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One-pot synthesis of core-shell-structured tin oxide-carbon composite powders by spray pyrolysis for use as anode materials in Li-ion batteries

Authors
Hong, Young JunKang, Yun Chan
Issue Date
7월-2015
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CARBON, v.88, pp.262 - 269
Indexed
SCIE
SCOPUS
Journal Title
CARBON
Volume
88
Start Page
262
End Page
269
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/93210
DOI
10.1016/j.carbon.2015.03.010
ISSN
0008-6223
Abstract
Core-shell-structured tin oxide-carbon composite powders with mixed SnO2 and SnO tetragonal crystals are prepared by one-pot spray pyrolysis from a spray solution with tin oxalate and polyvinylpyrrolidone (PVP). The aggregate, made up of SnOx nanocrystals (several tens of nanometers), is uniformly coated with an amorphous carbon layer. The initial discharge capacities of the bare SnO2 and SnOx-carbon composite powders at a current density of 1 A g(-1) are 1473 and 1667 mA h g(-1), respectively; their discharge capacities after 500 cycles are 78 and 1033 mA h g(-1), respectively. The SnOx-carbon composite powders maintain their spherical morphology even after 500 cycles. On the other hand, the bare SnO2 powder breaks into several pieces after cycling. The structural stability of the SnOx-carbon composite powders results in a low charge transfer resistance and high lithium ion diffusion rate even after 500 cycles at a high current density of 2 A g(-1). Therefore, the SnOx-carbon composite powders have superior electrochemical properties compared with those of the bare SnO2 powders with a fine size. (c) 2015 Elsevier Ltd. All rights reserved.
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