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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHiroshi Yoshizawa, Akira Miura, Yoshiaki Nitta, Sachiko Sugihara
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A non-pollution zinc-alkaline battery excellent in storage stability can be obtained by using, in formulation for negative electrode, a zinc alloy which contains at least one element selected from the group consisting of bismuth, lithium, calcium and aluminum which is free from mercury, lead, cadmium, indium and thallium is used as an active material and gallium hydroxide or gallium oxide optimized in a starting material therefor, particle size and weight loss on heat decomposition as an inorganic inhibitor. The storage stability of the battery can be further improved by adding to the above formulation for a negative electrode a proper amount of a surfactant having a polyethylene oxide group in a hydrophilic group and a perfluoroalkyl group in oleophilic group as an organic inhibitor.
A method of manufacturing a zinc-alkaline battery where a zinc alloy which contains at least one element selected from the group consisting of bismuth, lithium, calcium and aluminum and which is free from mercury, lead, cadmium, indium and thallium is used as an active material and gallium hydroxide prepared by subjecting a gallium salt as a starting material to neutralizing treatment in an aqueous solution thereof is contained in an alkaline electrolyte in an amount of 0.005-0.5 wt % based on the zinc alloy.
A method of manufacturing a zinc-alkaline battery where a zinc alloy which contains at least one element selected from the group consisting of bismuth, lithium, calcium and aluminum and which is free from mercury, lead, cadmium, indium and thallium is used as an active material and gallium oxide is contained in an alkaline electrolyte in an amount of 0.005-0.5 wt % based on the zinc alloy.
A method of manufacturing a zinc-alkaline battery where a zinc alloy which contains at least one element selected from the group consisting of bismuth, lithium, calcium and aluminum and which is free from mercury, lead, cadmium, indium and thallium is used as an active material and gallium hydroxide or gallium oxide in an amount of 0.005-0.5 wt % based on the zinc alloy and a surfactant having a polyethylene oxide group in its hydrophilic group and a perfluoroalkyl group in its oleophilic group in an amount of 0.001-0.1 wt % based on the zinc alloy are contained in an alkaline electrolyte.
Dependencies are inferred from the claim text.