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

一种微多孔膜、聚乙烯的技术，应用在电池、二次电池、电池组零部件等方向，能够解决变形小等问题

Active Publication Date: 2008-08-20
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the microporous membranes in each of these documents cannot be said to have reached the range of satisfying mechanical properties and shutdown speed, and the deformation during compression is also small.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0157] (1) Production of the first microporous membrane

[0158] The mass average molecular weight (Mw) is 2.0×10 6 20% by mass of ultra-high molecular weight polyethylene (UHMWPE) and Mw of 3.5×10 5 In 100 parts by mass of a polyethylene composition composed of 75% by mass of high-density polyethylene (HDPE), as an antioxidant, dry-mixed tetra[methylene-3-(3,5-di-tertbutyl-4- Hydroxyphenyl)-propionate] methane 0.2 parts by mass. Among them, the melting point measured for the polyethylene composition composed of UHMWPE and HDPE was 135°C, and the crystal dispersion temperature was 90°C.

[0159] The Mw of UHMWPE and HDPE is determined by gel permeation chromatography (GPC) under the following conditions.

[0160] · Measuring device: GPC-150C manufactured by Waters Corporation

[0161] ·Column: Shodex UT806M manufactured by Showa Denko Corporation

[0162] ·Column temperature: 135℃

[0163] ·Solvent (mobile phase): o-dichlorobenzene

[0164] ·Solvent flow rate: 1.0ml / min

[0165] ·...

Embodiment 2

[0177] A polyethylene double-layer microporous membrane was produced in the same manner as in Example 1, except that the mixing ratio of the resin mixture for the second porous layer was 25% by mass of UHMWPE, 55% by mass of HDPE, and 20% by mass of PBT.

Embodiment 3

[0179] The first and second microporous membranes were produced so that the thickness of each was 50μm, and the first microporous membrane was laminated on both sides of the obtained second microporous membrane and joined, except that it was the same as in Example 1 To make a polyethylene three-layer microporous membrane.

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PUM

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Abstract

The polyethylene multilayer microporous film of the present invention has: (a) a first porous layer made of polyethylene resin; (b) a second porous layer containing polyethylene resin and melting point or glass A heat-resistant resin having a transformation temperature of 170° C. or higher, and the heat-resistant resin is dispersed in the form of fine particles in the polyethylene-based resin, and fibrils composed of the polyethylene-based resin have the heat-resistant The fine particles of the permanent resin are fine pores with core cracks, and the polyethylene multilayer microporous membrane has shut-off properties, ablation properties, permeability, mechanical strength, heat shrinkage resistance, and compression resistance in an excellent harmony.

Description

Technical field [0001] The present invention relates to a layer containing a heat-resistant resin other than polyethylene resin and polypropylene, and has shutdown characteristics, meltdown characteristics, permeability, mechanical strength, heat shrinkage resistance, and compression resistance A polyethylene multilayer microporous film with excellent coordination, a battery separator composed of the polyethylene multilayer microporous film, and a battery provided with the same. Background technique [0002] Polyolefin microporous membranes are widely used in battery separators including lithium batteries, electrolytic capacitor separators, moisture-permeable waterproof clothing, and various filter membranes. When a polyolefin microporous membrane is used as a battery separator, its performance is closely related to the characteristics, productivity, and safety of the battery. Therefore, in particular, the separator for lithium-ion batteries is required to have excellent mechanic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B5/32H01M2/16H01M50/417H01M50/42H01M50/423H01M50/426H01M50/429H01M50/491H01M50/494
CPCB32B27/32H01M10/0525H01M2200/10H01M2300/0025Y10T428/249978Y02E60/10H01M50/44H01M50/429H01M50/417H01M50/491H01M50/42H01M50/423H01M50/426H01M50/494B32B5/32H01M50/411Y02P70/50
Inventor 菊地慎太郎泷田耕太郎
Owner TORAY IND INC
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