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http://dx.doi.org/10.14579/MEMBRANE_JOURNAL.2020.30.1.38

Surface Modification of Li Metal Electrode with PDMS/GO Composite Thin Film: Controlled Growth of Li Layer and Improved Performance of Lithium Metal Battery (LMB)  

Lee, Sanghyun (Department of Chemical Engineering, Kwangwoon University)
Seok, Dohyeong (Department of Chemical Engineering, Kwangwoon University)
Jeong, Yohan (Department of Chemical Engineering, Kwangwoon University)
Sohn, Hiesang (Department of Chemical Engineering, Kwangwoon University)
Publication Information
Membrane Journal / v.30, no.1, 2020 , pp. 38-45 More about this Journal
Abstract
Although Lithium metal battery (LMB) has a very large theoretical capacity, it has a critical problem such as formation of dendrite which causes short circuit and short cycle life of the LMB. In this study, PDMS/GO composite with evenly dispersed graphene oxide (GO) nanosheets in poly (dimethylsiloxane) (PDMS) was synthesized and coated into a thin film, resulting in the effect that can physically suppress the formation of dendrite. However, PDMS has low ion conductivity, so that we attained improved ion conductivity of PDMS/GO thin film by etching technic using 5wt% hydrofluoric acid (HF), to facilitate the movement of lithium (Li) ions by forming the channel of Li ions. The morphology of the PDMS/GO thin film was observed to confirm using SEM. When the PDMS/GO thin film was utilized to lithium metal battery system, the columbic efficiency was maintained at 87.4% on average until the 100th cycles. In addition, voltage profiles indicated reduced overpotential in comparison to the electrode without thin film.
Keywords
lithium metal battery; PDMS/GO thin film; ion transport; dendrite growth control;
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Times Cited By KSCI : 2  (Citation Analysis)
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