Dandelion-like NiCo2O4 hollow microspheres as enhanced cathode catalyst for Li-oxygen batteries in ambient air

Lu Zou, Yuexing Jiang, Junfang Cheng, Yingpeng Gong, Bo Chi, Jian Pu, Li Jian

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The high overpotentials of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in the air cathode are still big challenge to be overcome for the high performance non-aqueous lithium-air batteries (LABs), especially in ambient air. In this paper, dandelion-like NiCo2O4 hollow microspheres are prepared through a simple self-assembled hydrothermal process as cathode catalyst. The assembled LABs show relative high discharge potential in different oxygen partial pressure, and can deliver a reversible capacity of 8019 mAh·g−1 at the current density of 300 mA·g−1 with stable cycle performance for at least 40 times in ambient air. The excellent performance of NiCo2O4 cathode can be attributed to the dandelion hollow structure, together with the abundant oxygen vacancies, which would enhance the ORR and OER process. The study confirms the feasibility of dandelion-like NiCo2O4 hollow spheres as efficient cathode for the LABs in ambient air.

Original languageEnglish
Pages (from-to)120-129
Number of pages10
JournalElectrochimica Acta
Volume216
DOIs
Publication statusPublished - 2016 Oct 20
Externally publishedYes

Keywords

  • ambient air
  • dandelion-like NiCoO
  • hollow spheres
  • Lithium-air batteries

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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