Na-site energy of P2-type NaxM O2 (M = Mn and Co)

D. Tanabe, T. Shimono, Wataru Kobayashi, Y. Moritomo

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

P2-type NaxM O2 (M = Mn and Co) is a promising cathode material for low-cost sodium ion secondary batteries. In this structure, there are two different crystallographic Nai (i = 1 and 2) sites with different Coulomb potential $ (\varphi _i)$ provided by M4-x and O2-. Here, we experimentally determine a difference ${(\rm \Delta }\varepsilon \equiv \varepsilon _1 - \varepsilon _2)$ of Na-site energies ${(}\varepsilon _i \equiv e\varphi {\kern 1pt} _i)$ based on the temperature dependence of the site occupancies. We find that ${\rm \Delta }\varepsilon \;{=}\;56\;{K}$ for Na0.52MnO2 is significantly smaller than 190 K for Na0.59CoO2. We interpret the suppressed ${\rm \Delta }\varepsilon $ in Na0.52MnO2 in terms of the screening effect of the Na+ charge.

Original languageEnglish
Pages (from-to)1097-1101
Number of pages5
JournalPhysica Status Solidi - Rapid Research Letters
Volume7
Issue number12
DOIs
Publication statusPublished - 2013 Dec
Externally publishedYes

Fingerprint

Secondary batteries
Screening
Cathodes
Sodium
Ions
Costs
storage batteries
Coulomb potential
Temperature
energy
screening
cathodes
sodium
temperature dependence
ions

Keywords

  • Crystal structure
  • Na CoO
  • Na MnO
  • Sodium ion secondary batteries
  • X-ray diffraction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

Cite this

Na-site energy of P2-type NaxM O2 (M = Mn and Co). / Tanabe, D.; Shimono, T.; Kobayashi, Wataru; Moritomo, Y.

In: Physica Status Solidi - Rapid Research Letters, Vol. 7, No. 12, 12.2013, p. 1097-1101.

Research output: Contribution to journalArticle

Tanabe, D, Shimono, T, Kobayashi, W & Moritomo, Y 2013, 'Na-site energy of P2-type NaxM O2 (M = Mn and Co)', Physica Status Solidi - Rapid Research Letters, vol. 7, no. 12, pp. 1097-1101. https://doi.org/10.1002/pssr.201308101
Tanabe, D. ; Shimono, T. ; Kobayashi, Wataru ; Moritomo, Y. / Na-site energy of P2-type NaxM O2 (M = Mn and Co). In: Physica Status Solidi - Rapid Research Letters. 2013 ; Vol. 7, No. 12. pp. 1097-1101.
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AB - P2-type NaxM O2 (M = Mn and Co) is a promising cathode material for low-cost sodium ion secondary batteries. In this structure, there are two different crystallographic Nai (i = 1 and 2) sites with different Coulomb potential $ (\varphi _i)$ provided by M4-x and O2-. Here, we experimentally determine a difference ${(\rm \Delta }\varepsilon \equiv \varepsilon _1 - \varepsilon _2)$ of Na-site energies ${(}\varepsilon _i \equiv e\varphi {\kern 1pt} _i)$ based on the temperature dependence of the site occupancies. We find that ${\rm \Delta }\varepsilon \;{=}\;56\;{K}$ for Na0.52MnO2 is significantly smaller than 190 K for Na0.59CoO2. We interpret the suppressed ${\rm \Delta }\varepsilon $ in Na0.52MnO2 in terms of the screening effect of the Na+ charge.

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