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(s)
Bin Wang; Jaegeon Ryu; Sungho Choi; Gyujin Song; Dongki Hong; Chihyun Hwang; Xiong Chen; Bo Wang; Wei Li; Hyun-Kon Song; Soojin Park; Rodney S .Ruoff
Publication Date
2018-01
Journal
ACS NANO, v.12, no.2, pp.1739 - 1746
Publisher
AMER CHEMICAL SOC
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. © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/4723
ISSN
1936-0851
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
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