NICKEL-METAL HYDRIDE BATTERY AND METHOD FOR PRODUCING HYDROGEN STORAGE ALLOY

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It is an object of the present invention to improve the cycle performance in a nickel-metal hydride battery using a rare earth-Mg-Ni type alloy. The present invention provides a nickel-metal hydride battery having a negative electrode including an La-Mg-Ni based hydrogen absorbing alloy, wherein the hydrogen absorbing alloy has a crystal phase having Gd2Co7 type crystal structure and contains calcium.