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采用中频感应熔炼-快淬方法制备La15-xSmxFe2Ni76Mn5B2(x=0,2,4,6)型储氢合金。结构分析表明:快淬态La15-xSmxFe2Ni76Mn5B2(x=0,2,4,6)合金为多相结构,主相为La Ni5相,另外还有La3Ni13B2相和(Fe,Ni)相。快淬合金经1173 K保温3小时,而后随炉冷却到室温,随着Sm替代La的量不同,合金的组成相有着不同的变化。电化学测试表明,退火热处理明显提高了合金电极的最大放电容量,改善了合金电极的自放电性能。退火合金电极的高倍率放电能力均低于快淬合金,表明储氢合金电极的电化学动力学性能有所下降。
La15-xSmxFe2Ni76Mn5B2 (x = 0, 2, 4, 6) hydrogen storage alloy was prepared by IF induction melting-quenching method. The structural analysis shows that the rapidly quenched La15-xSmxFe2Ni76Mn5B2 (x = 0, 2, 4, 6) alloy has a multiphase structure with the main phase being La Ni5 phase and La3Ni13B2 phase and (Fe, Ni) phase. The quenched alloy was incubated at 1173 K for 3 hours and then cooled to room temperature in the furnace. The composition of the alloy varied with the amount of La substituted by Sm. Electrochemical tests show that the annealing heat treatment significantly increases the maximum discharge capacity of the alloy electrode and improves the self-discharge performance of the alloy electrode. The high rate discharge capacity of the annealed alloy electrode is lower than that of the quenched alloy, indicating that the electrochemical kinetics of the hydrogen storage alloy electrode has decreased.