(西安交通大学 金属材料强度国家重点实验室， 西安 710049)
摘 要: 采用XRD分析了La1.3CaMg0.7Ni9储氢合金的晶体结构， 并研究了合金的气相储氢特性以及电化学性能。 结果表明， 合金由具有PuNi3结构的LaNi3主相和LaNi5、 LaNi2.28第二相构成； 在1.6MPa氢压和300K下， 合金的储氢量达到1.68%（质量分数）， 比纯LaNi5的储氢量提高了20%； 合金的活化性能良好， 经3个充放电循环即可完全活化， 其放电容量达到395mA·h/g， 比AB5型储氢合金的容量提高了23％， 经100次循环后容量保持率为80%。
关键字: 储氢合金； P-C-T曲线； 放电容量； 循环稳定性
（State Key Laboratory for Mechanical Behavior of Materials,
Xi′an Jiaotong University, Xi′an 710049, China）
Abstract: The structure of La1.3CaMg0.7Ni9 hydrogen storage alloy was analyzed by XRD. The gas hydrogen storage characteristics and electrochemical properties of alloy were investigated. The results show that the prepared alloy is composed of LaNi3 with PuNi3 structure as matrix phase and LaNi5 and LaNi2.28 as secondary phases. At 1.6MPa H2 pressure and 300K the hydrogen storage capacity of alloy reaches to 1.68% (mass fraction), which is 20% higher than that of pure LaNi5. The activity of alloy is so good that the alloy is activated fully after 3 charging/discharging cycles. The discharge capacity of alloy reaches to 395mA·h/g, which is 23% higher than that of AB5 type hydrogen storage alloys. After 100 charging/discharging cycles, 80% of the initial capacity can remain.
Key words: hydrogen storage alloy； P-C-T curve； discharge capacity； cycle stability
