【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%。更多还原

【Abstract】 The structure of La_1.3CaMg_0.7Ni₉ 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 LaNi_2.28 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.更多还原