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Polyolefin multilayer microporous membrane and battery separator

A technology of microporous membrane and polyolefin, which is applied in the direction of secondary batteries, battery pack components, separators/films/diaphragms/spacers, etc., can solve the problems of increased shutdown temperature, and achieve the purpose of suppressing heat runaway and fire, Effects of excellent heat resistance, sufficient mechanical strength and shutdown characteristics

Active Publication Date: 2016-10-12
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, microporous membranes containing polypropylene-based resins have a problem that the shutdown temperature is high even though the fusing temperature is high.

Method used

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  • Polyolefin multilayer microporous membrane and battery separator
  • Polyolefin multilayer microporous membrane and battery separator
  • Polyolefin multilayer microporous membrane and battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0215] (1) Preparation of the first polyolefin solution

[0216] Pair by Mw is 2.0×10 6 The ultra-high molecular weight polyethylene (UHPE) is 40% by mass and Mw is 5.6×10 5 100 parts by mass of polyethylene-based resin composed of 60 mass% of high-density polyethylene (HDPE), mixed with tetrakis [methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate ] 0.2 parts by mass of methane was used as an antioxidant to prepare a mixture.

[0217] 25 parts by mass of the obtained mixture was put into a strong mixing type twin-screw extruder, and 75 parts by mass of fluid paraffin [35cSt (40°C)] was supplied from the side feeder of the twin-screw extruder, Melt-kneading was performed at 250 rpm to prepare a first polyolefin solution.

[0218] (2) Preparation of the second polyolefin solution

[0219] Pair by Mw is 5.6×10 5 The high density polyethylene (HDPE) and Mw is 1.6×10 6 100 parts by mass of polyolefin resin composed of 50% by mass of polypropylene (PP), blended with te...

Embodiment 2

[0229] In addition to setting the thickness ratio of the polyolefin three-layer microporous film to 42.5 / 15 / 42.5, setting the angle θ to the cooling roll to 75 degrees, and re-stretching and heat-fixing in the TD direction at a temperature of 127°C. Except stretching 1.6 times, according to the same conditions as in Example 1, a polyolefin three-layer microporous membrane was prepared.

Embodiment 3

[0231] Except that the temperature of the cooling roll is set to 18°C, and the stretching and heat fixing are stretched 1.6 times in the TD direction at a temperature of 125°C, according to the same conditions as in Example 2, a polyolefin three-layer micro porous membrane.

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Abstract

Provided are a polyolefin multilayer microporous membrane and a battery separator having exceptional mechanical strength and heat resistance. This polyolefin multilayer microporous membrane has at least three layers, including a first microporous layer (a surface layer) comprising a polyethylene resin that contains an ultra-high-molecular-weight polyethylene, and a second microporous layer (an intermediate layer) comprising a polyolefin resin that contains a high-density polyethylene and polypropylene, and satisfies the following elements: (I) the piercing strength being 25 g / micrometers or greater, (II) the static coefficient of friction relative to aluminum foil being 0.40 or greater, and (III) the meltdown temperature being 180 DEG C or greater.

Description

technical field [0001] The present invention relates to a polyolefin multilayer microporous film and a battery separator using the same, and more specifically, to a polyolefin multilayer microporous film excellent in mechanical strength, heat resistance, and wettability of an electrolytic solution and its use. Its battery separator. Background technique [0002] Non-aqueous electrolyte secondary batteries represented by lithium-ion secondary batteries are widely used as main power sources for mobile electronic devices and vehicle drive power sources such as hybrid vehicles due to their small size, light weight, and high energy density. In lithium ion secondary batteries, a separator is arranged between a positive electrode and a negative electrode. While preventing the short circuit caused by the contact of the active materials of the two poles, the diaphragm keeps the electrolyte in its pores to form a path for ion conduction. [0003] In recent years, with the increase i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32C08J9/00C08L23/06C08L23/12H01M2/16H01M10/0525H01M50/417H01M50/443H01M50/457H01M50/489H01M50/491H01M50/494
CPCC08L23/06H01M10/0525B01D71/26C08L2203/20C08L2205/02C08L2207/062C08L2207/068B01D67/002B01D67/0027B01D67/003B01D69/12B01D2313/12B01D2325/04B01D2325/22B01D2325/24B01D2325/34Y02E60/10H01M50/417H01M50/443H01M50/457H01M50/491H01M50/494H01M50/489B01D2325/02831B01D2325/02832B01D2325/341B01D71/261B01D71/262C08L23/10C08L23/12B32B5/18B32B5/32C08J9/00B32B2266/025B32B2307/7242B32B27/08B32B27/32B32B2307/308B32B2307/581B32B2307/744B32B2457/10Y02T10/70
Inventor 三浦由起子光冈秀人洼田隆
Owner TORAY IND INC
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