| Li_2CO_3添加剂对石墨电极性能的影响 |
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| 引用本文： | 田雷雷,庄全超,王蓉,崔永莉,方亮,强颖怀.Li_2CO_3添加剂对石墨电极性能的影响[J].高等学校化学学报,2010,31(12):2468-2473. |
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| 作者姓名： | 田雷雷 庄全超 王蓉 崔永莉 方亮 强颖怀 |
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| 作者单位： | 中国矿业大学材料科学与工程学院,锂离子电池实验室,徐州,221116 |
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| 基金项目： | 中国矿业大学科技攀登计划(批准号:ON090237);中国矿业大学青年科技基金(批准号:ON080282);中国矿业大学人才引进经费(批准号:ZX280); 国家与江苏省大学生实践创新训练计划资助 |
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| 摘 要： | 运用电化学阻抗谱(EIS)和循环伏安法(CV)研究了在1mol/LLiPF6-EC(碳酸乙烯酯):DMC(碳酸二甲酯)电解液中添加Li2CO3对石墨电极性能的影响及机制.CV研究结果表明,在1mol/LLiPF6-EC:DMC电解液中添加Li2CO3能够有效抑制石墨电极首次充放电过程中碳酸乙烯酯(EC)的单电子还原过程,即还原分解产生乙烯和碳酸锂的过程,进而改善石墨电极的电化学循环性能.EIS研究结果表明,在添加Li2CO3的1mol/LLiPF6-EC:DMC电解液中,石墨电极表面的固体电解质相界面膜(SEI膜)具有较强的黏弹性,可以更好地适应锂离子嵌入过程中石墨颗粒体积的微小变化,从而使锂离子的嵌入过程更容易进行.
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| 关 键 词： | 锂离子电池 固体电解质相界面膜 碳酸锂 电化学阻抗谱 |
| 收稿时间： | 2010-01-21 |
Effects of Li_2CO_3 Additive on the Performance of Graphite Electrode |
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| TIAN Lei-Lei,ZHUANG Quan-Chao,WANG Rong,CUI Yong-Li,FANG Liang,QIANG Ying-Huai.Effects of Li_2CO_3 Additive on the Performance of Graphite Electrode[J].Chemical Research In Chinese Universities,2010,31(12):2468-2473. |
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| Authors: | TIAN Lei-Lei ZHUANG Quan-Chao WANG Rong CUI Yong-Li FANG Liang QIANG Ying-Huai |
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| Affiliation: | TIAN Lei-Lei,ZHUANG Quan-Chao,WANG Rong,CUI Yong-Li,FANG Liang,QIANG Ying-Huai(Lithium-ion Batteries Laboratory,School of Materials Science and Engineering,China University of Mining and Technology,Xuzhou 221116,China) |
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| Abstract: | Effects of Li2CO3 additive in 1 mol/L LiPF6-EC(ethylene carbonate):DMC(dimethyl carbonate) electrolyte(1:1,mass ratio) on electrochemical performance of graphite electrode were investigated by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) in the first lithiation process.The CV results show that electrochemical performance of the graphite electrode is improved by adding Li2CO3 into 1 mol/L LiPF6-EC:DMC electrolyte and the single electron reduction of EC,namely decomposes to ethylene ... |
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| Keywords: | Lithium ion battery Solid electrolyte interface film Li2CO3 Electrochemical impedance spectroscopy |
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