Electronic State of P2-Type Na
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概要
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P2-type Na<inf>x</inf>O<inf>2</inf>(M = Mn and Co) with a layered structure is a promising cathode material for low-cost sodium ion secondary batteries (SIBs). Here, we performed an in situ X-ray absorption spectroscopy (XAS) of Na<inf>x</inf>MnO<inf>2</inf>and Na<inf>x</inf>CoO<inf>2</inf>near the Mn and Co K-edges against Na concentration (x). In both compounds, the red shift of the main peak with x indicates the electron doping on the Mn 3d (Co 3d) orbital. We further analyzed the pre-edge XAS profiles with several configuration models. In Na<inf>x</inf>MnO<inf>2</inf>, the spectral weights of the doublet components suggest the high-spin (HS) state of Mn. In Na<inf>x</inf>CoO<inf>2</inf>, the single peak feature suggests that the ground-state configurations of Co<sup>4+</sup>and Co<sup>3+</sup>have significant weights of d^{6}L and d^{7}L, where L denotes an oxygen 2p hole.
- 2013-12-15
著者
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Moritomo Yutaka
Graduate School Of Pure And Applied Science University Of Tsukuba
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Kobayashi Wataru
Graduate School Of Pure And Applied Sciences University Of Tsukuba
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Shimono Takahiro
Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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Tanabe Daiki
Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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Nitani Hiroaki
Institute of Materials Structure Science (IMS), High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
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