Journal
ELECTROCHIMICA ACTA
Volume 292, Issue -, Pages 217-226Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.09.158
Keywords
Cathode materials; Mo doping; Phase transformation; Lattice expansion; Electrochemical properties
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Funding
- National Key R&D Program of China [2016YFB0100301]
- National Natural Science Foundation of China [51472032, 21573017, U1664255, 51802020]
- China Postdoctoral Science Foundation [2017M620636, 2018T110050]
- Major achievements Transformation Project for Central University in Beijing
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Mo doped Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode materials have been synthesized via coprecipitation followed by high-temperature solid state method. The effect of Mo doping on the structure, morphology, and electrochemical performances of Ni-rich cathode material has been investigated. The results reveal that Mo doping may promote the formation of surface rock salt phase and expand the Li+ diffusion channels for Ni-rich material. Benefit from which, the further transition of layered to rock salt structure during cycling has been alleviated. As a result, the optimal Mo doped material, with 1 wt% doping, exhibits enhanced cycling stability with superior electrochemistry performances, that is high reversible capacity of 215.7 mAh g(-1) at 0.1C, and 184.1 mAh g(-1) at 1C with an excellent 100th capacity retention of 92.4%. Even the cut-off voltage raises to 4.5 V, the 100th capacity retention of Mo-doped material still reaches as high as 85.2%. The results indicate that fabricating the Ni-rich materials with a surface rock salt phase is an effective strategy towards better structure stability and electrochemical performances. (C) 2018 Published by Elsevier Ltd.
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