Patent ID: 8119284

Claim:
A nickel-metal hydride battery comprising: a positive electrode; and a negative electrode formed from an AB 5 hydrogen-absorbing alloy including: an A element composed of Misch metal; and a B element mainly composed of nickel, with the nickel being partially replaced by at least one further element including cobalt; wherein the AB 5 hydrogen-absorbing alloy is formed to satisfy at least the conditions of: a mol ratio of the B element relative to the A element being 5.25 or greater; the amount of cobalt for 1 mol of the A element being 0.15 mol to 0.25 mol; and the AB 5 hydrogen-absorbing alloy having a half-width ratio, which is obtained through X-ray diffraction and indicates the ratio of a peak half-width of a (002) plane relative to a peak half-width of a (200) plane, of 1.3 or greater and less than 1.7.