Rechargeable manganese dioxide cathode

Details Rechargeable manganese dioxide cathode Rechargeable manganese dioxide cathode

H - Electricity

01

M

H01M 4/50 (2006.01) H01M 4/30 (2006.01)

Patent

CA 2111757

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% MnO2, 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 4-11 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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