Correlation between phase structure and electrochemical properties of Ce2Ni7-type La-RE-Mg-Ni (RE = Nd, Sm, Y) alloys: A comparative study

Zhi Jie Gao, Bo Zhang, Yong Chun Luo, Hai Wen Li

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)183-190
Number of pages8
JournalJournal of the Taiwan Institute of Chemical Engineers
Volume89
DOIs
Publication statusPublished - Aug 2018

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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