Improving the phase stability and cycling performance of Ce 2 Ni 7 -type RE-Mg-Ni alloy electrodes by high electronegativity element substitution

Zhijie Gao, Zhongnian Yang, Yongtao Li, Anqiang Deng, Yongchun Luo, Haiwen Li

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In the present work, a high electronegativity element substitution strategy was employed to obtain a better corrosion resistance and cycling performance of Ce 2 Ni 7 -type La 0.83−x Y x Mg 0.17 Ni 3.1 Co 0.3 Al 0.1 (x = 0.0-0.6) alloys. The abundance of the Ce 2 Ni 7 -type phase increased as x increased from 0 to 0.2 but it decreased with a further increase in x up to 0.6. The alloy with x = 0.2 further showed a superior discharge capacity (400.6 mA h g −1 ) and high cycling stability (S 320 = 75%). We found that the Y (electronegativity value χ Y = 1.22 > χ La = 1.10) element could play an essential role in enhancing the anti-corrosion of alloys based on a theoretical framework of the electronegativity of rare earth elements, thus leading to an excellent cycle lifetime of the alloys. The new alloying designs are expected to provide viable La-Mg-Ni-based intermetallic compounds as anode materials for commercial Ni-MH batteries.

Original languageEnglish
Pages (from-to)16453-16460
Number of pages8
JournalDalton Transactions
Volume47
Issue number46
DOIs
Publication statusPublished - Jan 1 2018

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Electronegativity
Phase stability
Substitution reactions
Electrodes
Rare earth elements
Alloying
Intermetallics
Corrosion resistance
Anodes
Corrosion

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

Cite this

Improving the phase stability and cycling performance of Ce 2 Ni 7 -type RE-Mg-Ni alloy electrodes by high electronegativity element substitution . / Gao, Zhijie; Yang, Zhongnian; Li, Yongtao; Deng, Anqiang; Luo, Yongchun; Li, Haiwen.

In: Dalton Transactions, Vol. 47, No. 46, 01.01.2018, p. 16453-16460.

Research output: Contribution to journalArticle

Gao, Zhijie ; Yang, Zhongnian ; Li, Yongtao ; Deng, Anqiang ; Luo, Yongchun ; Li, Haiwen. / Improving the phase stability and cycling performance of Ce 2 Ni 7 -type RE-Mg-Ni alloy electrodes by high electronegativity element substitution In: Dalton Transactions. 2018 ; Vol. 47, No. 46. pp. 16453-16460.
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