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Microporous polyolefin film, separator for battery, and production processes therefor

A microporous membrane and polyolefin technology, which is applied in battery pack parts, chemical instruments and methods, membranes, etc., can solve problems such as membrane rupture, and achieve the effect suitable for high capacity.

Active Publication Date: 2020-08-14
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the internal temperature of the battery continues to rise after the pores are closed for some reason, membrane rupture may occur due to shrinkage of the polyethylene microporous membrane
This phenomenon is not limited to microporous membranes made of polyethylene. In the case of microporous membranes using other thermoplastic resins, this phenomenon cannot be avoided if the temperature is higher than the melting point of the resin.

Method used

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  • Microporous polyolefin film, separator for battery, and production processes therefor
  • Microporous polyolefin film, separator for battery, and production processes therefor
  • Microporous polyolefin film, separator for battery, and production processes therefor

Examples

Experimental program
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Effect test

preparation example Construction

[0085] (a) Preparation process of polyethylene resin solution

[0086] As the preparation process of the polyethylene resin solution, after adding a molding solvent to the polyethylene resin, melt kneading is carried out to prepare a polyolefin resin solution; as a melt kneading method, for example, Japanese Patent Publication No. 06-104736 and Japanese A method using a twin-screw extruder described in Japanese Patent No. 3347835. Since the melt-kneading method is known, description thereof will be omitted.

[0087] The molding solvent is not particularly limited as long as it can sufficiently dissolve polyethylene. For example, aliphatic or cyclic hydrocarbons such as nonane, decane, undecane, dodecane, and liquid paraffin, or mineral oil fractions having a boiling point corresponding to them, etc., are preferably non-volatile such as liquid paraffin. solvent.

[0088]The total amount of the polyethylene resin and the molding solvent is set to 100 parts by weight, and the ...

Embodiment 1

[0180] (Manufacture of polyolefin microporous membrane)

[0181] At a mass average molecular weight of 2.5×10 by 40% by mass 6 Ultra-high molecular weight polyethylene and 60% by mass with a mass average molecular weight of 2.8×10 5 In 100 parts by mass of a composition composed of high-density polyethylene, 0.375 parts by mass of tetrakis [methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate] methane was dry mixed, Made into polyethylene composition. 30 parts by weight of the obtained polyethylene composition was charged into a twin-screw extruder. Furthermore, 70 parts by weight of liquid paraffin was supplied from the side feeder of the twin-screw extruder, and melted and kneaded to prepare a polyethylene resin solution in the extruder. Next, the polyethylene resin solution is extruded at 190°C from a die provided at the front end of the extruder, and is drawn out by a cooling roll that maintains the temperature of the internal cooling water at 25°C, while forming ...

Embodiment 2

[0185] Except having set the width to 150 mm, it carried out similarly to Example 1, and obtained the polyolefin microporous membrane B which is a base material for coating.

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Abstract

The invention relates to a microporous polyolefin film, a separator for a battery, and production processes therefor. A microporous polyolefin film has a width of 100 mm or greater and a width of variations in transverse-direction F25 value of 1 MPa or less, and is suitable for forming a porous layer reduced in thickness unevenness. The term F25 value means a value obtained by examining a test piece using a tensile tester to measure a load at the time when the test piece has elongated by 25% and dividing the load by the cross-sectional area of the test piece.

Description

[0001] This application is a Chinese invention patent application No. 201580060950.6 (PCT application number PCT / JP2015 / 081183) with an application date of November 5, 2015 and an invention title of "Polyolefin Microporous Membrane, Battery Separator and Manufacturing Method thereof" divisional application. technical field [0002] The present invention relates to a polyolefin microporous membrane, a battery separator having a porous layer on at least one side of the polyolefin microporous membrane, and a method for producing the same. Background technique [0003] Thermoplastic resin microporous membranes are widely used as separation membranes for substances, selective permeation membranes, separator membranes, and the like. For example, lithium-ion secondary batteries, nickel-metal hydride batteries, nickel-cadmium batteries, battery separators used in polymer batteries, separators for electric double-layer capacitors, reverse osmosis filtration membranes, ultrafiltration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J9/28C08J7/04C08J9/36C08L23/06C08K5/134H01M2/16H01M50/403H01M50/406H01M50/414H01M50/417H01M50/42H01M50/449H01M50/457H01M50/491
CPCY02E60/10B01D67/0013B01D67/0025B01D69/02B01D69/12B01D71/26B01D71/34B01D71/40B01D2325/04B32B5/32B32B27/32C08F16/06C08F20/06C08J9/28H01M50/403H01M50/406H01M50/414H01M50/417H01M50/42H01M50/449H01M50/457H01M50/491B01D69/1213B01D69/1214B01D71/381B01D71/38B21B1/0815B29C48/0018B29C48/08B29C55/12B29C55/18B29K2105/041C08J5/2231H01M50/411
Inventor 水野直树菅田正美
Owner TORAY IND INC
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