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Construction of yolk--shell Fe3O4@C nanocubes for highly stable and efficient lithium-ion storage |
Ruiping LIU(), Chao ZHANG, Xiaofan ZHANG, Fei GUO, Yue DONG, Qi WANG, Hanqing ZHAO |
Department of Materials Science and Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China |
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Abstract The yolk–shell Fe3O4@C nanocubes were successfully synthesized through carbothermic reduction process from carbon-coated α-Fe2O3 precursor. The results show that the yolk–shell Fe3O4@C nanocubes are uniformly coated with a thin carbon layer, and a clear cavity about 150 nm in width between Fe3O4 core and carbon shell are formed due to the volume shrinkage during the reduction treatment. The obtained yolk–shell Fe3O4@C nanocubes exhibit excellent cycling stability (the discharge capacity is 709.7 mA·h/g after 100 cycles at the current density of 0.1C) and rate performance (1023.4 mA·h/g at 0.1C, 932.5 mA·h/g at 0.2C, 756.1 mA·h/g at 0.5C, 405.6 mA·h/g at 1C, and 332.3 mA·h/g at 2C, and more importantly, when the current density finally backs to 0.1C, a capacity of 776.8 mA·h/g can be restored). The outstanding lithium storage properties may be attributed to the unique yolk–shell structures.
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Keywords
Fe3O4
yolk--shell
nanocube
anode
lithium storage
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Corresponding Author(s):
Ruiping LIU
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Online First Date: 07 November 2018
Issue Date: 10 December 2018
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