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Polyethylene multilayer microporous membrane, battery separator using same, and battery

A polyethylene and microporous technology, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of insufficient electrolyte absorption and compression resistance of microporous membranes, and achieve safety and Excellent results for productivity

Inactive Publication Date: 2008-06-25
东丽东燃机能膜合同会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrolyte absorption and compression resistance of the microporous membranes of JP-A-2004-149637 and JP-A-2004-161899 are insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0145] (Preparation of the first polyethylene solution)

[0146] The mass average molecular weight (Mw) is 2.0×10 6 The ultra-high molecular weight polyethylene (UHMWPE) 20% by mass and Mw is 3.5×10 5 In 100 parts by mass of a polyethylene composition composed of 80% by mass of high-density polyethylene (HDPE), as an antioxidant, dry-blended tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxybenzene) (Yl)-propionate] methane 0.2 parts by mass to prepare a mixture. Among them, the melting point measured for the polyethylene (PE) composition composed of UHMWPE and HDP was 135°C, and the crystal dispersion temperature was 100°C.

[0147] The Mw of UHMWPE and HDPE was obtained by gel permeation chromatography (GPC) under the following conditions.

[0148] ·Measurement device: GPC-150C manufactured by Waters Corporation

[0149] ·Column: Shodex UT806M manufactured by Showa Denko Co., Ltd.

[0150] ·Column temperature: 135℃

[0151] ·Solvent (mobile phase): o-dichlorobenzene

[0152] ·Sol...

Embodiment 2

[0163] Except that the heat-relaxed film was stretched again to 1.2 times in the transverse direction (TD) at 125°C, the same procedure as in Example 1 was carried out to produce a polyethylene multilayer microporous film.

Embodiment 3

[0165] The simultaneous biaxially stretched film was heat-fixed at 123°C for 10 minutes and then washed, and except that it was washed in the same manner as in Example 2, a polyethylene multilayer microporous film was produced.

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PUM

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Abstract

A multi-layer, microporous polyethylene membrane having at least three layers comprising (a) a first microporous layer amount of a polyethylene resin and constituting at least both surface layers, and (b) at least one second microporous layer made of a polyethylene resin, a heat-resistant resin having a melting point or glass transition temperature of 150°C or higher and a filler, and sandwiched by both surface layers.

Description

Technical field [0001] The present invention relates to a polyethylene multilayer microporous film with excellent balance of permeability, mechanical properties, dimensional stability, shutdown properties, meltdown properties, compression resistance and electrolyte absorption, and uses Its battery separator and battery. Background technique [0002] Polyolefin microporous membranes are widely used in battery separators for lithium batteries, separators for electrolytic capacitors, various filters, moisture-permeable waterproof clothing, and various filter membranes. In the case of using a polyolefin microporous film as a separator for a battery, its performance greatly affects the characteristics, productivity, and safety of the battery. In particular, in lithium ion battery separators, in addition to excellent mechanical properties and permeability, in order to prevent battery heating, ignition, rupture, etc. caused by short circuit of external circuit, overcharge, etc., it is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32H01M2/16H01M50/417H01M50/423H01M50/426H01M50/451H01M50/457H01M50/489H01M50/491H01M50/494
CPCH01M2/1686B32B2457/10B32B27/32H01M10/4235B32B2250/40B32B2250/24B32B2270/00H01M2/1653Y10T428/24998Y02E60/10H01M50/417H01M50/489H01M50/451H01M50/457H01M50/491H01M50/423H01M50/426H01M50/494H01M50/411H01M50/449
Inventor 菊地慎太郎泷田耕太郎山田一博中村悌二河野公一
Owner 东丽东燃机能膜合同会社
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