| LiFePO4包覆的Li1.2Mn0.54Ni0.13Co0.13O2锂离子电池正极材料:增强的库伦效率和循环性能 |
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| 作者单位： | 1. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, P. R. China;2. School of Physical Engineering, Key Laboratory of Material Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, P. R. China;3. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, P. R. China |
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| 基金项目： | The project was supported by the Scientific Research Grant of Hefei Science Center of Chinese Academy of Sciences(2015SRG-HSC025);and National Natural Science Foundation of China(U1532267);and National Natural Science Foundation of China(U11504379) |
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| 摘 要： |
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| 关 键 词： | 锂离子电池 富锂正极材料 磷酸铁锂包覆 高库仑效率 循环性能 |
| 收稿时间： | 2017-03-02 |
LiFePO4-Coated Li1.2Mn0.54Ni0.13Co0.13O2 as Cathode Materials with High Coulombic Efficiency and Improved Cyclability for Li-Ion Batteries |
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| Authors: | Lei HE Jun-Min XU Yong-Jian WANG Chang-Jin ZHANG |
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| Institution: | 1. High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, P. R. China;2. School of Physical Engineering, Key Laboratory of Material Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450052, P. R. China;3. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, P. R. China |
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| Abstract: | In this work, we present a new design for a surface protective layer formed by a facile aqueous solution process in which a nano-architectured layer of LiFePO4 is grown on a Li-rich cathode material, Li1.2Mn0.54Ni0.13Co0.13O2. The coated samples are then calcined at 400 or 500℃ for 5 h. The sample after calcination at 400℃ demonstrates a high initial columbic efficiency of 91.9%, a large reversible capacity of 295.0 mAh·g-1 at 0.1 C (1 C=300 mA·g-1), and excellent cyclability with a capacity of 206.7 mAh·g-1after 100 cycles at 1 C. Meanwhile, voltage fading of the coated sample is effectively suppressed by protection offered by a LiFePO4 coating layer. These superior electrochemical performances are attributed to the coating layer, which not only protects the Li-rich cathode material from side reaction with the electrolyte and maintains the stability of the interface structure, but also provides excess reversible capacity. |
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| Keywords: | Lithium-ion battery Lithium-rich cathode materials LiFePO4 coating High Columbic efficiency Cyclability |
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