Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Include electrolyte chemically specified and method
Patent
1993-10-01
1995-05-16
Bos, Steven
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Include electrolyte chemically specified and method
429197, 429221, 423558, H01M 614, H01M 452
Patent
active
054159571
ABSTRACT:
A cathode material made of anhydrous ferric sulfate with a hexagonal crystal structure is presented for use in a secondary battery which generates a stable open-circuit-voltage of about 3.6 volts and offers a recharge cycling capacity of over 100 times. The cathode material is obtained by heating hydrous iron sulfate material in a temperature range between 250.degree. and 600.degree. C. to remove the water of crystallization. The secondary battery made with this cathode material provides a long-service life and a stable output voltage economically, because the starting material, iron sulfate, is abundantly available at relatively low cost.
REFERENCES:
patent: Re11238 (1892-04-01), Roberts
patent: 2301103 (1942-11-01), Wilson et al.
patent: 3361596 (1968-01-01), Senderoff et al.
Aselage, T. L., "Multicomponent phase diagrams for battery applications . . . ," J. Electrochem. Soc., 134(8A), Aug. 1987, pp. 1932-1938.
Database WPI, Week 7930, Derwent Pubications Ltd., London, GB: AN 79-55439B and JP-A-54 075 532 (Hitachi K. K.), Jun. 16, 1979.
Arai Hajime
Ichimura Masahiro
Ohtsuka Hideaki
Okada Shigeto
Shibata Masasi
Bos Steven
Nippon Telegraph and Telephone Corporation
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