University of Ottawa

Brian Conway

William A Adams

Srinivasa Sourirajan

Geeta Chowdhury

Lijun Bai

De Yang Qu

The present invention relates to film composite membranes for use as battery separators or coatings on electrodes.

Thin film composite membrane as battery separator

A method of enforcing a regular manganese dioxide cathode to become gradually and substantially rechargeable is described, where the cathode capacity is increased towards the theoretical capacity of the cathode. The method involves mixing 20-51 wt % MnO.sub.2, 5-25 wt % metallic bismuth and 30-70 wt % graphite powder to form a homogenous mixture, subjecting the mixture to a pressing force to form an electrode and subjecting the electrode to successive discharge/charge cycles at a rate where the cathode capacity becomes greater than 75% of the theoretical capacity after 4-7 cycles. The method provides for a simple and inexpensive way of forming a rechargeable manganese dioxide cathode without complex chemical synthesis.

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Ottawa, Canada

Brian Conway