Rechargeable manganese dioxide cathode

Details Rechargeable manganese dioxide cathode Rechargeable manganese dioxide cathode

1994-12-19

1997-08-26

Willis, Jr., Prince

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

429 50, H01M 430, H01M 450

Patent

active

056609531

ABSTRACT:
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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patent: 5424145 (1995-06-01), Tomantschger et al.
Rechargeability of a Chemically Modified MnO.sub.2 /Zn Battery System at Practically Favorable Power Levels -Department of Chemistry, University of Ottawa, Ottawa, Canada J. Electrochem Soc. vol. 140, No. 4, 884-889 (Apr. 1993).
Rechargeable Manganese Oxide Electrodes Part II. Physically Modified Materials, Ford Motor Company, Research Staff, Dearborn, MI USA J. Electrochem Soc. 238 (1987) 93-102.

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