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

doi:10.3866/PKU.WHXB201704145

Abstract

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, 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 0.1 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.

Key words: Lithium-ion battery, Lithium-rich cathode materials, LiFePO₄ coating, High Columbic efficiency, Cyclability

Lei. HE,Jun-Min. XU,Yong-Jian. WANG,Chang-Jin. ZHANG. 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 Phys. -Chim. Sin. 2017, 33(8), 1605-1613. doi: 10.3866/PKU.WHXB201704145

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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

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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