Hydrogen storage electrode

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PURPOSE : To suppress increase in internal pressure in a battery and enhance charge/discharge characteristics by forming a hydrogen storage electrode by adding rare earth element powder or its compound powder to a hydrogen storage alloy capable of absorbing/releasing hydrogen. CONSTITUTION : A prescribed amount of misch metal Mm which is a composite body of rare earth elements is weighed, and alloyed in a high frequency furnace in an inert atmosphere. The alloy obtained is mechanically crushed, CeO2 powder is mixed, then a thickening agent is added to form pasty mixture, and the pasty mixture is filled in a nickel fiber substrate, dried, and pressed to form a hydrogen storage electrode. The hydrogen storage electrode has excellent charge/discharge characteristics compared with the conventional electrode, and increase in internal pressure in the battery is remarkably suppressed.