Self-assembled nickel-cobalt oxide microspheres from rods with enhanced electrochemical performance for sodium ion battery

Mobinul Islam, Min Gi Jeong, Jang Yeon Hwang, In Hwan Oh, Yang Kook Sun, Hun Gi Jung

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Exploring new anode materials with promising electrochemical capacity is essential for rechargeable sodium-ion batteries. The selection and structural design of electrode materials play key role in the development of a viable battery with high specific capacity and cycle retention. Herein, self-assembled NiCo2O4 microspheres comprised of numerous sub-micron sized rods are prepared for the first time by a simple co-precipitation method. The synthesized microspheres have homogeneous morphology and a multimodal porosity. The resulting sodium ion storage properties demonstrate that the NiCo2O4 microsphere anode offers excellent electrochemical performance, with a high reversible capacity of 620 mAh g−1 at a current density of 0.05 A g−1. It also shows an exceptionally high rate capability up to 10 A g−1 equivalent to 11 C-rate, which can be attributed to the existence of capacitive behavior. Notably, the rate performance and cycling stability are significantly higher than most previously reported results of NiCo2O4 nanostructures for sodium-ion batteries (SIBs).

Original languageEnglish
Pages (from-to)220-227
Number of pages8
JournalElectrochimica Acta
Volume258
DOIs
StatePublished - 20 Dec 2017

Keywords

  • Anode materials
  • Conversion materials
  • Microspheres
  • NiCoO
  • Sodium ion battery

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