Gas-tight, sealed alkaline secondary cell

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

H - Electricity

01

M

319/45, 319/50

H01M 2/14 (2006.01) H01M 4/96 (2006.01) H01M 10/34 (2006.01) H01M 10/52 (2006.01)

Patent

CA 2023467

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 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 NO2/NH3-auto-discharge path.

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