Electrolytic manganese dioxide, process for preparing the same,

Details Electrolytic manganese dioxide, process for preparing the same, Electrolytic manganese dioxide, process for preparing the same,

1996-12-04

1999-02-02

Gorgos, Kathryn

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

205539, 423605, C01G 4502, H01M 450, C25B 100

Patent

active

058662782

ABSTRACT:
An electrolytic manganese dioxide having a composition of MnOx, wherein X is 1.90 to 1.96, an adhesive moisture content of not less than 1.5% by weight as measured according to the procedure specified in JIS, and a content of bound water, eliminative in the temperature range of 120.degree. to 400.degree. C., of not less than 3.0% by weight as measured by gravimetry, a process for preparing the same, and a manganese dry cell comprising a cathode mix comprised of a mixing of the electrolytic manganese dioxide with a conductive acetylene black, preferably a conductive acetylene black having a BET specific surface area of 70 to 2.50 m.sup.2 /g, and an electrolyte composed mainly of zinc chloride and/or ammonium chloride. In the process of preparing the electrolytic manganese dioxide, after electrolysis and during or after neutralization, the manganese dioxide is heated in an aqueous solution at 50.degree. to 100.degree. C. for 12 to 48 hours in the presence of an alkaline ammonium compound.

REFERENCES:
patent: 4728672 (1988-03-01), Yoshinari et al.
patent: 5698176 (1997-12-01), Capparella et al.
Chemical Abstracts, vol. 90, No. 22, May 28, 1979, 175146.
Patent Abstracts of Japan, vol. 6, No. 6, Jan. 14, 1982, JP 56-126263 A, Oct. 3, 1981.
Patent Abstracts of Japan, vol. 15, No. 258, Jun. 28, 1991, JP 3-84864 A, Apr. 10, 1991.
Kolta et al., "Application of the B.E.T. Method to Differentiating Manganese Dioxide Modifications", J. Appln. Chem. Biotechnol., vol. 21, No. 6, Jun. 1971, pp. 154-158.

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