Probing the Sodium Insertion/Extraction Mechanism in a Layered NaVO3 Anode Material

Ghulam Ali, Mobinul Islam, Hun Gi Jung, Kyung Wan Nam, Kyung Yoon Chung

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

For the realization of sodium-ion batteries (SIBs), high-performance anode materials are urgently required with the advantages of being low-cost and environment-friendly. In this work, layered-type NaVO3 is prepared by the simple solid-state route with a rod-like morphology and used as an anode material for SIBs. The NaVO3 electrode exhibits a high specific capacity of 196 mA h g-1 during the first cycle and retains a capacity of 125 mA h g-1 at the 80th cycle with a high Coulombic efficiency of >99%, demonstrating high reversibility. The sodium diffusion coefficient in NaVO3 is measured using electrochemical impedance spectroscopy (1.368 × 10-15 cm2 s-1), the galvanostatic intermittent titration technique (1.15715 × 10-13 cm2 s-1), and cyclic voltammetry (2.7935 × 10-16 cm2 s-1). Furthermore, the reaction mechanism during the sodiation/desodiation process is investigated using in situ X-ray diffraction and X-ray absorption near the edge structure analysis, which suggests the formation of an amorphous-like phase and reversible redox reaction of V4+ ↔ V5+, respectively.

Original languageEnglish
Pages (from-to)18717-18725
Number of pages9
JournalACS Applied Materials and Interfaces
Volume10
Issue number22
DOIs
StatePublished - 6 Jun 2018

Keywords

  • amorphous-like
  • kinetic study
  • NaVO
  • sodium diffusion coefficient
  • solid-state method

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