Flexible battery separator and method of production
Abstract
Abstract METHOD FOR PRODUCING AN IMPROVED BATTERY SEPARATOR, IN THE FORM OF A FLEXIBLE MICROPOROUS SEPARATOR FILM CONTAINING PARTICLES OF AN INROGANIC SUBSTANCE IN AN ORGANIC BINDER SUCH SEPARATOR HAVING GOOD IONIC CONDUCTIVITY AND GOOD THERMAL AND ALKALI RESISTANCE, BY MIXING AN AQUEOUS DISPERSION OF A SUBSTANCE WHICH IS INSOLUBLE IN WATER AND IN ALKALI AND OF FINE PARTICLE SIZE E.G. ZIRCONIA WITH AN AQUEOUS DISPERSION OF A LATEX TYPE POLYMER SUCH AS A FLUOROCARBON POLYMER, E.G. POLYTETRAFLUOROETHYLENE, CASTING A FILM OF SUCH MIXTURE DRYING THE FILM, SINTERING THE DRIED FILM, AND FORMING A FILM OF SAID POLYMER WITH PARTICLES OF SUCH SUBSTANCE, E.G. ZIRCONIA, UNIFORMLY DISTRIBUTED IN SUCH FILM, AND PREFERABLY INCLUDING TREATING SUCH SINTERED FILM WITH ALKALIS, PREFERALY AQUEOUS KOH, TO SUBSTANTIALLY INCREASE THE CONDUCTIVITY OF SUCH FILM. THE RESULTING FLEXIBLE SEPARATOR FILM PRODUCED BY SUCH PROCESS.
Inventors
- 👤 M Strier
- 👤 J Smatko
Bibliographic Details
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