期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 152, 期 8, 页码 A1568-A1573出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.1949007
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Nanosized manganese oxide materials with zinc were prepared through a soft solution processing and the cathode properties for lithium batteries were investigated. The materials were prepared through a precipitation process by reduction of permanganate ions in an ethanol solution with controlled pH. X-ray diffraction studies showed that the materials were nanosized crystallites with diameter less than 3.4 nm and that the crystal structures of the compound varied from epsilon-MnO2 phase to birnessite-like phase as pH increased. The Zn concentration in the nanocrystalline compound was controlled by the Zn/Mn molar ratio in the preparation solution. The zinc addition to the manganese oxide material improved the electrochemical properties. The cathode materials synthesized with optimized Zn concentration and pH showed a specific capacity of 100 mAh/g with a good cyclability between 1.5 and 3.9 V vs Li/Li+. (c) 2005 The Electrochemical Society.
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