One-Pot Synthesis of CoSex-rGO Composite Powders by Spray Pyrolysis and Their Application as Anode Material for Sodium-Ion Batteries
- Authors
- Park, Gi Dae; Kang, Yun Chan
- Issue Date
- 14-3월-2016
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- electrochemistry; graphene; metal selenides; nanostructures; sodium-ion batteries
- Citation
- CHEMISTRY-A EUROPEAN JOURNAL, v.22, no.12, pp.4140 - 4146
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMISTRY-A EUROPEAN JOURNAL
- Volume
- 22
- Number
- 12
- Start Page
- 4140
- End Page
- 4146
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/89215
- DOI
- 10.1002/chem.201504398
- ISSN
- 0947-6539
- Abstract
- A simple one-pot synthesis of metal selenide/reduced graphene oxide (rGO) composite powders for application as anode materials in sodium-ion batteries was developed. The detailed mechanism of formation of the CoSex-rGO composite powders that were selected as the first target material in the spray pyrolysis process was studied. The crumple-structured CoSex-rGO composite powders prepared by spray pyrolysis at 800 degrees C had a crystal structure consisting mainly of Co0.85Se with a minor phase of CoSe2. The bare CoSex powders prepared for comparison had a spherical shape and hollow structure. The discharge capacities of the CoSex-rGO composite and bare CoSex powders in the 50th cycle at a constant current density of 0.3Ag(-1) were 420 and 215mAhg(-1), respectively, and their capacity retentions measured from the second cycle were 80 and 46%, respectively. The high structural stability of the CoSex-rGO composite powders for repeated sodium-ion charge and discharge processes resulted in superior sodium-ion storage properties compared to those of the bare CoSex powders.
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