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Surface modification by fluorine doping to increase discharge capacity of Li1.2Ni0.2Mn0.6O2 cathode materials

  • Yun-shan Jiang
  • Gang Sun
  • Fu-da Yu
  • Lan-fang Que
  • Liang Deng
  • Xiang-hui Meng
  • Zhen-bo WangEmail author
Original Paper
  • 19 Downloads

Abstract

Anion doping is considered as an effective method to tap the potential of Li-rich materials to obtain more discharge capacity. Here, we prepare fluorine-doped Li1.2Ni0.2Mn0.6O2 materials by a low-temperature secondary sintering. Rietveld refinements of XRD show an increase in lattice parameters and indicate a wider Li+ diffusion channel after fluorine doping. From TEM and HRTEM images, it is observed that the fluorine-doped sample displays a more pronounced layered appearance, and partial lattice fringes are slightly curved which may be caused by the substitution of F for O to break the symmetry of MnO6 octahedron. The fitting results of XPS show that Mn is partially oxidized and the local electronic environment of O changes. The best one shows a discharge capacity of 288 mAh/g at 0.1 C with a Coulombic efficiency of 95.9% in the first lap. And it performs a capacity retention of 91.0% after 100 cycles at 0.2 C.

Keywords

Li-rich cathode Fluorine doping High discharge capacity Surface local structure Li-ion batteries 

Notes

Acknowledgments

We are supported in part by the National Natural Science Foundation of China (grant no. 21273058, 21673064, and 51802059), China Postdoctoral Science Foundation (grant no. 2017M621285 and 2018T110292), and Harbin Technological Achievements Transformation Projects (2016DB4AG023), and acknowledge their financial support.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yun-shan Jiang
    • 1
  • Gang Sun
    • 1
  • Fu-da Yu
    • 1
  • Lan-fang Que
    • 1
  • Liang Deng
    • 1
  • Xiang-hui Meng
    • 2
  • Zhen-bo Wang
    • 1
    Email author
  1. 1.MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbinChina
  2. 2.Shandong ALLGRAND New Energy Technology Co., Ltd.DezhouChina

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