A New Concept for Obtaining SnO2 Fiber-in-Tube Nanostructures with Superior Electrochemical Properties
- Authors
- Hong, Young Jun; Yoon, Ji-Wook; Lee, Jong-Heun; Kang, Yun Chan
- Issue Date
- 2-1월-2015
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- anode materials; cyclic voltammetry; electrospinning; lithium-ion batteries; nanotubes; tin oxide
- Citation
- CHEMISTRY-A EUROPEAN JOURNAL, v.21, no.1, pp.371 - 376
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMISTRY-A EUROPEAN JOURNAL
- Volume
- 21
- Number
- 1
- Start Page
- 371
- End Page
- 376
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/94666
- DOI
- 10.1002/chem.201405146
- ISSN
- 0947-6539
- Abstract
- Tin oxide (SnO2) nanotubes with a fiber-in-tube structure have been prepared by electrospinning and the mechanism of their formation has been investigated. Tin oxide-carbon composite nanofibers with a filled structure were formed as an intermediate product, which were then transformed into SnO2 nanotubes with a fiber-in-tube structure during heat treatment at 500 degrees C. Nanofibers with a diameter of 85 nm were found to be located inside hollow nanotubes with an outer diameter of 260 nm. The prepared SnO2 nanotubes had well-developed mesopores. The discharge capacities of the SnO2 nanotubes at the 2nd and 300th cycles at a current density of 1 Ag-1 were measured as 720 and 640 mAhg(-1), respectively, and the corresponding capacity retention measured from the 2nd cycle was 88%. The discharge capacities of the SnO2 nanotubes at incrementally increased current densities of 0.5, 1.5, 3, and 5 Ag-1 were 774, 711, 652, and 591 mAhg(-1), respectively. The SnO2 nanotubes with a fiber-in-tube structure showed superior cycling and rate performances compared to those of SnO2 nanopowder. The unique structure of the SnO2 nanotubes with a fiber@void@tube configuration improves their electrochemical properties by reducing the diffusion length of the lithium ions, and also imparts greater stability during electrochemical cycling.
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