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Materials 2017, 10(4), 344; doi:10.3390/ma10040344

LiV3O8/Polytriphenylamine Composites with Enhanced Electrochemical Performances as Cathode Materials for Rechargeable Lithium Batteries

1,2
,
1,2,* , 3
,
1,2
and
1,2,*
1
School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, China
2
Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou City, Henan University of Technology, Zhengzhou 450001, China
3
School of Pharmacy, China Pharmaceutical University, Nanjing 211196, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Federico Bella
Received: 20 February 2017 / Revised: 19 March 2017 / Accepted: 21 March 2017 / Published: 26 March 2017
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Abstract

LiV3O8/polytriphenylamine composites are synthesized by a chemical oxidative polymerization process and applied as cathode materials for rechargeable lithium batteries (RLB). The structure, morphology, and electrochemical performances of the composites are characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, galvanostatic discharge/charge tests, and electrochemical impedance spectroscopy. It was found that the polytriphenylamine particles were composited with LiV3O8 nanorods which acted as a protective barrier against the side reaction of LiV3O8, as well as a conductive network to reduce the reaction resistance among the LiV3O8 particles. Among the LiV3O8/polytriphenylamine composites, the 17 wt % LVO/PTPAn composite showed the largest d100 spacing. The electrochemical results showed that the 17 wt % LVO/PTPAn composite maintained a discharge capacity of 271 mAh·g−1 at a current density of 60 mA·g−1, as well as maintaining 236 mAh·g−1 at 240 mA·g−1 after 50 cycles, while the bare LiV3O8 sample retained only 169 and 148 mAh·g−1, respectively. Electrochemical impedance spectra (EIS) results implied that the 17 wt % LVO/PTPAn composite demonstrated a decreased charge transfer resistance and increased Li+ ion diffusion ability, therefore manifesting better rate capability and cycling performance compared to the bare LiV3O8 sample. View Full-Text
Keywords: LiV3O8/polytriphenylamine composites; cathode materials; in situ chemical polymerization method; rechargeable lithium batteries; electrochemical performances LiV3O8/polytriphenylamine composites; cathode materials; in situ chemical polymerization method; rechargeable lithium batteries; electrochemical performances
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Li, W.; Zhu, L.; Yu, Z.; Xie, L.; Cao, X. LiV3O8/Polytriphenylamine Composites with Enhanced Electrochemical Performances as Cathode Materials for Rechargeable Lithium Batteries. Materials 2017, 10, 344.

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