Reaction Synthesis and Discharge Performance of Binary Vanadium Borides

Yu Pan, Xin Lu, Zhi Guo Wei, Guo Qing Wang, Xuan Hui Qu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Vanadium boride compound powders with different compositions were prepared by reactive synthesis at 1500℃ from elemental powders. Then, with the obtained powders as active materials, Ni powder as conductive agent and NH4HCO3 as space-holder, the porous anodes of V-xB/Ni (x=2/3~2) were fabricated by powder metallurgy (PM), respectively. The effects of V-xB compounds with different phases on the discharge performance of the assembled air batteries were studied. The results show that the single-phased VB2 powder can be obtained from the raw powder with the atomic ratio of V:B=1:2, and so does the VB powder. As for atomic ratio of V:B=3:2, the synthesized powder consists of V3B2 and a small amount of VB, while the ratio of V:B=2:3 yields the phase composition of V2B3, V3B4 and minor VB2. The prepared V-xB/Ni anodes with porosity of 60.25%-61.75% exhibit good discharge performance, and their capacity can reach the range of 6129-7901 mAh while specific capacity is 2724-3511 mAh/g. With the increase of B content, the discharge performance of V-xB/Ni anodes shows a significant improvement. In comparison, the porous V-2B/Ni anode possesses the superior discharge properties with discharge capacity of 3512 mAh/g, coulombic efficiency of 86.5% and specific energy of 2504 Wh/kg.

Original languageEnglish
Pages (from-to)407-412
Number of pages6
JournalWuji Cailiao Xuebao/Journal of Inorganic Materials
Volume32
Issue number4
DOIs
Publication statusPublished - 2017 Apr 1
Externally publishedYes

Keywords

  • Air battery
  • Powder metallurgy
  • Reactive synthesis
  • V-xB compounds

ASJC Scopus subject areas

  • Materials Science(all)
  • Inorganic Chemistry

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