Manganese dioxide for alkaline cells
AssigneeThe Gillette Company
InventorsStuart M. Davis, William L. Bowden, Peter R. Moses, Thomas C. Richards
Life of this patent
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Abstract
Particulate MnO2, having simultaneously a micropore surface area greater than 8.0 m2/g, desirably between about 8.0 and 13 m2/g and BET surface area of between about 20 and 31 m2/g within the context of an MnO2 having a total intraparticle porosity of between about 0.035 cm3/g and 0.06 cm3/g produces enhanced performance when employed as cathode active material in an electrochemical cell, particularly an alkaline cell. The average pore radius of the meso and macro pores within the MnO2 (meso-macro pore radius) is desirably greater than 32 Angstrom.
Claims17
A manganese dioxide having micropores and meso-macropores, said manganese dioxide having simultaneously a BET surface area between about 20 and 31 m2/g, a micropore area between about 8 and 13 m2/g and an average meso-macro pore radius greater than 32 Angstom.
An electrolytic manganese dioxide product having micropores and meso-macropores, said manganese dioxide having simultaneously a BET surface area between about 20 and 28 m2/g and a micropore area between 8 and 13 m2/g, and an average meso-macropore radius greater than about 32 Angstrom, with the total porosity, based on pores within the manganese dioxide, being between about 0.035 cm3/g and 0.040 cm3/g.
An electrolytic manganese dioxide product having micropores and meso-macropores, said manganese dioxide having simultaneously a BET surface area between about 20 and 30 m2/g and a micropore area between 8 and 13 m2/g, and an average meso-macropore radius greater than about 32 Angstrom, with the total porosity, based on pores within the manganese dioxide, being between about 0.040 cm3/g and 0.045 cm3/g.
An electrolytic manganese dioxide product having micropores and meso-macropores, said manganese dioxide having simultaneously a BET surface area between about 20 and 31 m2/g and a micropore area between 8 and 13 m2/g, and an average meso-macropore radius greater than about 32 Angstrom, with the total porosity, based on pores within the manganese dioxide, being between about 0.045 cm3/g and 0.050 cm3/g.
Dependencies are inferred from the claim text.