Microporous membrane, the membrane preparation and the use as a battery separator membrane
2010
The present invention relates to a microporous film having a high melting temperature and low shutdown temperature, and heat shrinkage at a high temperature. The film was prepared as follows: stretching a sheet containing polymethylpentene, polyethylene and the diluent, and then removing the diluent. The film may be used, for example, a battery separator of a lithium ion battery.
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