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Battery separator with antistatic properties

A technology for battery diaphragms and thin films, which is applied in the field of battery diaphragms, and can solve problems such as unfavorable microporous properties of thin films, thin film defects, and battery failures.

Inactive Publication Date: 2005-11-09
CELGARD LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, during lamination of multilayer films, contaminants can become trapped between layers, which in turn can cause defects in the film
Second, during battery manufacturing, static charges on the film can draw contaminants into the anode / separator / cathode structure (gel roll or prismatic), which can cause the battery to fail
[0006] Finally, not all antistatic agents can be easily added to resins formed into films, or coated on microporous films, because those antistatic agents can adversely affect the microporous properties of the film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] A battery separator comprising a microporous polyolefin film having a block copolymer comprising polyether ester amide monomers. The details of this membrane will be explained in detail below.

[0010] Microporous polyolefin films (also known as microporous membranes) are well known. The film can be purchased from: Celgard Inc. of Charlotte, North Carolina, USA (CELGARD  membranes, single and triple layers); Tonen Chemical Co. of Tokyo, Japan; Asohi Kasei of Tokyo, Japan (HIPORE TM ) and Ube Industries of Tokyo, Japan (U-PORE TM ). Such films can be made by the "dry stretch" (or Celgard) process or the "wet" (or reverse phase) process, or by microparticle stretching.

[0011] The polyolefin film is selected from, but not limited to, polyethylene, polypropylene, polybutene, polymethylpentene, mixtures thereof and copolymers thereof. Preferred polyolefins are polyethylene, blends of polyethylene and copolymers of polyethylene. More preferred polyolefins are polypro...

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Abstract

A battery separator comprising: a microporous polyolefin film having from 0.1% to 50% by weight of a block copolymer including a polyetheresteramide monomer. In this battery separator the polyolefin is selected from the group consisting of: polyethylene, polypropylene, polybutylene, polymethylpentene, mixtures thereof, and copolymers thereof. Preferably the polyolefin is polyethylene, mixtures of polyethylene and copolymers of polyethylene, or polypropylene, mixtures of polypropylene and copolymers of polypropylene and has less than or equal to 5% by weight of the block copolymer. In the battery separator of the invention, the microporous film generally has a thickness of no greater than 200 microns, a porosity in the range of 10 to 90%, and a pore size in the range of 0.005 micron to 1.5 micron.

Description

technical field [0001] The present invention relates to battery separators having antistatic properties. Background technique [0002] Static charges on microporous polyolefin films used as separators in batteries such as rechargeable lithium batteries often cause problems. First, during the manufacture of the separator, electrostatic charges can move or attract contaminants to the membrane. These contaminants can form defects such as spots, pinholes, etc. on the film. Also, during lamination of multilayer films, contaminants can become trapped between layers, which in turn can cause defects in the film. Second, static charges on the film can cause the battery to fail by drawing contaminants into the anode / separator / cathode structure (gel roll or prism) during battery fabrication. The most notable of these failures can cause short circuits in internal circuits. As far as battery manufacturing is concerned, the static charge generated in the dry (ie, low humidity) environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/00H01M50/417H01M50/449H01M50/457H01M50/489H01M50/491
CPCH01M10/052H01M2/1653H01M2/1686Y10T428/249993Y10T428/249978Y02E60/10H01M50/449H01M50/417H01M50/457H01M50/491H01M50/489H01M50/414
Inventor 张正铭K·V·恩谷彦
Owner CELGARD LLC
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