V2O5-NiO composite nanowires: A novel and highly efficient carbon-free electrode for non-aqueous Li-air batteries operated in ambient air

R. H. Zhang, T. S. Zhao, H. R. Jiang, M. C. Wu, L. Zeng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

23 Citations (Scopus)

Abstract

Due to the ultra-high theoretical energy density, the non-aqueous Li-air battery has attracted a lot of attention over the past decade. However, the decomposition of electrode during discharge and charge processes has limited the further development of this technology. Here, we fabricate a novel carbon- and binder-free electrode, V2O5-NiO composite nanowires, for non-aqueous Li-air batteries. With this novel electrode, the battery displays an over-potential of as low as 0.56 V and is operated stably for 250 cycles (1000 h) with an energy efficiency of as high as 70% at the current of 250 mA g−1 in pure oxygen. When the current density further increases to 500 and 750 mA g−1, the electrode enables the battery to operate stably for 220 and 200 cycles, indicating the excellent cycling stability and rate capability of the V2O5-NiO composite nanowire in pure oxygen. Moreover, in ambient air, the battery with this electrode can be steadily cycled for 200 times (800 h) at the current density of 250 mA g−1 with an energy efficiency of as high as ∼68%. Therefore, the V2O5-NiO composite nanowire offers great promise to replace the carbon electrode and further realize the operation of non-aqueous Li-air battery in ambient air.

Original languageEnglish
Pages (from-to)76-85
Number of pages10
JournalJournal of Power Sources
Volume409
DOIs
Publication statusPublished - 1 Jan 2019
Externally publishedYes

Keywords

  • Ambient air
  • Composite nanowire
  • Nickel oxide
  • Non-aqueous Li-Air batteries
  • Vanadium pentoxide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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