Manganese dioxide cathode for a rechargeable alkaline cell, and

Details Manganese dioxide cathode for a rechargeable alkaline cell, and Manganese dioxide cathode for a rechargeable alkaline cell, and

1993-04-06

1994-09-13

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Having means to accommodate electrode expansion

429128, 429145, 429164, 429214, 429232, 429206, H01M 462, H01M 218

Patent

active

053467833

ABSTRACT:
This invention relates to rechargeable manganese dioxide cells (usually alkaline cells with zinc anodes or cells having non-aqueous electrolyte and lithium anodes), and particularly to the cathodes therefore. In keeping with the present invention, the cathodes are essentially unconstrained--that is, no cage is used in the cell between the cathodes and the anodes. The cathode is restricted from significantly changing its dimensions during discharge of the cell, when it is inclined to swell--as opposed to the tendency of the cathode to contract during a charge cycle. The cathode substantially fills the entire space allotted for it within the cell, with a light accommodation for height-wise or longitudinal expansion or growth of the cathode of bobbin-type cells, or crosswise expansion or growth of button-type cells. There may be additives in the cathode mix, including particularly conductive fibres of graphite or other conductive materials; and other materials may also be added to the cathode mix, including metallic additives. Methods of manufacture are also provided by the present invention, including compaction and recompaction of the cathode pellet, and a range of compaction pressures is suggested. Cells in keeping with the present invention are capable of exhibiting high current drain rates, and long cycle life.

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Falk & Salkind "Alkaline Storage Batteries", Wiley & Sons (1969) pp. 156 to 159 and pp. 180 to 182 month unknown.
Journal Electrochemical Society, 114 (1967) Boden, pp. 415 to 417.

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