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

1990-03-23

1992-04-28

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Having means to accommodate electrode expansion

429164, 429215, 429232, H07M 214, H07M 462

Patent

active

051088525

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 therefor. 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 alloted for it within the cell, with a slight accommodation for height-wise or longitudinal expansion or growth of the cathode of bobbin-type cells, or cross-wise 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 pressure is suggested. Cells in keeping with the present invention are capable of exhibiting high current drain rates, and long cycle life.

REFERENCES:
patent: 2960558 (1960-11-01), Marsal et al.
patent: 4091178 (1978-05-01), Kordesch
patent: 4129686 (1978-12-01), Kaduboski
patent: 4340653 (1982-07-01), Adams
patent: 4629665 (1986-12-01), Matsuo
patent: 4891282 (1990-01-01), Nagaura et al.
Shinoda, Patent Abstracts of Japan vol. 11, No. 237, (E-528) p. 145 (Kokai 62/51164) Mar. 1987.

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