Gas-tight, sealed alkaline secondary cell

Details Gas-tight, sealed alkaline secondary cell Gas-tight, sealed alkaline secondary cell

1990-08-17

1992-06-16

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Sealed cell having gas prevention or elimation means

Prevention or elimination means is one of the cell...

502101, 427415, H01M 1052

Patent

active

051224267

ABSTRACT:
An auxiliary electrode for improving the consumption of oxygen in a gas-tight, sealed alkaline secondary cell is comprised of a synthetic nonwoven fabric and a film rolled onto the fabric. The film is a PTFE-bound activated carbon, and the side of the nonwoven fabric receiving the film is first impregnated with an aqueous cellulose ether mixture to develop a three layer structure including a highly porous, hydrophobic layer made of the nonwoven material, left in its original state and facing the electrolyte or a gas supply, a hydrophilic impregnated layer, and a catalytically active hydrophobic consumption layer electrically connected with the cell's negative electrode and constituting the preferred location for oxygen reduction, at the resulting hydrophobic/hydrophilic transition layer. The auxiliary electrode is located outside of the ionic path between electrodes of opposite polarity, but in electron-conducting contact with the negative electrode, excluding the auxiliary electrode from unwanted interaction with the NO.sub.2 /NH.sub.3 --auto-discharge path.

REFERENCES:
patent: 2104973 (1938-01-01), Dassler
patent: 3080440 (1963-03-01), Reutschi et al.
patent: 4518705 (1985-05-01), Solomon et al.
patent: 4925747 (1990-05-01), Kordesch et al.
patent: 4987041 (1991-01-01), Simon

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