超结构R-Y-Ni系A5B19型(R=Y，La，Pr，Nd，Sm) 储氢合金微观结构和电化学性能的影响

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摘要用真空电弧熔炼和均匀化退火处理制备了A5B19型R0.45Y0.55Ni3.5Mn0.2Al0.1(R=Y，La，Pr，Nd，Sm)储氢合金，采用XRD、SEM-EDS与电池测定系统分析了镧系稀土元素R对R-Y-Ni系A5B19型储氢合金微观结构和电化学性能的影响规律。结果表明，退火合金包含Ce5Co19型相、Ce2Ni7型相和CaCu5型相多相结构，合金主相Ce5Co19型相丰度随R原子半径变大而减少，各相晶格常数a、c及晶胞体积V均随稀土R原子半径的减小而依次减少。电化学结果表明，当R=La时，合金电极拥有最大的放电容量为390 mAh/g；R=Nd时合金电极具有最佳的循环寿命(S100=90.0%)，当R=Pr时，合金的HRD900性能最佳达到86.7%。各种合金电极的HRD900和D0呈现良好的对应关系，因此合金电极动力学性能主要由氢在合金中的扩散控制。

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	杨洋
	姜婉婷
	邓安强
	罗永春

关键词 ：稀土元素, La-Y-Ni系, A5B19 型储氢合金, 微观结构, 电化学性能

Abstract：The R-Y-Ni based A5B19-type R0.45Y0.55Ni3.5Mn0.2Al0.1(R=Y，La，Pr，Nd，Sm) alloys were prepared by vacuum arc melting and followed by annealing treatment. The effects of rare earth element R on the microstructure, hydrogen storage and electrochemical properties of the alloys were investigated systematically. XRD and SEM-EDS analysis showed that the annealed alloys mainly composed of Ce5Co7-type phases, Ce2Ni7-type and CaCu5-type phases. XRD whole pattern fitting showed that the abundance of main phase Ce5Co19-type phase becomes smaller as the radius of R atom becomes larger, the lattice constants a, c and cell volume V of the Ce5Co19-type main phases decreased in sequence with the decreasing radius of R atoms. The electrochemical results showed that the alloy electrode has the highest discharge capacity when the substitute element is La, the R=Nd alloys exhibited the best cyclic stability (S100=90.0%), the R=Pr alloys exhibited the best high rate discharge performance (HRD900=86.7%). The HRD900 and D0 of all alloy electrodes show a good corresponding relationship. So High rate discharge ability of the electrode was controlled by the diffusion of hydrogen atoms in the alloy.

Key words： Rare earth elements La-Y-Ni alloys A5B19-type hydrogen storage alloys Microstructure Electrochemical properties

收稿日期: 2020-06-15 出版日期: 2021-08-17

基金资助:La-Y-Ni系无镁超点阵结构AB3.0-3.8型多元合金储氢行为及电化学性能研究

通讯作者: 罗永春 E-mail: luoyc@lut.cn

引用本文:

杨洋姜婉婷邓安强罗永春. 超结构R-Y-Ni系A5B19型(R=Y，La，Pr，Nd，Sm) 储氢合金微观结构和电化学性能的影响[J]. , 2021, 28(4): 0-0.

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http://edit.chinamet.cn/Jweb_jsgncl/CN/ 或 http://edit.chinamet.cn/Jweb_jsgncl/CN/Y2021/V28/I4/0

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