One-Pot Method for Synthesizing Spherical-Like Metal Sulfide-Reduced Graphene Oxide Composite Powders with Superior Electrochemical Properties for Lithium-Ion Batteries
- Authors
- Park, Gi Dae; Choi, Seung Ho; Lee, Jung-Kul; Kang, Yun Chan
- Issue Date
- 15-9월-2014
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- energy conversion; energy-storage materials; nanostructures; reduced graphene oxides; synthesis design
- Citation
- CHEMISTRY-A EUROPEAN JOURNAL, v.20, no.38, pp.12183 - 12189
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMISTRY-A EUROPEAN JOURNAL
- Volume
- 20
- Number
- 38
- Start Page
- 12183
- End Page
- 12189
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/97390
- DOI
- 10.1002/chem.201403471
- ISSN
- 0947-6539
- Abstract
- A facile, one-pot method for synthesizing spherical-like metal sulfide-reduced graphene oxide (RGO) composite powders by spray pyrolysis is reported. The direct sulfidation of ZnO nanocrystals decorated on spherical-like RGO powders resulted in ZnS-RGO composite powders. ZnS nanocrystals with a size below 20 nm were uniformly dispersed on spherical-like RGO balls. The discharge capacities of the ZnS-RGO, ZnO-RGO, bare ZnS, and bare ZnO powders at a current density of 1000 mAg(-1) after 300 cycles were 628, 476, 230, and 168 mAhg(-1), respectively, and the corresponding capacity retentions measured after the first cycles were 93, 70, 40, and 21 %, respectively. The discharge capacity of the ZnS-RGO composite powders at a high current density of 4000 mAg(-1) after 700 cycles was 437 mAhg(-1). The structural stability of the highly conductive ZnS-RGO composite powders with ultrafine crystals during cycling resulted in excellent electrochemical properties.
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