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- Title
Macroporous Fe<sub>3</sub>O<sub>4</sub>/Carbon Composite Microspheres with a Short Li<sup>+</sup> Diffusion Pathway for the Fast Charge/Discharge of Lithium Ion Batteries.
- Authors
Choi, Seung Ho; Ko, You Na; Jung, Kyeong Youl; Kang, Yun Chan
- Abstract
Macroporous Fe3O4/carbon composite and core-shell Fe3O4@carbon composite microspheres have been prepared by means of one-pot spray pyrolysis. The addition of polystyrene (PS) nanobeads to a spray solution containing an iron salt and poly(vinylpyrrolidone) (PVP) led to macroporous Fe3O4/carbon composite microspheres, the carbon and iron components of which are uniformly distributed over the entire composite microsphere. The pore-size distribution curve for the macroporous Fe3O4/carbon composite shows distinct peaks at around 10 and 80 nm. An electrode prepared from the macroporous Fe3O4/carbon composite microspheres showed better cycling and rate performances than an electrode formed from core-shell Fe3O4@carbon composite microspheres. The initial discharge and charge capacities of the macroporous Fe3O4/carbon composite microsphere electrode were determined to be 1258 and 908 mA h g−1 at 2 A g−1, respectively, and the corresponding initial coulombic efficiency was 72 %. The composite microsphere electrode cycled 500 times at 5 A g−1 showed a high discharge capacity of 733 mA h g−1.
- Subjects
MICROSPHERES; FORAMINIFERA; MOLECULAR vibration; PHYSICAL &; theoretical chemistry; ELECTRODES
- Publication
Chemistry - A European Journal, 2014, Vol 20, Issue 35, p11078
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201402359