Composite porous membrane, method for producing composite porous membrane, and battery separator using the composite porous membrane

A technology of a porous membrane and a manufacturing method, which is applied to battery pack parts, chemical instruments and methods, separators/films/diaphragms/spacers, etc. The increase in resistance, the decrease in the adhesion of the heat-resistant resin layer, and the difficulty in ensuring safety, etc., achieve the effect of excellent ion permeability
CN102958694BActive Publication Date: 2015-09-30TORAY IND INC
10 Cites 1 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TORAY IND INC
Publication Date
2015-09-30

Smart Images

  • Figure 1
    Figure 1
Patent Text Reader

Abstract

Disclosed is a composite porous membrane which can achieve both an excellent adhesiveness of a heat-resistant resin layer and a small rise in gas permeation resistance even in the case of further reducing the thickness of membranes to be used, for example, battery separators. Specifically disclosed is a composite porous membrane comprising a porous membrane (A) formed of a polyolefin-based resin and a porous membrane (B) containing a heat-resistant resin, said porous membrane (B) being laminated on said porous membrane (A), wherein said porous membrane (A) has a thickness being within a specific range, an average pore size being within a specific range and a porosity being within a specific range and the thickness of the entire composite porous membrane is within a specific range, characterized in that, in said composite porous membrane, the peel strength at the interface between the specific porous membrane (A) and porous membrane (B) is within a specific range and the difference between the gas permeation resistance of the entire composite porous membrane and the gas permeation resistance of the porous membrane (A) is also within a specific range.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to a composite porous membrane in which a porous membrane comprising a heat-resistant resin is laminated on a porous membrane formed of a polyolefin resin, and particularly relates to a polyolefin-based porous membrane having excellent ion permeability and a heat-resistant It is a composite porous membrane useful as a lithium-ion battery separator because of its excellent adhesion to a permanent resin film. Background technique

[0002] Porous membranes made of thermoplastic resins are widely used as materials for separation, selective permeation and isolation of substances, and the like. For example, battery separators used in lithium secondary batteries, nickel-hydrogen batteries, nickel-cadmium batteries, polymer batteries, separators for electric double layer capacitors, reverse osmosis filtration membranes, ultrafiltration membranes, precision filtration membranes, etc. Used in various filters, moisture-permeable wat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More