Carbon-coated tungsten diselenide nanosheets uniformly assembled on porous carbon cloth as flexible binder-free anodes for sodium-ion batteries with improved electrochemical performance
- Authors
- Kim, Inha; Park, Sung-Woo; Kim, Dong-Wan
- Issue Date
- 25-6월-2020
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Electrical explosion of wire; Dip coating; Tungsten diselenide; Porous carbon cloth; Carbon coating; Sodium-ion battery
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.827
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ALLOYS AND COMPOUNDS
- Volume
- 827
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/54971
- DOI
- 10.1016/j.jallcom.2020.154348
- ISSN
- 0925-8388
- Abstract
- As large-scale energy storage systems, rechargeable sodium-ion batteries (SIBs) are promising to replace the lithium-ion batteries. Among transition-metal dichalcogenides, which exhibit high theoretical capacities and specific two-dimensional layered structures, tungsten diselenide (WSe2) is an efficient anode material for SIBs owing to the good energetics and large lattice parameter. In this study, well-crystallized WSe2 nanosheets uniformly assembled on a porous carbon cloth (WSe2@PCC) were fabricated by an underwater electrical explosion of a tungsten wire, dip coating, and complete selenization from WO3 to WSe2. To further improve the cycling performance of the WSe2@PCC electrode, a carbon coating was carried out by simply adding sucrose into a WO3 ink before dip coating. The carbon-coated WSe2@PCC (C@WSe2@PCC) electrode exhibited outstanding electrochemical performances as a flexible and binder-free anode for SIBs due to enhanced electrical conductivity and mitigation of volume expansion of WSe2 during repeated sodiation/desodiation. Benefiting from unique structural merits and efficient carbon coating, C@WSe2@PCC can deliver large reversible areal capacity of 1.37 and 1.05 mA h cm(-2) at the 1st and 150th cycles, respectively, with excellent capacity retention and Coulombic efficiency even at a high current density of 0.75 mA cm(-2). (C) 2020 Elsevier B.V. All rights reserved.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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