Structural response of P2-Type NaxMnO2 against Na+ intercalation

Takahiro Shimono, Daiki Tanabe, Wataru Kobayashi, Yutaka Moritomo

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

P2-type NaxMnO2 (P63=mmc, Z = 2) with a layered rock-salt structure is a promising cathode material for low-cost sodium ion secondary batteries (SIBs). Here, we performed an ex situ synchrotron radiation x-ray structural analysis of NaxMnO2 (0:43 ≤ x ≤ 0:71) against Na+ concentration (x). We found that the thicknesses (dNaO2 ) of the NaO2 layer is nearly independent of x, in a sharp contrast to the rapid decrease observed in isostructural NaxCoO2. In addition, the site energy differences [Δε = ε 12; ε 12) is the site energy at Na1 (Na2)] in NaxMnO2 are much smaller than those in NaxCoO2. These observations are interpreted in terms of the screening effect of the Na+ charge in Na xMnO2.

Original languageEnglish
Article number083601
JournalJournal of the Physical Society of Japan
Volume82
Issue number8
DOIs
Publication statusPublished - 2013 Aug
Externally publishedYes

Fingerprint

intercalation
storage batteries
halites
structural analysis
synchrotron radiation
screening
cathodes
sodium
energy
ions
x rays

Keywords

  • Na site occupancy
  • NaCoO
  • NaMnO
  • Na intercalation
  • Structural analysis

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Structural response of P2-Type NaxMnO2 against Na+ intercalation. / Shimono, Takahiro; Tanabe, Daiki; Kobayashi, Wataru; Moritomo, Yutaka.

In: Journal of the Physical Society of Japan, Vol. 82, No. 8, 083601, 08.2013.

Research output: Contribution to journalArticle

Shimono, Takahiro ; Tanabe, Daiki ; Kobayashi, Wataru ; Moritomo, Yutaka. / Structural response of P2-Type NaxMnO2 against Na+ intercalation. In: Journal of the Physical Society of Japan. 2013 ; Vol. 82, No. 8.
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AB - P2-type NaxMnO2 (P63=mmc, Z = 2) with a layered rock-salt structure is a promising cathode material for low-cost sodium ion secondary batteries (SIBs). Here, we performed an ex situ synchrotron radiation x-ray structural analysis of NaxMnO2 (0:43 ≤ x ≤ 0:71) against Na+ concentration (x). We found that the thicknesses (dNaO2 ) of the NaO2 layer is nearly independent of x, in a sharp contrast to the rapid decrease observed in isostructural NaxCoO2. In addition, the site energy differences [Δε = ε 1 -ε 2; ε 1 (ε 2) is the site energy at Na1 (Na2)] in NaxMnO2 are much smaller than those in NaxCoO2. These observations are interpreted in terms of the screening effect of the Na+ charge in Na xMnO2.

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