Pitch-derived yolk-shell-structured carbon microspheres as efficient sulfur host materials and their application as cathode material for Li-S batteries
- Authors
- Park, Gi Dae; Jung, Dae Soo; Lee, Jung-Kul; Kang, Yun Chan
- Issue Date
- 1-10월-2019
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Pitch derived carbon; Yolk-shell structure; Porous carbon; Carbon microspheres; Lithium-sulfur batteries
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.373, pp.382 - 392
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 373
- Start Page
- 382
- End Page
- 392
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/62563
- DOI
- 10.1016/j.cej.2019.05.038
- ISSN
- 1385-8947
- Abstract
- Submicron and micron-sized carbon spheres with high electrical conductivity, micro-mesoporous structure, and empty space are considered ideal sulfur host materials for Li-S batteries. In this study, a new and efficient strategy for the synthesis of yolk-shell-structured carbon microspheres with multishells is introduced. Pitch-derived carbon microspheres with yolk-shell structure, high pore volume, and high electrical conductivity are synthesized by applying yolk-shell-structured Fe2O3 microspheres as a sacrificial template. Pitch-infiltrated Fe2O3 microspheres transform into yolk-shell-structured carbon (YS_C) microspheres with a specific conductivity of 0.9 S cm(-1) after post-treatment and etching with an HCl solution. The discharge capacity of the sulfur-loaded YS_C microspheres for the 200th cycle at a current density of 0.5 C is 686 mA h g(-1), and their reversible capacity after 800 cycles at a high current density of 2 C is 412 mA h g(-1). In addition, the sulfur-loaded YS_C microspheres show excellent cycling performance, despite their very high sulfur loading of 70 wt%. The excellent cycling and rate performances of the sulfur-loaded YS_C microspheres are attributed to the synergistic effect of the high electrical conductivity of YS_C microspheres, loading of amorphous and ultrafine sulfur, and empty shell layers.
- 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
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholar.korea.ac.kr/handle/2021.sw.korea/62563)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.