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AssigneeSanyo Electric Co., Ltd.
InventorsYoshinori Matsuura, Mitsuzo Nogami, Mamoru Kimoto, Nobuyuki Higashiyama, Yasushi Kuroda, Ikuo Yonezu, Koji Nishio, Toshihiko Saito
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A hydrogen-absorbing alloy electrode for metal hydride alkaline batteries uses as hydrogen-absorbing material a powder of a rare earth element-nickel hydrogen-absorbing alloy obtained by pulverizing thin strips of said alloy prepared by single roll process and having an average thickness of 0.08 to 0.35 mm and a minimum size of crystal grains present in the roll-surface size of at least 0.2 .mu.m and a maximum size of crystal grains in the open-surface side of not more than 20 .mu.m. A process for producing the above electrode is also provided. The electrode can provide, when used as negative electrode, metal hydride alkaline batteries which are excellent in both high-rate discharge characteristics at an initial period of charge-discharge cycles and charge-discharge cycle characteristics.
A hydrogen-absorbing alloy electrode for metal hydride alkaline batteries, comprising a powder of a rare earth element-nickel hydrogen-absorbing alloy obtained by pulverizing strips of said alloy prepared by a single roll process and having a laminar structure of alternating layers of high concentration of rare earth elements and low concentration of rare earth elements, and having an average thickness of 0.08 to 0.35 mm and a minimum size of crystal grains present in the roll-surface side of at least 0.2 .mu.m and a maximum size of crystal grains in the open-surface side of not more than 20 .mu.m, wherein the size of crystal grains is the sum of the thicknesses of two neighboring layers of high concentration of rare earth elements and low concentration of rare earth elements.
A hydrogen-absorbing alloy electrode for metal hydride alkaline batteries, comprising a powder of an Mm.Ni.Co.Al.Mn alloy represented by the general formula MmRx, wherein Mm represents misch metal;
A process for producing hydrogen-absorbing alloy electrodes for metal hydride alkaline batteries, which comprises the steps of:
A process for producing hydrogen-absorbing alloy electrodes for metal hydride alkaline batteries, which comprises the steps of:
Dependencies are inferred from the claim text.