Preparation and performance of LiNi0. 8Co0.2O2 cathode material based on Co-substituted α-Ni(OH)2 precursor |
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作者姓名: | HE YuShi PEI Li LIAO XiaoZhen MA ZiFeng |
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作者单位: | Department of Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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基金项目: | Supported by the National Basic Research Program of China (Grant No. 2007CB209705), the National Natural Science Foundation of China (Grant No. 20773087) and the Natural Science Foundation of Shanghai (Grant No. 07JC14024) |
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摘 要: | Co-substituted α-Ni(OH)2 was synthesized by a novel microwave homogeneous precipitation method in the presence of urea. LiNi0.8Co0.2O2 cathode material was synthesized by calcining Co-substituted α-Ni(OH)2 precursor and LiOH·H2O at 900℃for 10 h in flowing oxygen. XRD, FTIR, FESEM and electrochemical tests were used to study the physical and the electrochemical performances of the materials. The results show that the prepared LiNi0.8Co0.2O2 compound has a good layered hexagonal structure. Moreover, the LiNi0.8Co0.2O2cathode material demonstrates stable cyclability with a high initial specific discharge capacity of 183.9 mAh/g. The good electrochemical performance could be attributed to the uniform distribution of Ni^2+ and Co^2+ ions in the crystal structure and a minimal cation mixing in LiNi0.8Co0.2O2 host structure.
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关 键 词: | 锂离子电池 微波相似性降解方法 钴 氢氧化镍 |
收稿时间: | 25 June 2007 |
修稿时间: | 27 September 2007 |
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