Citation: 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 Physico-Chimica Sinica, ;2014, 30(1): 88-94. doi: 10.3866/PKU.WHXB201311072 shu

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

1.
1 State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, P. R. China;
2 College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, P. R. China

Received Date: 6 August 2013
Available Online: 7 November 2013
Fund Project: 国家自然科学基金(51003095，51103132) (51003095，51103132)浙江省公益性技术应用研究计划(2010C31121)资助项目 (2010C31121)

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.
- Lithium-ion battery,
- Polytriphenylamine,
- Cathode material,
- Solution blending method,
- Electrochemical property
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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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