Nickel hydrogen rechargeable battery

摘要

A nickel hydrogen rechargeable battery (2) contains an electrode group (22) made up of a positive electrode (24) and a negative electrode (26) put together with a separator intervening therebetween. The positive electrode (24) includes positive-electrode active material particles (36) each having a base particle (38) composed mainly of nickel hydroxide and a conductive layer (40) that covers the surface of the base particle (38) and is made from a Co compound containing Li. The negative electrode (26) includes a rare earth-Mg-Ni-based hydrogen storage alloy (44) containing a rare-earth element, Mg and Ni. The total amount of Li contained in the battery (2) is set in a range of from 15 to 50 (mg/Ah) on the condition that the Li is converted into LiOH, and that the total amount of Li is found as a mass per Ah of positive electrode capacity.