Journal
MATERIALS RESEARCH BULLETIN
Volume 50, Issue -, Pages 95-102Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2013.10.024
Keywords
Nanostructures; Solvothermal; Electrochemical properties; Transmission electron microscopy (TEM)
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Funding
- National Nature Science Foundation of China [51172287]
- Laboratory Research Fund by the State Key Laboratory of Powder Metallurgy, China
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A facile one pot strategy of a hydrothermal methodology was applied to synthesize the carbon coated MoO2 (MoO2@C) nanostructured particles, which are composed of ultra fine nanoparticles with homogeneous carbon coating about several nanometers. As an electrode in lithium ion batteries, the MoO2@C shows a high specific capacity and reversible capacity (730 mA h g(-1) after 60 cycles). Microstructure investigations, by using a high resolution transmission electron microscopy, of the MoO2@C based electrodes employed at various states during the first discharge/charge cycle were conducted to elucidate the lithium ion uptake/removal mechanism and cycling behavior. In the lithium uptake process, the original MoO2 phase transfers into Li0.98MoO2 through an addition type reaction, and then nanosized metallic Mo emerges as a result of a conversion reaction. In turn, Mo could be oxidized to the intermediate Li0.98MoO2 before converting to hyperfine MoO2 phase on upcoming lithium removal process. (C) 2013 Elsevier Ltd. All rights reserved.
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