Patent ID: 6602629
Filing Date: 2003-08-05
Classification: B32B,C22C,H01M,Y02E,Y02P

Abstract:
A button electrochemical cell comprising:an anode having an active material comprising a low gassing zinc composition; and an anode cup having a sealing surface for contact with a seal and an anode contacting surface for contact with said anode, said sealing surface of said anode cup having thereon no non-in situ-deposited metal with a hydrogen overvoltage higher than that of copper, and said anode contacting surface having thereon a layer of non-in situ-deposited metal with a hydrogen overvoltage higher than that of copper; wherein said zinc composition produces 0.5 cc or less gas per 5 grams of zinc composition when tested for 24 hours at 71Â° C. in aqueous solution of 45 weight percent KOH and the electrochemical cell is free of added mercury.