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用熔炼-快淬工艺制备La15Fe77-xNixMn5B3(x=55,60,65,70,75)储氢电极合金。采用XRD、SEM、EDS及电化学方法研究合金的组织结构、放氢平台特性和电化学性能。研究结果表明,La15Fe77-xNixMn5B3(x=55,60,65,70,75)合金均为多相结构,主相是LaNi5相,另外还有(Fe,Ni)相和La3Ni13B2相。随Ni含量增加,合金电极的最大放电容量逐渐增加,活化次数明显减少,放氢平台特性变好,高倍率放电性能明显改善。
La15Fe77-xNixMn5B3 (x = 55,60,65,70,75) hydrogen storage electrode alloys were prepared by melting-quenching process. XRD, SEM, EDS and electrochemical methods were used to study the microstructure, hydrogen-discharging platform characteristics and electrochemical properties of the alloy. The results show that the La15Fe77-xNixMn5B3 (x = 55,60,65,70,75) alloys are all multi-phase structures with the main phase being LaNi5 phase, with (Fe, Ni) phase and La3Ni13B2 phase. With the increase of Ni content, the maximum discharge capacity of the alloy electrode gradually increases, the number of activation is significantly reduced, the characteristics of the hydrogen desorption platform become better, and the discharge performance at high rate is obviously improved.