| 摘要 |
PROBLEM TO BE SOLVED: To enhance low temperature and high efficiency discharge characteristics by setting a specific surface area of alloy powder of hydrogen storage alloy electrode which can store and discharge hydrogen reversibly in a specific range. SOLUTION: An alloy ingot of MmNi3.8 , Al10.3 , Co0.7 , and Mn0.2 is produced under inert atmosphere by a high frequency induction melting furnace, and a sample is obtained by annealing it at 1000 deg.C. In addition, Mn means mish metal which is a mixture of rare earth elements. This ingot is ground mechanically to a particle with a diameter of not more than 32μm to make hydrogen storage alloy powder. This alloy powder is immersed in acetic acid - sodium acetate buffer aqueous solution heated to 60 deg.C for 30 minutes and after agitating it, it is washed by water and dried to make an alloy powder sample treated by acetic acid. The hydrogen storage electrode is produced by making the alloy sample pasty, filling it in a porous nickel body and pressing it after drying. A specific surface area of the alloy powder used for the electrode is set at 0.2-1.0m<2> /g. As a result, a discharge capacity becomes large in 1C discharge at -20 deg.C.
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