高分子錯体重合法によるLiMnO_2前駆体の合成及び電気化学的特性

概要

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LiMnO_2 precursors were synthesized by polymerized complex method, using malic acid and ethylene glycol Crystal phase of LiMnO_2 was affected by the reaction temperature and time of starting solution. Differential thermal analysis and thermogravimetry revealed that a large amount of organic species and water was involved in the LiMnO_2 precursor. The chemical composition of LiMnO_2 precursors was found to be in good agreement with that of the starting solution composition. Single phase LiMnO_2 was obtained by heating at 900-940℃, for 12 h. The first discharge capacity of LiMnO_2 exhibited about 190 mAh/g at 0.1 mA/cm^2, in which 120 mAh/g were associated with the 4 V region and 70 mAh/g with the 3 V region. The discharge capacity decreased to 140 mA/g at 0.5 mA/cm^2. The discharge capacity gradually decreased with increasing the number of cycles up to several cycles, but showed stable cycling performance after 10 cycles.
社団法人日本セラミックス協会の論文
1999-05-01