1. Improving the electrochemical properties of Cr-SnO2 by multi-protecting method using graphene and carbon-coating.
- Author
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Yang, Ting, Liu, Yongkang, and Zhang, Ming
- Subjects
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ELECTROCHEMISTRY , *METALLIC oxides , *GRAPHENE , *STANNIC oxide , *ELECTRIC conductivity , *QUANTUM dots - Abstract
Designing heteroatom doped metal oxides and modifying them with carbonaceous materials can grant metal oxides with good Li + storage performance because of the improved structure stability and enhanced electric conductivity. Herein, monodispersed Cr-doped SnO 2 quantum dots fixed by graphene nanosheets and carbon layers (C/Cr-SnO 2 /G) were successfully assembled, which showed excellent cyclic stability, high reversible capacity and remarkable rate capability for Li + storage. According to the characteristics results, 3.8 wt% Cr were uniformly incorporated into SnO 2 lattice in form of Cr 3 + , resulting the decrease of SnO 2 diameters. The C/Cr-SnO 2 /G electrodes displayed an excellent reversible capacity of 672 mA h g − 1 after 200 cycles at 100 mA g − 1 without apparent capacity fading throughout the test, and still retained a stable specific capacity of 296 mA h g − 1 even at 5 A g − 1 . The enhanced electrochemical performances of C/Cr-SnO 2 /G can be related to incorporation of Cr into lattice of SnO 2 and the double structure protections by graphene nanosheets and carbon layers, which can easily obtain quantum dots structure, increase the conductivity, and keep the structure stability. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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