| 摘要 |
PURPOSE:To check a capacity drop as well as a discharge voltage drop due to charge and discharge cycles, by adding a zinc compound consisting of cadmium hydroxide and/or zinc or zinc hydroxide, zinc oxide and such like to a positive pole active material mixture. CONSTITUTION:Making nickel hydroxide a main body, an active material mixture inclusive of metallic nickel powder and metallic cobalt powder is used for a positive pole being filled up with a spongelike nickel base plate, while the active material mixture is made up so as to include more than one type of zinc hydroxide, zinc and zinc oxide by more than 2wt% to nickel hydroxide at a zinc hydroxide conversion value, cadmium hydroxide by more than 2wt% to the nickel hydroxide by more than 2wt% to the nickel hydroxide and the total amount of both by less than 20wt% to the nickel hydroxide. The said cadmium hydroxide prevents a capacity drop due to charge and discharge cycles while zinc hydroxide, zinc and a zinc oxide all also prevent the capacity drop and likewise have such an action as capable of raising the discharge voltage. |
