Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 23, Pages 6858-6864Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta10399d
Keywords
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Funding
- National Natural Science Foundation of China [61271126, 21201060]
- Program for Science and Technology Project of Heilongjiang province [WB10A204, WB12A101, GZ11A103]
- Program for Innovative Research Team in University [IRT-1237]
- Innovation Team of Heilongjiang University [Hdtd2010-04]
- Heilongjiang province Postdoctoral Fund [LBH-Z11037]
- Heilongjiang Educational Department [2011CJB006, 2013TD002]
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In this paper, a facile and template-free solvothermal method has been developed to synthesize yolk-shell MoO2 microspheres. The as-synthesized MoO2 microspheres are composed of both a uniform porous shell of 80 nm in thickness and a porous core constructed from primary MoO2 nanocrystal clusters of 20 nm in size. Importantly, the unique yolk-shell MoO2 microspheres exhibit excellent electrochemical performance. At a current density of 50 mA g(-1), they can deliver a high specific capacity of 955 mA h g(-1) in the first discharge and retain a reversible capacity of 847.5 mA h g(-1) after 50 cycles. Meanwhile, even at a high current density of 2000 mA g(-1), they also exhibit a specific capacity of 450 mA h g(-1). This superior electrochemical performance of the as-synthesized MoO2 microspheres could be ascribed to their special yolk-shell structure, which could not only provide short Li-ion and electron pathways, but also accommodate large volume variation.
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