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La_(1.3)CaMg_(0.7)Ni_9储氢合金 被引量:6

La_(1.3)CaMg_(0.7)Ni_9 hydrogen storage alloy
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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%。 The structure of La_(1.3)CaMg_(0.7)Ni_9 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 LaNi_3 with PuNi_3 structure as matrix phase and LaNi_5 and LaNi_(2.28) as secondary phases. At 1.6MPa H_2 pressure and 300K the hydrogen storage capacity of alloy reaches to 1.68% (mass fraction), which is 20% higher than that of pure LaNi_5. 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 AB_5 type hydrogen storage alloys. After 100 charging/discharging cycles, 80% of the initial capacity can remain.
出处 《中国有色金属学报》 EI CAS CSCD 北大核心 2004年第1期51-54,共4页 The Chinese Journal of Nonferrous Metals
基金 国家教育部骨干教师基金资助项目
关键词 储氢合金 La1.3CaMg0.7Ni9 XRD 晶体结构 P-C-T曲线 放电容量 循环稳定性 hydrogen storage alloy P-C-T curve discharge capacity cycle stability
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