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Polyolefin microporous film

A microporous film and polyolefin technology, applied in structural parts, battery pack parts, electrochemical generators, etc., can solve the problems of lower battery productivity, short circuit, drop, etc., and achieve excellent self-discharge characteristics and compression resistance Effect

Inactive Publication Date: 2019-08-09
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] For example, Patent Document 5 describes that in a polyolefin microporous membrane, when compressed by a press at 90° C. for 5 minutes under a pressure of 2.2 MPa, the film thickness change rate from before compression is greater than 15. %, there is a possibility that a short circuit may occur when used as a battery separator, or the battery productivity may decrease due to a decrease in yield

Method used

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Examples

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Embodiment 1～12

[0173] A polyolefin solution was prepared by melt-kneading the polyolefin resin and the liquid paraffin with the compositions shown in Tables 1 and 2 using a twin-screw extruder. The polyolefin solution was supplied to a T-die from a twin-screw extruder and extruded. The extruded body was cooled while being pulled with a cooling roll to form a gel-like sheet. Simultaneous biaxial stretching or sequential biaxial stretching (first stretching) by a tenter stretching machine at a temperature of 106° C. or higher and 112° C. or lower in both the MD and TD directions of the gel-like sheet is carried out by 5 times. . The stretched gel-like sheet was immersed in a dichloromethane bath, and the liquid paraffin was removed, followed by drying to obtain a dry film. The dry film is stretched 1.40 times or more and 1.90 times or less in the MD direction at a temperature of 90° C. or more and 113° C. or less by a roll stretching method using a batch stretching machine (second stretching...

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Abstract

The present invention addresses the problem of providing a polyolefin microporous film having exceptional self-discharge characteristics when incorporated into a cell as a separator. The present invention solves the above-mentioned problem by a polyolefin microporous film in which the percentage change in film thickness when heated and compressed for 60 minutes at a temperature of 80 DEG C and a pressure of 1 MPa is 0-15% relative to a film thickness of 100% of the polyolefin microporous film prior to heating and compression.

Description

technical field [0001] The present invention relates to polyolefin microporous membranes. Background technique [0002] Microporous membranes are used in various fields such as filters such as filtration membranes and dialysis membranes, separators for batteries, and separators for electrolytic capacitors. Among them, microporous membranes using polyolefins as resin materials are excellent in chemical resistance, insulating properties, mechanical strength, etc., and have shutdown characteristics, and thus have been widely used as separators for secondary batteries in recent years. [0003] Secondary batteries, such as lithium ion secondary batteries, are widely used as batteries for personal computers, cellular phones, and the like because of their high energy density. In addition, secondary batteries are also expected as power sources for motor driving of electric vehicles and hybrid vehicles. [0004] In recent years, along with an increase in the electrode volume due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28B32B5/18B32B27/32C08J9/00H01M2/16H01M50/403H01M50/406H01M50/417H01M50/449H01M50/451H01M50/457H01M50/489H01M50/491H01M50/494
CPCH01M50/40H01M50/403H01M50/417B32B5/18B32B27/32C08J9/00C08J9/28Y02E60/10C08J2323/06C08J2323/10B29K2023/00B29C55/005B29C55/02B29D7/01B29K2105/041B29L2031/3468H01M10/0525H01M50/449H01M50/451H01M50/457H01M50/491H01M50/489H01M50/494H01M50/406C08J2323/02H01M50/411
Inventor 陈燕仔金田敏彥西村直哉
Owner TORAY IND INC
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