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Ionics

, Volume 25, Issue 2, pp 411–419 | Cite as

Enhanced electrochemical properties of LiNi0.6Co0.2Mn0.2O2 cathode material by the diffusional Al2O3 coating layer

  • Xiaoling Cui
  • Ling Ai
  • Liping Mao
  • Yingchun Xie
  • Youwei Liang
  • Ningshuan Zhang
  • Yaohua Feng
  • Shengxian Wang
  • Shiyou LiEmail author
Original Paper
  • 117 Downloads

Abstract

The surface coating is a greatly effective approach to improve the electrochemical performance of the Ni-rich LiNi0.6Co0.2Mn0.2O2 cathode material. Herein, the traditional and diffusional Al2O3 coating ways are used to modify LiNi0.6Co0.2Mn0.2O2 cathode materials. Various analysis techniques, such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) were used to characterize materials. The results show that a thin and homogeneous Al2O3 coating layer was prepared on diffusional surface coating compared with traditional surface coating with a thick and uneven Al2O3 coating layer. The diffusional coating material exhibits the optimized electrochemical performance, with retention of 99.5% after 100 cycles at 1 C, and excellent rate performance. The electrochemical impedance spectroscopy further confirms that the superior electrochemical performance of diffusional Al2O3 coating sample can be attributed to the high-quality coating layer which is formed by the interface reactions between Al2O3 particles and the surface of LiNi0.6Co0.2Mn0.2O2 cathode material during high-temperature calcination. The outstanding coating layer not only protects the active material from the attack of electrolyte but also shortens Li+ diffusion path effectively during charge/discharge process. Based on the above results, the diffusional Al2O3 coating is considered as an effective surface modification method to improve the electrochemical performance of LiNi0.6Co0.2Mn0.2O2 materials.

Keywords

LiNi0.6Co0.2Mn0.2O2 Diffusion Al2O3 coating High-quality coating layer Electrochemical performance 

Notes

Funding information

This work is supported by the Natural Science Foundation of China (No. 21566021 and 21766017), the Transformation of Scientific and Technological Achievements of Gansu Institutions of Higher Education (No. 2017 D-04), and the Supporting Plan for Youth Innovative Talents of Longyuan.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Xiaoling Cui
    • 1
    • 2
  • Ling Ai
    • 1
  • Liping Mao
    • 1
    • 2
  • Yingchun Xie
    • 1
  • Youwei Liang
    • 1
    • 2
  • Ningshuan Zhang
    • 1
    • 2
    • 3
  • Yaohua Feng
    • 1
  • Shengxian Wang
    • 1
    • 2
  • Shiyou Li
    • 1
    • 2
    • 3
    Email author
  1. 1.College of Petrochemical TechnologyLanzhou University of TechnologyLanzhouPeople’s Republic of China
  2. 2.Gansu Engineering Laboratory of Cathode Material for Lithium-ion BatteryLanzhouChina
  3. 3.Qinghai Research Center of Low-temperature Lithium China -ion Battery Technology. EngineeringQinghai Green Grass New Energy Technology Co. Ltd.XiningPeople’s Republic of China

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