TY - JOUR
T1 - Correlation between phase structure and electrochemical properties of Ce2Ni7-type La-RE-Mg-Ni (RE = Nd, Sm, Y) alloys
T2 - A comparative study
AU - Gao, Zhi Jie
AU - Zhang, Bo
AU - Luo, Yong Chun
AU - Li, Hai Wen
N1 - Funding Information:
This work was supported by the National Nature Science Foundation of Shandong Province (No. ZR2017QEE014 ) (No. ZR2014EMP012 ), the National Nature Science Foundation of China (No. 51404220 ), the Science and Technology Development Plan of Binzhou (No. 2014ZC0216 ) and the National High Technology Research and Development Program for Advanced Materials of China (No. 2011AA03A408 ).
Publisher Copyright:
© 2018 Taiwan Institute of Chemical Engineers
PY - 2018/8
Y1 - 2018/8
N2 - The correlation between phase structure and electrochemical properties of La0.83Mg0.17Ni3.1Co0.3Al0.1 was investigated firstly by partial substitution of La with Sm. It was found that the La0.83-xSmxMg0.17Ni3.1Co0.3Al0.1 alloy consists mainly of the Ce2Ni7-type phase, the abundance of which reaches the maximum (92.23 wt.%) at x = 0.2 when x is changed from 0 to 0.4. The alloy containing more Ce2Ni7-type phase exhibited the better the cyclic and high rate discharge ability examined by electrochemical measurements, i.e. the best electrochemical performance was confirmed at x = 0.2. Furthermore, the influence of unit cell volumes of the Ce2Ni7-type main phase on electrochemical properties was investigated systematically based on the comparison of substitution effect of Sm, Nd and Y for La at x = 0.2. Compared to those of Nd- and Y-substitutions, the Sm-substituted alloy containing Ce2Ni7-type main-phase showed better overall electrochemical properties, especially Cmax = 393.3 mAh g–1 and S100 = 87.2%. Such superior electrochemical performance may result from appropriate cell volumes and anti-pulverization abilities.
AB - The correlation between phase structure and electrochemical properties of La0.83Mg0.17Ni3.1Co0.3Al0.1 was investigated firstly by partial substitution of La with Sm. It was found that the La0.83-xSmxMg0.17Ni3.1Co0.3Al0.1 alloy consists mainly of the Ce2Ni7-type phase, the abundance of which reaches the maximum (92.23 wt.%) at x = 0.2 when x is changed from 0 to 0.4. The alloy containing more Ce2Ni7-type phase exhibited the better the cyclic and high rate discharge ability examined by electrochemical measurements, i.e. the best electrochemical performance was confirmed at x = 0.2. Furthermore, the influence of unit cell volumes of the Ce2Ni7-type main phase on electrochemical properties was investigated systematically based on the comparison of substitution effect of Sm, Nd and Y for La at x = 0.2. Compared to those of Nd- and Y-substitutions, the Sm-substituted alloy containing Ce2Ni7-type main-phase showed better overall electrochemical properties, especially Cmax = 393.3 mAh g–1 and S100 = 87.2%. Such superior electrochemical performance may result from appropriate cell volumes and anti-pulverization abilities.
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U2 - 10.1016/j.jtice.2018.05.013
DO - 10.1016/j.jtice.2018.05.013
M3 - Article
AN - SCOPUS:85047434601
SN - 1876-1070
VL - 89
SP - 183
EP - 190
JO - Journal of the Taiwan Institute of Chemical Engineers
JF - Journal of the Taiwan Institute of Chemical Engineers
ER -