C-LiFePO4/聚三苯胺复合锂离子电池正极材料的制备与性能

doi:10.3866/PKU.WHXB201311072

Abstract

Abstract:

An olivine LiFePO₄/carbon (C-LiFePO₄) nanocrystallinematerial was prepared using a low-temperature solvothermalmethod, followed by a high-temperature post-annealing process. Then polytriphenylamine (PTPAn)-modified C-LiFePO₄ (C-LiFePO₄/PTPAn) was prepared, as a composite for novel cathodes for lithium-ion batteries, by solution blending of the C-LiFePO₄ nanocrystallinematerial and the electroactive conducting polymer PTPAn. The effects of PTPAn coating of the C-LiFePO₄/PTPAn samples were investigated using X-ray diffraction (XRD), scanning electronmicroscopy (SEM), transmission electronmicroscopy (TEM), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge testing. The results indicated that the solution blending method produced a compact PTPAn coating on the C-LiFePO₄, providing an effective electronic/ionic conducting pathway and enhancing the electrochemical activities of C-LiFePO₄-based composites. The C-LiFePO₄/10%(w) PTPAn electrode displayed an improved initial discharge capacity of 154.5mAh·g^-1 at 0.1C, a superior high-rate performance discharge capacity of 114.2 mAh·g^-1 at 10C, and excellent cycling stability.With further increases in the PTPAn content of the coating on the C-LiFePO₄/PTPAn composite, the electrochemical properties of the composite decreased. Electrochemical impedance measurements also demonstrated that the PTPAn coating significantly decreased the charge-transfer resistance of the C-LiFePO₄ electrode.

Key words: Lithium-ion battery, Polytriphenylamine, Cathode material, Solution blending method, Electrochemical property

MSC2000:

O646

SU Chang, HUANG Qi-Fei, XU Li-Huan, ZHANG Cheng. Preparation and Performances of C-LiFePO₄/Polytriphenylamine Composite as Cathode Material for Lithium-Ion Batteries[J].Acta Phys. -Chim. Sin., 2014, 30(1): 88-94.

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Preparation and Performances of C-LiFePO₄/Polytriphenylamine Composite as Cathode Material for Lithium-Ion Batteries

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