| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery with superior mass current discharge characteristic by using a misch metal consisting of a specific elements as a site A, and at a site B AB5 type hydrogen storage alloy powders consisting of specific elements containing Co is stirred in a lithium hydroxide aqueous solution of a heated specific concentration, and made to elute a cobalt component from powders in the solution, and deposit it on a powder surface. SOLUTION: A misch metal has a site A which is La, Ce, Pr, Nd, and Sm and a B site which is Ni, Co, Mn, and Al. A concentration of a lithium hydroxide aqueous solution is 1 to 4 mol/l, and a liquid temperature is preferably 80 to 120 deg.C. Reaction activity of alloy powders is enhanced from elution in cobalt solution and deposition onto its powder surface by a stirring process in a heated lithium hydroxide aqueous solution, and discharge characteristic is improved. A secondary battery is constituted of a negative electrode composed of hydrogen storage alloy powders, a positive electrode having nickel hydroxide as an active substance, a separator for holding an alkali electrolyte, and an alkali electrolyte. |
