Citation: HE Lei, XU Jun-Min, WANG Yong-Jian, ZHANG Chang-Jin. LiFePO₄-Coated Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ as Cathode Materials with High Coulombic Efficiency and Improved Cyclability for Li-Ion Batteries[J]. Acta Physico-Chimica Sinica, ;2017, 33(8): 1605-1613. doi: 10.3866/PKU.WHXB201704145 shu

LiFePO₄-Coated Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ as Cathode Materials with High Coulombic Efficiency and Improved Cyclability for Li-Ion Batteries

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

Received Date: 2 March 2017
Revised Date: 27 March 2017

Fund Project: 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, 11504379).

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, Li_1.2Mn_0.54Ni_0.13Co_0.13O₂. 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 0.1C (1C=300 mA·g^-1), and excellent cyclability with a capacity of 206.7 mAh·g^-1after 100 cycles at 1C. 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.
- Lithium-ion battery,
- Lithium-rich cathode materials,
- LiFePO₄ coating,
- High Columbic efficiency,
- Cyclability
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沈阳化工大学材料科学与工程学院沈阳 110142

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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通讯作者: 陈斌, bchen63@163.com

LiFePO₄-Coated Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ as Cathode Materials with High Coulombic Efficiency and Improved Cyclability for Li-Ion Batteries