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

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

doi:10.1002/pssr.201308101

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

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

P2-type Na_xM 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 M^4-x and O^2-. 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 Na_0.52MnO₂ is significantly smaller than 190 K for Na_0.59CoO₂. We interpret the suppressed ${\rm \Delta }\varepsilon $ in Na_0.52MnO₂ in terms of the screening effect of the Na⁺ charge.

Original language	English
Pages (from-to)	1097-1101
Number of pages	5
Journal	Physica Status Solidi - Rapid Research Letters
Volume	7
Issue number	12
DOIs	https://doi.org/10.1002/pssr.201308101
Publication status	Published - 2013 Dec
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Condensed Matter Physics
Materials Science(all)

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@article{5dc95359725d496d97a8dea9c21075ab,

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

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.",

keywords = "Crystal structure, Na CoO, Na MnO, Sodium ion secondary batteries, X-ray diffraction",

author = "D. Tanabe and T. Shimono and Wataru Kobayashi and Y. Moritomo",

year = "2013",

month = dec,

doi = "10.1002/pssr.201308101",

language = "English",

volume = "7",

pages = "1097--1101",

journal = "Physica Status Solidi - Rapid Research Letters",

issn = "1862-6254",

publisher = "Wiley-VCH Verlag",

number = "12",

}

TY - JOUR

T1 - Na-site energy of P2-type NaxM O2 (M = Mn and Co)

AU - Tanabe, D.

AU - Shimono, T.

AU - Kobayashi, Wataru

AU - Moritomo, Y.

PY - 2013/12

Y1 - 2013/12

N2 - 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.

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.

KW - Crystal structure

KW - Na CoO

KW - Na MnO

KW - Sodium ion secondary batteries

KW - X-ray diffraction

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U2 - 10.1002/pssr.201308101

DO - 10.1002/pssr.201308101

M3 - Article

AN - SCOPUS:84890205893

SN - 1862-6254

VL - 7

SP - 1097

EP - 1101

JO - Physica Status Solidi - Rapid Research Letters

JF - Physica Status Solidi - Rapid Research Letters

IS - 12

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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