An alternative for the anode materials of nickel metal hydride batteries: an AB3-type La0.6Gd0.2Mg0.2Ni2.6Co0.3Al0.1hydrogen storage alloy

Zhijie Gao, Qingwu Meng, Ying Zhang, Faliang Zhang, Yongchun Luo, Hai Wen Li

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

In order to satisfy the demand for the cyclic stability of commercial Ni-MH anodes, a PuNi3-type La0.6Gd0.2Mg0.2Ni2.6Co0.3Al0.1alloy with excellent overall electrochemical properties was prepared by annealing the as-cast alloy sample at different temperatures for a week. The alloy had the highest PuNi3-type content of 86.9 wt% (1073 K), which offered a capacity retention of 69.6% after 100 cycles. However, 23.7 wt% PuNi3type phase of the alloy constantly converted into the Ce2Ni7type phase within a temperature increase of 50 °C, which improved the capacity retention by 12.1% under the same discharge capacity. We found that the addition of Gd did not change the stacked [LaMgNi4]/[LaNi5] superlattice and it maintained the structural stability of the crystal as well as its anti-corrosion, which is also a key factor to improve cyclic stability. These findings imply that alloys with both PuNi3-type and Ce2Ni7-type multiphase structures can be considered as a new choice for hydrogen storage.

Original languageEnglish
Pages (from-to)6312-6320
Number of pages9
JournalDalton Transactions
Volume49
Issue number19
DOIs
Publication statusPublished - May 21 2020

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

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