| abstract |
A nickel-metal hydride secondary battery (2), wherein an electrode group (22) composed of a positive electrode (24) and a negative electrode (26) overlapping each other through a spacer (28) is accommodated together with an alkaline electrolyte, (2) contains Li, and the total amount of Li in the battery (2) is 15 to 50 mg/Ah when Li is converted into LiOH and calculated as the mass per 1 Ah capacity of the positive electrode; the negative electrode (26) contains Rare earth elements, Mg and Ni rare earth-Mg-Ni based hydrogen storage alloy particles; hydrogen storage alloy particles (44) have rare earth hydroxides (50) as hydroxides of rare earth elements on their surfaces , and its specific surface area is 0.1 to 0.5 m 2 /g. |