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Title: There-dimensional porous carbon network encapsulated SnO2 quantum dots as anode materials for high-rate lithium ion batteries
Authors: Yang, J
Xi, LH
Tang, JJ
Chen, F
Wu, LL
Zhou, XY
Keywords: Lithium ion battery
3D porous carbon network
Homogeneous SnO2 quantum dots
Issue Date: 2016
Publisher: Pergamon Press
Source: Electrochimica acta, 1 Nov. 2016, v. 217, p. 274-282 How to cite?
Journal: Electrochimica acta 
Abstract: SnO2 quantum dots have attracted enormous interest, since they have been shown to effectively minimize the volume change stress, improve the anode kinetic and shorten the lithium ion migration distance when used as anode materials for lithium ion battery. In this work, we report a facile strategy to fabricate nanostructure with homogenous SnO2 quantum dots anchored on three-dimensional (3D) nitrogen and sulfur dual-doped porous carbon (NSGC@SnO2). Characterization results show that the obtained SnO2 quantum dots have an average critical size of 3-5 nm and uniformly encapsulated in the porous of NSGC matrix. The as-designed nanostructure can effectively avoid the aggregation of SnO2 quantum dots as well as accommodate the mechanical stress induced by the volume change of SnO2 quantum dots and thus maintain the structure integrity of the electrode. As a result, the obtained NSGC@SnO2 composite exhibits a specific reversible capacity as high as 1118 mAh g(-1) at a current of 200 mA g(-1) after 100 cycles along with a high coulombic efficiency of 98% and excellent rate capability.
ISSN: 0013-4686
DOI: 10.1016/j.electacta.2016.09.086
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