Phase Structure, Electrochemical Properties and Cyclic Characteristic of a Rhombohedral-Type Single-Phase Nd2MgNi9 Hydrogen Storage Alloy
Phase Structure, Electrochemical Properties and Cyclic Characteristic of a Rhombohedral-Type Single-Phase Nd2MgNi9 Hydrogen Storage Alloy
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菱形单相Nd2MgNi9储氢合金的相结构、电化学性能和循环特性
DOI：
10.1149/2.0111608jes
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发表时间：
2016
影响因子：
3.9
通讯作者：
Han Shumin
中科院分区：
文献类型：
--
作者：
Du Wenkai;Zhang Lu;Li Yuan;Zhao Yumeng;Yang Shuqin;Liu Baozhong;Han Shumin
采用感应熔炼-分区退火的方法制备了单相PuNi 3型Nd 2 MgNi 9合金，研究了该合金的结构和电化学性能。低角X射线衍射和Rietveld精修分析证实了Nd 2 MgNi 9合金的晶体结构为PuNi 3型超堆垛结构，空间群为R-3 m。结果表明，Nd 2 MgNi 9合金电极具有良好的电化学性能.合金电极的放电容量为370.6 mAh g− 1，在1440 mA g− 1放电电流密度下，其高倍率放电性能达到49.6%。特别是在第100次充放电循环时，合金的循环稳定性提高到92.1%，在第300次充放电循环时，合金的循环稳定性保持在79%，明显优于PuNi 3型La 2 MgNi 9合金。根据R-3 m晶体结构计算结果，发现单相Nd 2 MgNi 9合金在氢化/脱氢后具有较小的体积变形率ΔV/V（+ 1.19%）和晶格应变（0.3180（3）%），导致合金颗粒的粉化程度较弱，活性物质的氧化/腐蚀较小。
A single-phase PuNi 3-type Nd 2 MgNi 9 alloy was firstly prepared through induction melting followed by zoning annealing method, and the structural and electrochemical properties of the alloy were studied. Low-angle X-ray diffraction and Rietveld refinement analyses verify that the crystal structure of the Nd 2 MgNi 9 alloy is the PuNi 3-type super-stacking structure with a space group R-3m. It is found that the Nd 2 MgNi 9 alloy electrode exhibits excellent electrochemical properties. The discharge capacity of the alloy electrode is 370.6 mAh g− 1 and its high rate dischargeability reaches up to 49.6% at a 1440 mA g− 1 discharge current density. Especially, the cyclic stability is heightened to 92.1% at the 100 th charge/discharge cycle and retains 79% at the 300 th charge/discharge cycle, which are significantly better than those of the PuNi 3-type La 2 MgNi 9 alloy. On the basis of the R-3m crystal structure calculation results, we found that the single-phase Nd 2 MgNi 9 alloy has the smaller volume deformation rate ΔV/V (+ 1.19%) and lower lattice strain (0.3180 (3)%) after hydrogenation/dehydrogenation, resulting in the weaker pulverization degree of the alloy particle and minor oxidization/corrosion of active material.
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影响因子：
3.9
作者：
G. Zheng;B. Popov;R. White
通讯作者：
G. Zheng;B. Popov;R. White
Nd0.88Mg0.12Ni3.10 xAl0.20(x=0.00、0.10、0.20、0.30)储氢合金自放电性能研究
影响因子：
6.2
作者：
G.Y. Shang;Y. Li;S.M. Han;Y. Liu;X.L. Zhu;J.S. Hao;D.Y. Xie
通讯作者：
D.Y. Xie
Mg替代对Nd1-xMgxNi3(x=0.10-0.50)合金相结构和电化学性能的影响
影响因子：
6.2
作者：
Li, Yuan;Yang, Shuqin;Han, Shumin;Fan, Yanping
通讯作者：
Fan, Yanping
影响因子：
7.2
作者：
K. Iwase;N. Terashita;K. Mori;S. Tsunokake;T. Ishigaki
通讯作者：
K. Iwase;N. Terashita;K. Mori;S. Tsunokake;T. Ishigaki
影响因子：
6.6
作者：
Faliang Zhang;Yong-chun Luo;A. Deng;Zhaohui Tang;L. Kang;Jianhong Chen
通讯作者：
Faliang Zhang;Yong-chun Luo;A. Deng;Zhaohui Tang;L. Kang;Jianhong Chen