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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 3.8V 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. © The Electrochemical Society of Japan, All rights reserved.

electrochemistry

Investigation on Crystal and Electronic Structures of 0.5Li2MnO3-0.5LiMnxNixCo(1^|^minus;2x)O2 (x = 1/3, 5/12) Samples Heat-Treated under Vacuum Reducing Conditions