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研制了5个LaNi5型贮氢合金试样,分别对5种合金试样电极的电化学放电容量、高倍率充放电和宽温度范围内充放电性能、循环稳定性及其相结构进行了测试和分析。结果表明:Sn及Si的搀杂增加了合金的非化学计量比,稳定了合金的循环稳定性并改善了合金的高倍率充放性能;合金样(Ml0.90Nd0.10)Ni3.60Co0.50Mn0.40Al0.18Si0.42的容量较高,5C充电效率大于95%,5C放电效率大于90%,400次充放循环后容量保持率大于70%;所设计合金晶型均为CaCu5相,充放电循环后合金主相仍是CaCu5相,同时发生氧化和粉化现象。
Five LaNi5-type hydrogen storage alloy samples were developed. The electrochemical discharge capacity, high-rate charge-discharge and charge-discharge performance, cycle stability and phase structure of five kinds of alloy samples were tested and analysis. The results show that the doping of Sn and Si increases the non-stoichiometric ratio of the alloy, stabilizes the cycle stability of the alloy and improves the high rate charge-discharge performance of the alloy; the alloy sample (Ml0.90Nd0.10) Ni3.60Co0.50Mn0. 40Al0.18Si0.42 has a higher capacity, the charging efficiency of 5C is more than 95%, the discharging efficiency of 5C is more than 90% and the capacity retention rate is more than 70% after 400 cycles of charging and discharging. The designed alloy crystal forms are all CaCu5 phases, After the alloy is still the main phase CaCu5 phase, while oxidation and chalking phenomenon.