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Ionics

, Volume 25, Issue 11, pp 5259–5267 | Cite as

Effect of Si doping on the structure and electrochemical performance of high-voltage LiNi0.5Mn0.5O2 cathode

  • Guofeng Jia
  • Xuehui ShangguanEmail author
  • Faqiang Li
  • Suqin Liu
  • Zhen He
Original Paper
  • 37 Downloads

Abstract

Despite its high energy density, high-voltage LiNi0.5Mn0.5O2 cathode which suffers from a poor cycle performance that originated from the cathode structural collapse is still far from commercialization. Doping heteroatom into the lattice of LiNi0.5Mn0.5O2 is believed to be a valid strategy in overcoming this bottleneck. Herein, Si was employed as a dopant to comprehensively improve the electrochemical performance of LiNi0.5Mn0.5O2. X-ray diffraction and Rietveld refinement revealed that doping Si into LiNi0.5Mn0.5O2 can optimize its structure, which reduced the degree of Li/Ni cation mixing. As a result, an enhanced interfacial reaction kinetics of Li-ion intercalation/de-intercalation could be achieved, rendering the doped LiNi0.5Mn0.5O2 a remarkably improved reversible capacity in comparison with its pristine. Moreover, it was found that Li0.99Si0.01Ni0.5Mn0.5O2 showed a significantly higher capacity than LiNi0.5Mn0.5O2 does at 25 °C. It is believed that this work affords an effective strategy for high-performance LiNi0.5Mn0.5O2 cathode.

Keywords

Lithium-ion battery LiNi0.5Mn0.5O2 cathode material Si doping High-voltage 

Notes

Funding information

This work was supported by the Science and Technology Project of Xining Science and Technology Bureau (2017-G-05) and the Hunan Provincial Science and Technology Plan Project (nos. 2016TP1007 and 2017TP1001).

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Copyright information

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

Authors and Affiliations

  • Guofeng Jia
    • 1
    • 2
    • 3
  • Xuehui Shangguan
    • 2
    • 3
    Email author
  • Faqiang Li
    • 2
    • 3
  • Suqin Liu
    • 1
  • Zhen He
    • 1
  1. 1.College of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Chemical Power Sources, and Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese ResourcesCentral South UniversityChangshaPeople’s Republic of China
  2. 2.Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt LakesChinese Academy of SciencesXiningPeople’s Republic of China
  3. 3.Key Laboratory of Salt Lake Resources Chemistry of Qinghai ProvinceXiningPeople’s Republic of China

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