Synergistic Effect of Molecular-Type Electrocatalysts with Ultrahigh Pore Volume Carbon Microspheres for Lithium–Sulfur Batteries
SCIE
SCOPUS
- Title
- Synergistic Effect of Molecular-Type Electrocatalysts with Ultrahigh Pore Volume Carbon Microspheres for Lithium–Sulfur Batteries
- Authors
- WON, GWANG LIM; Mun, Yeongdong; Cho, A-Ra; Jo, Chang-Shin; Lee, Seong-Gyu; HAN, JEONG WOO; Lee, Jin-Woo
- Date Issued
- 2018-06
- Publisher
- AMER CHEMICAL SOC
- Abstract
- Lithium-sulfur (Li-S) batteries are regarded as potential high-energy storage devices due to their outstanding energy density. However, the low electrical conductivity of sulfur, dissolution of the active material, and sluggish reaction kinetics cause poor cycle stability and rate performance. A variety of approaches have been attempted to resolve the above issues and achieve enhanced electrochemical performance. However, inexpensive multifunctional host materials which can accommodate large quantities of sulfur and exhibit high electrode density are not widely available, which hinders the commercialization of Li-S batteries. Herein, mesoporous carbon microspheres with ultrahigh pore volume are synthesized, followed by the incorporation of Fe-N-C molecular catalysts into the mesopores, which can act as sulfur hosts. The ultrahigh pore volume of the prepared host material can accommodate up to similar to 87 wt % sulfur, while the uniformly controlled spherical morphology and particle size of the carbon microspheres enable high areal/volumetric capacity with high electrode density. Furthermore, the uniform distribution of Fe-N-C (only 0.33 wt %) enhances the redox kinetics of the conversion reaction of sulfur and efficiently captures the soluble intermediates. The resulting electrode with 5.2 mg sulfur per cm(2) shows excellent cycle stability and 84% retention of the initial capacity even after 500 cycles at a 3 C rate.
- Keywords
- Carbon; Electrocatalysts; Electrodes; Iron compounds; Lithium batteries; Lithium compounds; Microspheres; Particle size; Reaction intermediates; Reaction kinetics; Sound insulating materials; Sulfur compounds; Carbon microspheres; Conversion reactions; Electrical conductivity; Electrochemical performance; High-energy storage devices; Molecular catalysts; Spherical morphologies; Uniform distribution; Lithium sulfur batteries
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/92164
- DOI
- 10.1021/acsnano.8b02258
- ISSN
- 1936-0851
- Article Type
- Article
- Citation
- ACS Nano, vol. 12, no. 6, page. 6013 - 6022, 2018-06
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.