摘要
采用机械合金化法(MA)制备了非晶态LaMg11Zr+200%(质量分数,下同)N i+x%La(x=0,5,10)系列储氢合金,并详细研究了La添加对该系列合金的相结构及电化学性能的影响。结构分析表明,球磨20h该系列合金都呈非晶态,La添加后合金颗粒得到明显细化;电化学研究表明,La添加后,合金电极充电阻力减小,放电容量随La含量的增加而增大,适量La的添加一定程度上改善了合金电极的循环稳定性和动力学性能,LaMg11Zr+200%N i+5%La合金电极达到最大放电容量597.2mAh.g-1,循环30次后的容量保持率仍为53.5%。
The LaMgnZr ＋ 200% Ni ＋ x% La （x = 0,5,10） amorphous alloys were prepared by mechanical alloying （ MA）, and the effect of La content on the structure and electrochemical properties of MA amorphous alloys had been investi- gated. The structure analysis of alloys showed that alloys were amorphous after 20h ball -milling, and the La addition signifi- cantly refined the alloy particles. The electrochemical test showed that the charging resistance of the alloy electrodes decreased with La addition; the maximum discharge capacity of the alloy electrodes increased with the increase of La content, La addition can improve the cyclic stability and dynamic performance of alloy electrodes to some extent. LaMgn Zr ＋ 200% Ni ＋ 5% La al- loy electrode achieved the maximum discharge capacity of 597.2mAh · g^-1, and the cycling retention rate of the composites was 53.5% after 30 cycles.
出处
《稀土》
EI
CAS
CSCD
北大核心
2011年第3期24-27,共4页
Chinese Rare Earths
基金
中国博士后基金(20080430221)
江苏省自然科学基金(BK2009577)
关键词
储氢合金
La添加
相结构
电化学性能
hydrogen storage ahoy
La addition
phase structure
electrochemical characteristics
