The hydrogen storage alloy and nickel hydrogen battery electrode and its manufacturing method

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PROBLEM TO BE SOLVED : To provide a nickel hydrogen storage battery having a long service life and excellent high-rate charge and discharge performance by using a long-life and highly active hydrogen storage electrode for a negative electrode. SOLUTION : Hydrogen storage alloy powder containing a rare earth element, nickel and cobalt as constituent elements, having a mean particle size of 20 to 35 μm and a mass saturation magnetization of 1 to 5 emu/g, and formed with a continuous surface layer on the surface, the surface layer having no cavity and containing Ni and Co having magnetic properties is used as an active material of a hydrogen storage alloy electrode. An oxidation-preventing film having a specific material composition is formed on the surface of the hydrogen storage alloy powder. COPYRIGHT : (C)2006, JPO&NCIPI