1. Superior cycle performance and high reversible capacity of SnO2/graphene composite as an anode material for lithium-ion batteries.
- Author
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Liu, Lilai, An, Maozhong, Yang, Peixia, and Zhang, Jinqiu
- Subjects
LITHIUM-ion batteries ,ALKALI metal ions ,RAMAN spectroscopy ,SCANNING electron microscopes ,X-ray diffraction - Abstract
SnO
2 /graphene composite with superior cycle performance and high reversible capacity was prepared by a one-step microwave-hydrothermal method using a microwave reaction system. The SnO2 /graphene composite was characterized by X-ray diffraction, thermogravimetric analysis, Fourier-transform infrared spectroscopy, Raman spectroscopy, scanning electron microscope, X-ray photoelectron spectroscopy, transmission electron microscopy and high resolution transmission electron microscopy. The size of SnO2 grains deposited on graphene sheets is less than 3.5 nm. The SnO2 /graphene composite exhibits high capacity and excellent electrochemical performance in lithium-ion batteries. The first discharge and charge capacities at a current density of 100 mA g−1 are 2213 and 1402 mA h g−1 with coulomb efficiencies of 63.35%. The discharge specific capacities remains 1359, 1228, 1090 and 1005 mA h g−1 after 100 cycles at current densities of 100, 300, 500 and 700 mA g−1 , respectively. Even at a high current density of 1000 mA g−1 , the first discharge and charge capacities are 1502 and 876 mA h g−1 , and the discharge specific capacities remains 1057 and 677 mA h g−1 after 420 and 1000 cycles, respectively. The SnO2 /graphene composite demonstrates a stable cycle performance and high reversible capacity for lithium storage. [ABSTRACT FROM AUTHOR]- Published
- 2015
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