MICROPOROUS FILMS

摘要

The invention provides microporous polymer films which comprise a halopolymer in which the repeat units are -(Cn H2n)- and -(Cm X2m)-, where each X independently represents fluorine or chlorine and the values of n and m are more than one and less than six. The films of the invention can be suitable for use in high temperature applications and can be substantially inert to certain chemically aggressive substances such as alkali and alkaline earth metals. The films find particular application in electrochemical cells comprising a lithium anode and thionyl chloride electrolyte.