High capacity rechargeable cell having manganese dioxide electro

Details High capacity rechargeable cell having manganese dioxide electro High capacity rechargeable cell having manganese dioxide electro

1994-03-09

1995-06-13

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

Sealed cell having gas prevention or elimation means

429144, 429217, 429224, 429229, H01M 1024

Patent

active

054241456

ABSTRACT:
A rechargeable manganese dioxide/zinc cell is provided, where the cell has high capacity, high volumetric and gravimetric energy densities, high cycle life, and is capable of continued charge-discharge cycles following an overdischarge. The cell has an aqueous electrolyte, with the usual solute of potassium hydroxide, but the solute may also be a mixture of zinc chloride and ammonium chloride. The electrode balance as determined by the ration of the theoretical discharge capacity of the zinc and the theoretical one electron discharge capacity of the manganese dioxide ranges from greater than 65% up to 110%. On the 15th discharge, a cell of the present invention will deliver a discharge capacity of at least 20% of the discharge capacity delivered on the first discharge. A cell according to the present invention is capable of continued charge-discharge cycles after overdischarge or voltage reversal.

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