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AssigneeShin-Etsu Chemical Co., Ltd.
InventorsTakao Maeda, Satoshi Shima, Naofumi Shinya
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An object of the present invention is to provide a hydrogen absorbing alloy which can improve a high rate discharge property while suppressing particle size reduction, exhibits cycle life characteristics equal to or higher than those of conventional alloys even when its cobalt content is decreased, and has a high capacity. Specifically, the present invention provides a hydrogen absorbing alloy having a CaCu5 type crystal structure in its principal phase, wherein the La content in the alloy is in the range of 24 to 33% by weight and the Mg or Ca content in the alloy is in the range of 0.1 to 1.0% by weight, as well as the aforesaid alloy wherein the Co content in the alloy is not greater than 9% by weight.
A hydrogen absorbing alloy having a CaCu5 type crystal structure in its principal phase, comprising La in the range of 24 to 33% by weight in the alloy, and Mg or Ca in the range of 0.1 to 1.0% by weight in the alloy.
A hydrogen absorbing alloy having a CaCu5 type crystal structure in its principal phase, comprising Mg and having a-axis length of 4.990 to 5.050 Å and c-axis length of 4.030 to 4.070 Å for the lattice constants in the CaCu5 type crystal structure.
A method for manufacturing a hydrogen absorbing alloy having a CaCu5 type crystal structure in its principal phase, characterized in that a Mg-supply material is added to dissolution of component elements for hydrogen absorbing alloy in an amount of 0.1 to 1.0% by weight in an entire hydrogen absorbing alloy.
Dependencies are inferred from the claim text.