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Acta Phys. -Chim. Sin.  2014, Vol. 30 Issue (1): 88-94    DOI: 10.3866/PKU.WHXB201311072
ELECTROCHEMISTRY AND NEW ENERGY     
Preparation and Performances of C-LiFePO4/Polytriphenylamine Composite as Cathode Material for Lithium-Ion Batteries
SU Chang1, HUANG Qi-Fei1, XU Li-Huan2, ZHANG Cheng1
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
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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 wordsLithium-ion battery      Polytriphenylamine      Cathode material      Solution blending method      Electrochemical property     
Received: 06 August 2013      Published: 07 November 2013
MSC2000:  O646  
Fund:  

The project was supported by the National Natural Science Foundation of China (51003095, 51103132) and Research on Public Welfare Technology Application Projects of Zhejiang Province, China (2010C31121).

Corresponding Authors: XU Li-Huan, ZHANG Cheng     E-mail: xulihuanss@163.com;czhang@zjut.edu.cn
Cite this article:

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. Acta Phys. -Chim. Sin., 2014, 30(1): 88-94.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201311072     OR     http://www.whxb.pku.edu.cn/Y2014/V30/I1/88

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