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Rare Metals

, Volume 36, Issue 5, pp 397–402 | Cite as

Reorganizing electronic structure of Li3V2(PO4)3 using polyanion (BO3)3 : towards better electrochemical performances

  • Yu Li
  • Ying Bai
  • Zhi Yang
  • Zhao-Hua Wang
  • Shi Chen
  • Feng Wu
  • Chuan WuEmail author
Article

Abstract

Doping modification of electrode materials is a sought-after strategy to improve their electrochemical performance in the secondary batteries field. Herein, polyanion (BO3)3−-doped Li3V2(PO4)3 cathode materials were successfully synthesized via a wet coordination method. The effects of (BO3)3− doping content on crystal structure, morphology and electrochemical performance were explored by X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). All the as-prepared samples have the same monoclinic structure; among them, Li3V2(PO4)2.75(BO3)0.15 sample has relatively uniform and optimized particle size. In addition, this sample has the highest discharge capacity and the best cycling stability, with an initial discharge capacity of 120.4 mAh·g−1, and after 30 cycles at a rate of 0.1C, the discharge capacity still remains 119.3 mAh·g−1. It is confirmed that moderate polyanion (BO3)3− doping can rearrange the electronic structure of the bulk Li3V2(PO4)3, lower the charge transfer resistance and further improve the electrochemical behaviors.

Keywords

Lithium-ion batteries Cathode materials Li3V2(PO4)3 Polyanion doping (BO3)3− 

Notes

Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (No.2016YFB0100500) and the Beijing Co-construction Project (No. 20150939014).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringBeijing Institute of TechnologyBeijingChina
  2. 2.Collaborative Innovation Center of Electric Vehicles in BeijingBeijingChina

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