HYDROGEN STORAGE ALLOY, HYDROGEN STORAGE ALLOY ELECTRODE, NICKEL-HYDROGEN STORAGE BATTERY AND METHOD FOR PRODUCING HYDROGEN STORAGE ALLOY

摘要

PROBLEM TO BE SOLVED: To produce a hydrogen storage alloy suitable for improving the battery life and large current discharging characteristics of a nickel-hydrogen storage battery when used for the negative pole of the nickel-hydrogen storage battery. SOLUTION: The surface of a hydrogen storage alloy particle is coated with a composite body containing a first element of at least one kind selected from the group consisting of nickel and cobalt and a second element of at least one kind selected from the group consisting of yttrium, ytterbium, lanthanum, erbium, bismuth, cerium, praseodymium, neodymium and calcium.