NEGATIVE ELECTRODE ACTIVE MATERIAL FOR NICKEL-HYDROGEN SECONDARY BATTERY

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PROBLEM TO BE SOLVED : To provide a negative electrode active material for a nickel-hydrogen secondary battery arranged so that an alkali aqueous solution is used as an electrolyte, which exhibits a negative electrode activation property without using a rare earth element. SOLUTION : A negative electrode active material for a nickel-hydrogen secondary battery comprises a composition expressed by the following formula : AFe3(SO4)2(OH)6 (where A represents K or Na). SELECTED DRAWING : None COPYRIGHT : (C)2016, JPO&INPIT