| Electrochemical performance of SrF2-coated LiMn2O4 cathode material for Li-ion batteries |
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| 作者姓名： | 李建刚 何向明 赵如松 |
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| 作者单位： | [1]School of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China [2]Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing100084, China |
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| 摘 要： | SrF2-coated LiMn2O4 powders with excellent electrochemical performance were synthesized. The electrochemical performance of SrF2-coated LiMn2O4 electrodes was studied as function of the level of SrF2 coating. With increasing the amount of the coated-SrF2 to 2.0% （molar fraction）, the discharge capacity of LiMn2O4 decreases slightly, but the cycleability of LiMn2O4 at elevated temperature is improved obviously. In view of discharge capacity and cycleability, the 2.0% （molar fraction） coated sample shows optimum cathodic behaviors. When being cycled at 55 ℃, as-repared LiMn2O4 remains only 79% of its initial capacity after 20 cycles, whereas the 2.0% （molar fraction） coated sample shows initial discharge capacity of 108 mA-h/g, and 97% initial capacity retention.
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| 关 键 词： | 锂离子电池 表面涂层 LiMn2O4 电气化学性质 |
| 收稿时间： | 15 July 2007 |
| 修稿时间： | 2007-07-15 |
Electrochemical performance of SrF2-coated LiMn2O4 cathode material for Li-ion batteries |
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| Jian-gang LI, Xiang-ming HE,Ru-song ZHAO.Electrochemical performance of SrF2-coated LiMn2O4 cathode material for Li-ion batteries[J].Transactions of Nonferrous Metals Society of China,2007,17(6):1324-1327. |
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| Authors: | Jian-gang LI Xiang-ming HE Ru-song ZHAO |
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| Affiliation: | 1. School of Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China; 2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing100084, China |
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| Abstract: | SrF2-coated LiMn2O4 powders with excellent electrochemical performance were synthesized. The electrochemical performance of SrF2-coated LiMn2O4 electrodes was studied as function of the level of SrF2 coating. With increasing the amount of the coated-SrF2 to 2.0% (molar fraction), the discharge capacity of LiMn2O4 decreases slightly, but the cycleability of LiMn2O4 at elevated temperature is improved obviously. In view of discharge capacity and cycleability, the 2.0% (molar fraction) coated sample shows optimum cathodic behaviors. When being cycled at 55 °C, as-prepared LiMn2O4 remains only 79% of its initial capacity after 20 cycles, whereas the 2.0% (molar fraction) coated sample shows initial discharge capacity of 108 mA-h/g, and 97% initial capacity retention. |
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| Keywords: | lithium ion batteries LiMn2O4 surface coating SrF2 |
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