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测定了LaNi5基储氢合金的相成分,晶体结构和电化学性能。电化学测试是以合金粉制成负极,以烧结Ni(OH)2为正极,以6 mol.L-1KOH溶液为电解液,制成开口式MH-Ni二次电池在室温下测定的。测定结果表明,在LaNi5-xSix系列合金中,LaNi4.7Si0.3具有较高的放电容量,较好的放电平台和较快的活化速度。Cr部分替代LaNi4.7Si0.3合金中的Si形成的LaNi4.7Si0.3-xCrx合金均为CaCu5结构,未改变原合金的晶体结构。其中LaNi4.7Si0.22Cr0.08合金具有良好的综合性能。小电流放电时性能比大电流放电时好。
The phase composition, crystal structure and electrochemical performance of LaNi5-based hydrogen storage alloy were measured. Electrochemical test is made of alloy powder anode, sintered Ni (OH) 2 as cathode, with 6 mol.L-1KOH solution as electrolyte, made of open MH-Ni secondary batteries measured at room temperature. The results show that in LaNi5-xSix series alloy, LaNi4.7Si0.3 has higher discharge capacity, better discharge platform and faster activation rate. The LaNi4.7Si0.3-xCrx alloy formed by partial substitution of Cr for Si in LaNi4.7Si0.3 alloy is CaCu5 structure, which does not change the crystal structure of the original alloy. Among them LaNi4.7Si0.22Cr0.08 alloy has a good overall performance. Small current discharge performance than when the high-current discharge.