Structural response of P2-Type NaxMnO2 against Na+ intercalation

Takahiro Shimono; Daiki Tanabe; Wataru Kobayashi; Yutaka Moritomo

doi:10.7566/JPSJ.82.083601

Structural response of P2-Type NaxMnO2 against Na+ intercalation

Takahiro Shimono, Daiki Tanabe, Wataru Kobayashi, Yutaka Moritomo

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

11 Citations (Scopus)

Abstract

P2-type Na_xMnO₂ (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 Na_xMnO₂ (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 Na_xCoO₂. In addition, the site energy differences [Δε = ε ₁ -ε ₂; ε ₁ (ε ₂) is the site energy at Na1 (Na2)] in Na_xMnO₂ are much smaller than those in Na_xCoO₂. These observations are interpreted in terms of the screening effect of the Na⁺ charge in Na _xMnO₂.

Original language	English
Article number	083601
Journal	Journal of the Physical Society of Japan
Volume	82
Issue number	8
DOIs	https://doi.org/10.7566/JPSJ.82.083601
Publication status	Published - 2013 Aug
Externally published	Yes

Keywords

Na site occupancy
NaCoO
NaMnO
Na intercalation
Structural analysis

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.7566/JPSJ.82.083601

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title = "Structural response of P2-Type NaxMnO2 against Na+ intercalation",

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 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.",

keywords = "Na site occupancy, NaCoO, NaMnO, Na intercalation, Structural analysis",

author = "Takahiro Shimono and Daiki Tanabe and Wataru Kobayashi and Yutaka Moritomo",

year = "2013",

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language = "English",

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T1 - Structural response of P2-Type NaxMnO2 against Na+ intercalation

AU - Shimono, Takahiro

AU - Tanabe, Daiki

AU - Kobayashi, Wataru

AU - Moritomo, Yutaka

PY - 2013/8

Y1 - 2013/8

N2 - 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.

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.

KW - Na site occupancy

KW - NaCoO

KW - NaMnO

KW - Na intercalation

KW - Structural analysis

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JO - Journal of the Physical Society of Japan

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Structural response of P2-Type NaxMnO2 against Na+ intercalation

Abstract

Keywords

ASJC Scopus subject areas

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