添加Al对稀土系贮氢电极合金高温性能的影响

EFFECTS OF Al-SUBSTITUTION ON THE ELECTROCHEMICAL PERFORMANCE OF RARE EARTH BASED HYDROGEN STORAGE ALLOY AT HIGH TEMPERATURE

系统研究了添加Ａｌ的贮氢电极合金在高温下的电化学性能．结果表明：以Ａｌ部分替代稀土系贮氢合金中的Ｎｉ，使氢化物电极的平衡分解压降低，使高温下的放电容量升高，自放电降低、改善高倍率放电性能和循环稳定性．

In order to improve performance of hydrogen storage alloy at high temperature, Al was used to partly substitute Ni in MINi3.8(CoMn)1.2 alloy and the electrode performance of the newly de- signed alloys were examined systematically. With part replacement of Ni by Al in MINi3.8(MnCo)1.2, the plateau pressure of the metal hydride decreased. The discharge capacity at high temperature increased, the self discharge reduced, the high rate dischargeability and the cycling durability were improved con- siderably. MINi3.5(MnCo)1.2Al0.3 and MINi3.4(MnCo)1.2Al0.4, whose discharge capacities were larger than that at room temperature, showed good comprehensive performance at high temperature.