H - Electricity – 01 – M
Patent
H - Electricity
01
M
H01M 10/52 (2006.01) H01M 6/02 (2006.01) H01M 10/34 (2006.01)
Patent
CA 2082515
In rechargeable or primary electrochemical cells, hydrogen may evolve. The invention concerns the use of an auxiliary electrode material comprising manganese dioxide and a catalyst as the oxidant providing for the recombination of pressurized hydrogen, for exam- ple, the hydrogen being at pressures ranging from substantially zero gauge pressure up to the relief pressure of the cell. The cell is a sealed cell having a manganese dioxide cathode, a zinc anode and aqueous electrolyte contacting both anode and cathode. The aqueous eletrolyte may be alkaline or it may be ammonium chloride or zinc chloride, or mixtures thereof. The auxiliary electrode material, which may be mixed with the cathode material or be formed into a discrete auxiliary electrode, may optionally comprise a porous substrate, and in any event comprises MnO2 and a catalyst for the recombination of pres- surized hydrogen with the MnO2. The substrate may be carbon black or graphite; the catalyst may be a metal, metal salt or metal oxide of elements such as lead, nickel, titanium, lanthanum, chromium, vanadium, tantalum and catalytically active alloys thereof. Most particularly, the catalyst may be silver, platinum, sil- ver oxide, or silver dioxide.
Kordesch Karl
Oran Erkut
Tomanstchger Klaus
Battery Technologies Inc.
Mccarthy Tetrault Llp
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