplastic resin are laminated. The thickness of the heat resistant layer is 1 mu m or more but not more than 10mu m, and the heat resistant layer contains a filler composed of particles which are substantially spherical.

Description

technical field [0001] The invention relates to a spacer. Specifically, it relates to a separator for a nonaqueous electrolyte secondary battery. Background technique [0002] The separator includes a porous film having micropores, and is used in nonaqueous electrolyte secondary batteries such as lithium ion secondary batteries and lithium polymer secondary batteries. In non-aqueous electrolyte secondary batteries, it is very important to cut off the current and prevent excessive current flow (shut down) when an abnormal current flows in the battery due to a short circuit between the positive electrode and the negative electrode. , to seek the following characteristics: When the normal operating temperature is exceeded, the characteristics of breaking the circuit (blocking the micropores of the porous membrane) as much as possible at a low temperature; after the circuit is broken, even if the temperature inside the battery rises to a certain high temperature, the temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/417H01M50/423H01M50/434H01M50/449H01M50/489H01M50/491
CPCY02E60/12H01M10/4235H01M2/1686Y02E60/122H01M2/1646H01M2/348H01M2/1653H01M10/052H01M2/166Y02E60/10H01M50/446H01M50/449H01M50/581H01M50/417H01M50/491H01M50/489H01M50/434H01M50/423B32B27/08H01M50/451H01M50/431H01M50/443B32B27/32
Inventor 西田裕纪筱原泰雄佐藤裕之
Owner SUMITOMO CHEM CO LTD