NICKEL HYDROGEN SECONDARY BATTERY

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A nickel hydrogen secondary battery 2 accommodates an electrode group 22 including a positive electrode 24 and a negative electrode 26 which are stacked one on top of another through a separator 28, together with an alkaline electrolyte. The battery 2 contains Li, with a total amount of Li in the battery 2 of 15 to 50 mg/Ah, as determined as the mass in terms of LiOH per Ah of the positive electrode capacity. The negative electrode 26 includes particles of rare earth-Mg-Ni-based hydrogen storage alloy which contains a rare earth element, Mg and Ni. The hydrogen storage alloy particles 44 includes, on the surface thereof, a rare earth hydroxide 50 which is the hydroxide of a rare earth element and has a specific surface area of 0.1 to 0.5 m2/g.