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Author

Song, Hyun-Kon
eclat: ElectroChemistry Lab of Advanced Technology
Research Interests
  • Electrochemical analysis, electroactive materials, electrochemistry-based energy devices

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Folding Graphene Film Yields High Areal Energy Storage in Lithium-Ion Batteries

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Title
Folding Graphene Film Yields High Areal Energy Storage in Lithium-Ion Batteries
Author
Wang, BinRyu, JaegeonChoi, SunghoSong, GyujinHong, DongkiHwang, ChihyunChen, XiongWang, BoLi, WeiSong, Hyun-KonPark, SoojinRuoff, Rodney S.
Keywords
folding; graphene composite films; high areal capacity; high mass loading; lithium-ion batteries
Issue Date
201802
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.12, no.2, pp.1739 - 1746
Abstract
We show that a high energy density can be achieved in a practical manner with freestanding electrodes without using conductive carbon, binders, and current collectors. We made and used a folded graphene composite electrode designed for a high areal capacity anode. The traditional thick graphene composite electrode, such as made by filtering graphene oxide to create a thin film and reducing it such as through chemical or thermal methods, has sluggish reaction kinetics. Instead, we have made and tested a thin composite film electrode that was folded several times using a water-assisted method; it provides a continuous electron transport path in the fold regions and introduces more channels between the folded layers, which significantly enhances the electron/ion transport kinetics. A fold electrode consisting of SnO2/graphene with high areal loading of 5 mg cm-2 has a high areal capacity of 4.15 mAh cm-2, well above commercial graphite anodes (2.50-3.50 mAh cm-2), while the thickness is maintained as low as ∼20 μm. The fold electrode shows stable cycling over 500 cycles at 1.70 mA cm-2 and improved rate capability compared to thick electrodes with the same mass loading but without folds. A full cell of fold electrode coupled with LiCoO2 cathode was assembled and delivered an areal capacity of 2.84 mAh cm-2 after 300 cycles. This folding strategy can be extended to other electrode materials and rechargeable batteries.
URI
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DOI
http://dx.doi.org/10.1021/acsnano.7b08489
ISSN
1936-0851
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