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Separator for electricity storage device

A technology for power storage devices and separators, which is applied to electrical components, lithium batteries, battery pack components, etc. It can solve the problems of CID start-up time and initial charge-discharge efficiency without evaluation, and achieve excellent battery characteristics.

Active Publication Date: 2017-12-08
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Documents 3 and 4, there is no evaluation of the CID start-up time and initial charge-discharge efficiency of batteries using this separator.

Method used

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  • Separator for electricity storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0153] Using a drum mixer, Mv was 45 parts by mass of high-density polyethylene of a homopolymer of 700,000, 45 parts by mass of high-density polyethylene of a homopolymer of 300,000 Mv, and 45 parts by mass of a homopolymer of 400,000 Mv. 10 parts by mass of a mixture (mass ratio = 4:3) of polypropylene and a homopolymer polypropylene with Mv of 150,000, and 0.0495 parts by mass of silica "LP" (manufactured by TOSOH SILICA CORPORATION.) with an average primary particle diameter of 15 nm Parts (500ppm) were dry blended to obtain a polyolefin mixture.

[0154] To 99 parts by mass of the obtained polyolefin mixture, 1 mass of tetrakis-[methylene-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate]methane was added as an antioxidant parts, dry blended again using a drum mixer, thereby obtaining a mixture.

[0155] The resulting mixture was supplied to a twin-screw extruder through a feeder under a nitrogen atmosphere. In addition, liquid paraffin (kinematic viscosity at 37.7...

Embodiment 2

[0159] A polyolefin microporous membrane was obtained in the same manner as in Example 1, except that the extraction conditions in Example 1 were adjusted so that the paraffin content of the microporous membrane obtained by the above measurement method was 1.5 wt%. Various physical properties of the obtained microporous membrane were measured by the methods described above.

Embodiment 3

[0161] A polyolefin microporous membrane was obtained in the same manner as in Example 1, except that the extraction conditions in Example 1 were adjusted so that the paraffin content of the microporous membrane obtained by the above measurement method was 2.0 wt%. Various physical properties of the obtained microporous membrane were measured by the methods described above.

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Abstract

The purpose of the present invention is to provide a method for improving the electrical resistance of a separator, and the safety (CID starting time) and the battery characteristic (initial charge and discharge efficiency) of the electricity storage device provided with the separator. ), and a separator for the electricity storage device, which comprises a polyolefin microporous membrane containing one or more polyethylene, and the microporous film contains more than 1.0 wt% and 2.0 wt% or less of paraffin.

Description

technical field [0001] The present invention relates to a separator for an electrical storage device. Background technique [0002] In recent years, development of non-aqueous electrolyte batteries represented by lithium-ion batteries has been actively carried out. Generally, in a nonaqueous electrolyte battery, a separator including a microporous membrane is disposed between positive and negative electrodes. The separator has the function of preventing direct contact between positive and negative electrodes and allowing ions to permeate through the electrolyte solution held in the micropores. [0003] Usually, as a separator, a polyolefin microporous membrane is used. As the pore-forming material, liquid paraffin, paraffin, or the like was used, and the amount or melting point of the liquid paraffin contained in the separator was measured (Patent Documents 1 and 2). [0004] On the other hand, a current interrupt device (CID, Current Interrupt Device) that mechanically b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/052
CPCH01M10/052H01M50/409Y02E60/10Y02P70/50H01M10/058H01M10/4235H01M50/446H01M50/46H01M50/411H01M50/417H01M50/431C08K3/02C08K2003/023
Inventor 稻垣大助奥田敏章
Owner ASAHI KASEI KK
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