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研究了热处理时间对贮氢电极合金La0.7Mg0.3Ni2.45Co0.75Mn0.1Al0.2的微结构与电化学性能的影响。XRD分析结果表明,所有合金均由(La,Mg)Ni3与LaNi5两相构成,热处理并没有使该贮氢合金发生相变。电化学研究结果表明,随着热处理时间的延长,合金电极的最大放电容量与循环稳定性能均得到明显改善,而高倍率放电性能却逐渐恶化。
The effect of heat treatment time on the microstructure and electrochemical performance of La0.7Mg0.3Ni2.45Co0.75Mn0.1Al0.2 alloy electrode was investigated. XRD results show that all the alloys consist of two phases of (La, Mg) Ni3 and LaNi5, and the heat treatment does not cause the phase transition of the hydrogen storage alloy. The results of electrochemical studies show that the maximum discharge capacity and cycle stability of the alloy electrode are obviously improved with the prolongation of the heat treatment time, but the discharge performance of the high-rate discharge gradually deteriorates.