Porous film and method of producing the same
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United States of America Patent
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Mar 24, 1998
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N/A
app pub date -
Jan 17, 1997
filing date -
Mar 15, 1995
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Abstract
A porous film of a laminate structure, comprising a porous inner layer comprising polyethylene as the essential component, and having formed on both surfaces thereof a porous outer layer comprising polypropylene and having a Vickers hardness of 10 or more. The porous film is suitable as a separator for a lithium battery, and when the porous film is superposed with a positive electrode and a negative electrode, the film is difficult to be scratched and perforated at the assembly of cells. A production method of the porous film is also provided.
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