University of Ottawa

De Yang Qu

Lijun Bai

William A Adams

Brian Conway

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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De Yang Qu