真空還元熱処理による0.5LiMnO-0.5LiMn[x]Ni[x]Co(1-2x)O (x = 1/3, 5/12)の結晶・電子構造

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概要

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• We prepared two 0.5Li2MnO3-0.5LiMnxNixCo(1−2x)O2 (x = 1/3, 5/12) samples using the solution method, followed by heat treatment under vacuum reducing conditions. ICP and average-valence analyses clarified that the amounts of lithium and oxygen were decreased by reductive heat treatments. Results of a cycle performance test showed that the heat-treated samples exhibited a high discharge capacity, although the voltage regions contributing to the improvements depended on the metal composition, i.e., 3.3 and 3.8 V for x = 1/3 and x = 5/12, respectively. In order to discuss the crystal structure, a Rietveld analysis by neutron diffraction was carried out. A localized model in which Mn occupied the 4g site and Li occupied the 2b site in the Li2MnO3-type structure (S.G.; C2/m) resulted in good fitting.

著者

• IDEMOTO Yasushi

  Faculty of Science & Technology, Tokyo University of Science

• KASHIMA Tetsuya

  Faculty of Science & Technology, Tokyo University of Science

• KITAMURA Naoto

  Faculty of Science & Technology, Tokyo University of Science

• IDEMOTO Yasushi

  Faculty of Science & Technology, Tokyo University of Science

• KITAMURA Naoto

  Faculty of Science & Technology, Tokyo University of Science

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• 真空還元熱処理による0.5LiMnO-0.5LiMn[x]Ni[x]Co(1-2x)O (x = 1/3, 5/12)の結晶・電子構造

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