Sodium ion diffusion in layered NaxMnO2 (0.49 ≤ x ≤ 0.75): Comparison with NaxCoO2

Takayuki Shibata, Wataru Kobayashi, Yutaka Moritomo

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The temperature (T) dependence of the sodium ion diffusion coefficient D of a NaxMnO2 thin film is extensively investigated versus x and T using electrochemical impedance spectroscopy. D is found to be 5.0 × 10-11cm2/s at x = 0.54 at 301 K, which is much larger than the value of 0.7 × 10-11cm2/s at x = 0.54 at 303K of a NaxCoO2 thin film. In addition, the activation energy Ea D of D (= 0.26-0.32 eV) is smaller than that of NaxCoO2 (= 0.31-0.44 eV). The improved Na+ diffusion properties of NaxMnO2 are interpreted in terms of the larger interlayer distance (d = 5.54 Å) of NaxMnO 2.

Original languageEnglish
Article number067101
JournalApplied Physics Express
Volume7
Issue number6
DOIs
Publication statusPublished - 2014
Externally publishedYes

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Sodium
sodium
Thin films
Ions
thin films
Electrochemical impedance spectroscopy
interlayers
ions
diffusion coefficient
Activation energy
impedance
activation energy
spectroscopy
Temperature
temperature

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Sodium ion diffusion in layered NaxMnO2 (0.49 ≤ x ≤ 0.75) : Comparison with NaxCoO2. / Shibata, Takayuki; Kobayashi, Wataru; Moritomo, Yutaka.

In: Applied Physics Express, Vol. 7, No. 6, 067101, 2014.

Research output: Contribution to journalArticle

Shibata, Takayuki ; Kobayashi, Wataru ; Moritomo, Yutaka. / Sodium ion diffusion in layered NaxMnO2 (0.49 ≤ x ≤ 0.75) : Comparison with NaxCoO2. In: Applied Physics Express. 2014 ; Vol. 7, No. 6.
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