Three-dimensional porous microspheres comprising hollow Fe2O3 nanorods/CNT building blocks with superior electrochemical performance for lithium ion batteries
- Authors
- Park, Seung-Keun; Park, Gi Dae; Kang, Yun Chan
- Issue Date
- 21-6월-2018
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, v.10, no.23, pp.11150 - 11157
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOSCALE
- Volume
- 10
- Number
- 23
- Start Page
- 11150
- End Page
- 11157
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/74901
- DOI
- 10.1039/c8nr02686f
- ISSN
- 2040-3364
- Abstract
- It is highly desirable to develop anode materials with rational architectures for lithium ion batteries to achieve high-performance electrochemical properties. In this study, three-dimensional porous composite microspheres comprising hollow Fe2O3 nanorods/carbon nanotube (CNT) building blocks are successfully constructed by direct deposition and further thermal transformation of beta-FeOOH nanorods on CNT porous microspheres. The CNT porous microsphere, which is prepared by a spray pyrolysis, provides ample sites for the direct growth of beta-FeOOH nanorods. During the further oxidation process, the beta-FeOOH nanorods are transformed into hollow Fe2O3 nanorods as a result of dehydroxylation and lattice shrinkage, resulting in the formation of hollow Fe2O3 nanorods/CNT porous microspheres. Such a hierarchical structure of composite microspheres not only facilitates electrolyte accessibility but also offers conductive networks for electrons during electrochemical reactions. Accordingly, the electrodes exhibit a high discharge capacity of 1307 mA h g(-1) after 300 cycles at a current density of 1 A g(-1); this is associated with an excellent capacity retention of 84%, which is calculated from the initial cycle. In addition, the composite delivers a discharge capacity of 703 mA h g(-1) at a current density of 15 A g(-1).
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