Strategy for yolk-shell structured metal oxide-carbon composite powders and their electrochemical properties for lithium-ion batteries
- Authors
- Ju, Hyeon Seok; Hong, Young Jun; Cho, Jung Sang; Kang, Yun Chan
- Issue Date
- 4월-2016
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Yolk-shell; Carbon composite; Lithium ion battery; Spray pyrolysis
- Citation
- CARBON, v.100, pp.137 - 144
- Indexed
- SCIE
SCOPUS
- Journal Title
- CARBON
- Volume
- 100
- Start Page
- 137
- End Page
- 144
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/89021
- DOI
- 10.1016/j.carbon.2016.01.008
- ISSN
- 0008-6223
- Abstract
- A strategy for the preparation of metal oxide-carbon composite powders with yolk-shell structure by simple spray pyrolysis is introduced. Mn-Sn-O-C composite powders with yolk-shell structure representing the first target material are prepared by one-pot spray pyrolysis and their formation mechanism is evaluated. Phase separation of polyvinylpyrrolidone (PVP), Sn, and Mn components during the drying stage of droplets plays a key role in the formation of yolk-shell structured composite powders. The repeated combustion and contraction processes of the dried powders under N-2 atmosphere produce the desired Mn-Sn-O-C composite powders with yolk-shell structure. The shell and core parts of the yolk-shell powders prepared directly by spray pyrolysis at 900 degrees C are MnO-Mn2SnO4-C and Sn-Mn2SnO4-C composites, respectively. The initial discharge capacities of the composite powders prepared at 700 and 900 degrees C at the current density of 1 A g(-1) are 1058 and 1204 mA h g(-1), respectively. The discharge capacities of the composite powders prepared at 900 degrees C for the 2nd and 100th cycle are 803 and 784 mA h g(-1), respectively. The structural stability of the Mn-Sn-O-C composite powders with yolk-shell structure during cycling results in good electrochemical performance. (C) 2016 Elsevier Ltd. All rights reserved.
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