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

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

*この研究の対応する著者

4 被引用数 (Scopus)

## 抄録

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.

本文言語 English 1097-1101 5 Physica Status Solidi - Rapid Research Letters 7 12 https://doi.org/10.1002/pssr.201308101 Published - 2013 12月 はい

• 凝縮系物理学
• 材料科学（全般）

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