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Baek, Jong-Beom
Center for Dimension-Controllable Organic Frameworks
Research Interests
  • Covalent Organic Frameworks (COFs), Carbon Nanotubes(CNTs), graphene, Energy Conversion and Storage

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Edge-thionic acid-functionalized graphene nanoplatelets as anode materials for high-rate lithium ion batteries

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Title
Edge-thionic acid-functionalized graphene nanoplatelets as anode materials for high-rate lithium ion batteries
Author
Fan, QinghuaNoh, Hyuk-JunWei, ZengxiZhang, JiakuiLian, XinMa, JianminJung, Sun-MinJeon, In-YupXu, JiantieBaek, Jong-Beom
Issue Date
2019-08
Publisher
Elsevier Ltd
Citation
NANO ENERGY, v.62, pp.419 - 425
Abstract
Although lithium ion batteries (LIBs) hold great promise as a next generation power supply, the poor rate capability of the graphite that is mainly used as the battery anode limits high-performance LIBs. Compared to other reported carbon-based materials, however, its relatively low average working voltage still makes it attractive. Herein, we were able to introduce carbon disulfide (CS2) at the edges of graphene nanoplatelets (GnPs) with rich –C=S/-C-S bonds via ball-milling graphite in the presence of CS2. The resultant edge-thionic acid-functionalized GnPs (TAGnPs) exhibited a larger accessible surface area and smaller particle size than pristine graphite. Importantly, the TAGnPs retained a long-range-ordered layered structure similar to pristine graphite. When the TAGnPs were used as anode materials for LIBs, they displayed superior rate capability (e.g., high average reversible capacities of 228.3, 208.1, 141.0 and 80.6 mAh g−1 at 0.5, 1, 2 and 5 A g−1, respectively) compared to pristine graphite and the reference edge-hydrogenated GnPs (HGnPs), which mainly have -C-H bonds at their edges. Theoretical calculations also indicated that the presence of –C=S/-C-S bonds at the edges of TAGnPs enabled stronger Li+ adsorption capability.
URI
https://scholarworks.unist.ac.kr/handle/201301/30383
URL
https://www.sciencedirect.com/science/article/pii/S2211285519304410?via%3Dihub
DOI
10.1016/j.nanoen.2019.05.035
ISSN
2211-2855
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