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Electrochemical performance of LiV3O8/PPy composite materials synthesized by the non-water system
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College of Chemistry and Environmental Engineering,Shenzhen University,College of Chemistry and Environmental Engineering,Shenzhen University,College of Chemistry and Environmental Engineering,Shenzhen University,College of Chemistry and Environmental Engineering,Shenzhen University,College of Chemistry and Environmental Engineering,Shenzhen University

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NSFC; the Natural Science Foundation of Guangdong

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    Abstract:

    LiV3O8/polypyrrole (PPy) composite materials were prepared by an oxidative polymerization of pyrrole monomer on the surface of LiV3O8 using ethanol as medium, FeCl3 as oxidant, benzene sulfonic acid sodium salt as dopant. The crystal structures and microstructures of LiV3O8/PPy were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). The electrochemical properties of the composites were investigated with galvanostatic charge–discharge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results show that 10nm pyrrole was uniformly polymerized around the LiV3O8, and the PPy-coating did not alter the crystal structure of the LiV3O8. LiV3O8/PPy composite material containing 6% PPy (LVP6) exhibits perfect electrochemical properties, its first discharge capacity reaches a high specific discharge capacity of 274 mAh/g and maintains a stable capacity of 239.4 mAh/g within 100 cycles at the charge–discharge rate of 0.1 C and in the voltage range of 1.8~4.0 V, the capacity retention is 87.4%. But the pure LiV3O8 shows that the first discharge capacity is 227.4 mAh/g and the discharge capacity is 160.1 mAh/g after 100 cycles, the capacity retention is only about 70.4%. LiV3O8/PPy composite materials show better cycling performance than the pure LiV3O8.

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[Chuan Shi, Shengming Hu, Xiangzhong Ren, Yuan Gao, Peixin Zhang. Electrochemical performance of LiV3O8/PPy composite materials synthesized by the non-water system[J]. Rare Metal Materials and Engineering,2018,47(S2):277~281.]
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History
  • Received:December 04,2017
  • Revised:December 04,2017
  • Adopted:February 01,2018
  • Online: November 01,2018
  • Published: