Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 694, Issue -, Pages 848-856Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.10.045
Keywords
Li-rich cathode material; Ultrathin layer; Zinc oxide; Surface modification; Electrochemical performance
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Funding
- Jiangsu Province Natural Science Fund Project [BK20130800]
- China Postdoctoral Science Foundation [2015M570433]
- Jiangsu Postdoctoral Science Research Foundation [1402030B]
- Opening Funding of National Laboratory of Solid State Microstructure [M28033]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Special Fund of the Scientific and Technological Achievements Transformation Project in Jiangsu Province [BA2013142]
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Ultrathin ZnO coatings with different thicknesses are successfully deposited onto the layered Li-rich oxide Li1.2Mn0.54Ni0.13Co0.13O2 via atomic layer deposition (ALD) technology, followed by annealing in Ar. The influence of ZnO layer on the structural and electrochemical performances of Li12Mn0.54Ni0.13Co0.13O2 cathode material is systematically investigated. In comparison with the pristine one, the ultrathin ZnO-coated electrodes exhibit the significantly improved discharge capacity and cycleability, particularly the LMNCO@ALD-ZnO-20 sample. The remarkably improved electrochemical performance of the coated sample is ascribed to the homogeneous ZnO coatings with high-quality, which could improve the electrode/electrolyte interface stability and the structural stability at high voltage, suppress the increasing charge transfer resistance during cycling, and favour the Li+ diffusion. (C) 2016 Elsevier B.V. All rights reserved.
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