Carbon microspheres with well-developed micro- and mesopores as excellent selenium host materials for lithium-selenium batteries with superior performances
- Authors
- Park, Gi Dae; Kim, Jong Hwa; Lee, Jung-Kul; Kang, Yun Chan
- Issue Date
- 21-11월-2018
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.6, no.43, pp.21410 - 21418
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 6
- Number
- 43
- Start Page
- 21410
- End Page
- 21418
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/71816
- DOI
- 10.1039/c8ta08727j
- ISSN
- 2050-7488
- Abstract
- As host materials for efficient selenium storage and utilization, porous carbon materials with optimized and suitable pore structures are important in the development of high-performance Li-Se batteries. Herein, the synergetic effect of micro- and mesopores of carbon materials on the conversion reaction of loaded chain-structured Se-n is studied for superior Li-Se batteries. Carbon microspheres with well-developed micro- and mesopores are synthesized by spray pyrolysis. Carbon-vanadium oxide composite microspheres synthesized by spray pyrolysis transform into microporous carbon microspheres (P-carbon) by etching of vanadium oxide. An additional post-treatment of the spray-pyrolysis product at 400 degrees C yields carbon microspheres (A4-carbon) with well-developed micro- and mesopores by etching of vanadium oxide. The presence of both micro- and mesopores in carbon is desirable to achieve a fast conversion reaction of Se-n in the Se-loaded carbon microspheres. The Se-loaded carbon microspheres with well-developed micro- and mesopores (A4-carbon/Se) exhibit higher capacities and stable long-term cycling performances compared with similar microspheres with only micropores (P-carbon/Se). The discharge capacities of P-carbon/Se and A4-carbon/Se at the 500(th) cycle at a current density of 0.5 A g(-1) are 403 and 582 mA h g(-1), respectively. Moreover, A4-carbon/Se microspheres exhibit a stable reversible capacity of 343 mA h g(-1) after 2000 cycles even at a high current density of 2.0 A g(-1); their capacity retention calculated from the 3(rd) cycle is 87%.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.