Structural Response of P2-Type Na

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概要

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• P2-type Na<inf>x</inf>MnO<inf>2</inf>(P6_{3}/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<inf>x</inf>MnO<inf>2</inf>(0.43 \leq x \leq 0.71) against Na⁺concentration (x). We found that the thicknesses (d_{\text{NaO\scale70%_{2}}}) of the NaO<inf>2</inf>layer is nearly independent of x, in a sharp contrast to the rapid decrease observed in isostructural Na<inf>x</inf>CoO<inf>2</inf>. In addition, the site energy differences [\Delta\epsilon = \epsilon_{1} - \epsilon_{2}; \epsilon_{1} (\epsilon_{2}) is the site energy at Na1 (Na2)] in Na<inf>x</inf>MnO<inf>2</inf>are much smaller than those in Na<inf>x</inf>CoO<inf>2</inf>. These observations are interpreted in terms of the screening effect of the Na⁺charge in Na<inf>x</inf>MnO<inf>2</inf>.

• 2013-08-15

著者

• Moritomo Yutaka

  Graduate School Of Pure And Applied Science University Of Tsukuba

• Kobayashi Wataru

  Graduate School Of Pure And Applied Sciences University Of Tsukuba

• Shimono Takahiro

  Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan

• Tanabe Daiki

  Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan

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