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곽상규

Kwak, Sang Kyu
Kyu’s MolSim Lab @ UNIST
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Graphene-wrapped Porous Sb Anodes for Sodium-Ion Batteries by Mechanochemical Compositing and Metallomechanical Reduction of Sb2O3

Author(s)
Hwang, ChihyunChoi, SinhoJung, Gwan YeongYang, JuchanKwak, Sang KyuPark, SoojinSong, Hyun-Kon
Issued Date
2017-10
DOI
10.1016/j.electacta.2017.08.166
URI
https://scholarworks.unist.ac.kr/handle/201301/22767
Fulltext
http://www.sciencedirect.com/science/article/pii/S0013468617318261?via%3Dihub
Citation
ELECTROCHIMICA ACTA, v.252, pp.25 - 32
Abstract
Antimony metal nanoparticles wrapped with a-few-layer graphene coat (Sb@Gn) were fabricated from their oxide form (Sb2O3) in a micrometer dimension using a novel two-step ball-milling process. The first mechanochemical process was designed to decrease the particle size of Sb2O3 microparticles for ensuring advantages of nano size and to subsequently coat the Sb2O3 nanoparticles with a-few-layer graphene (Sb2O3@Gn). The second metallomechanical ball-milling process reduced the oxide to its metal form (Sb@Gn) by the help of Zn as a metallic reductant. The graphene layer (@Gn) blocked the alloying reaction between Sb and Zn, limiting the size of Sb particles during the metallomechanical reduction step. During reduction, oxygen species were transferred from of Sb2O3 through @Gn to Zn along redox transfer pathways rather than direct mass transfer via unsaturated vacancies in the @Gn. the redox transfer involving oxidation of @Gn by O-2 is plausible routes for O-2 transfer in the metallomechanical reduction. The Sb@Gn anode exhibited outstanding capacity retention along charge/discharge cycles and improved rate capability in sodium-ion batteries. The @Gn provided conductive pathways to the Sb core and limited size expansion during sodium-lithium alloying.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
ISSN
0013-4686
Keyword (Author)
antimony anodehigh-energy ball millingmechanochemical reactionmetallomechanical reductionsodium-ion batteries
Keyword
HIGH-PERFORMANCEHIGH-CAPACITYNA-IONSTORAGESPECTROSCOPYPARTICLESHYBRIDOXIDEXPS

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