Electronic State of P2-Type NaxMO2 (M = Mn and Co) as Investigated by In situ X-ray Absorption Spectroscopy

Takahiro Shimono, Daiki Tanabe, Wataru Kobayashi, Hiroaki Nitani, Yutaka Moritomo

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

P2-type NaxMO2 (M = Mn and Co) with a layered structure is a promising cathode material for low-cost sodium ion secondary batteries (SIBs). Here, we performed an in situ X-ray absorption spectroscopy (XAS) of Na xMO2 and NaxMO2 near the Mn and Co K-edges against Na concentration (x). In both compounds, the red shift of the main peak with x indicates the electron doping on the Mn 3d (Co 3d) orbital. We further analyzed the pre-edge XAS profiles with several configuration models. In NaxMnO2, the spectral weights of the doublet components suggest the high-spin (HS) state of Mn. In NaxMO2, the single peak feature suggests that the ground-state configurations of Co4+ and Co 3+3+ have significant weights of d6R and d7R, where R denotes an oxygen 2p hole.

Original languageEnglish
Article number124717
JournalJournal of the Physical Society of Japan
Volume82
Issue number12
DOIs
Publication statusPublished - 2013 Dec
Externally publishedYes

Keywords

  • In situ X-ray absorption spectroscopy
  • NaMO
  • Sodium ion secondary battery

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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