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제125회 대한화학회 학술발표회 및 총회
Li-O2 battery based on Au nanosheets covered carbon cathode through hydro dipping process
2020년 2월 6일 16시 04분 29초
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, Seok Ju Kang
, Geondae Moon
School of energy and chemical engineering/ Dongnam regional division, Ulsan National Institute of Science and Technology/ Korea Institute of Industrial Technology, Korea
School of energy and chemical engineering, Ulsan National Institute of Science and Technology, Korea
Dongnam regional division, Korea Institute of Industrial Technology, Korea
Recently, Li-O2 batteries have received much attention as high-energy-storage systems due to their high energy density compared to conventional Li-ion batteries. However, there are a lot of drawbacks such as dendrite formation on the Li-metal surface, high overpotential, and low ratio between the oxygen-evolution reaction (OER) and the oxygen-reduction reaction (ORR). Fundamentally, the specific energy and rechargeability of Li-O2 battereis are determined by ORR and OER rates at the cathode electrode. The strategy for increasing the ratio of cathodic reactions, many materials have been studied as a cathodic catalyst such as novel metals, metal oxides, and carbon-free catalyst. In this study, we demonstrated a novel and high performance Li-O2 battery with Au nanosheets (Au NSs) covered carbon cathode processed by hydro dipping method. Firstly, two dimensional gold colloidal nanosheets was synthesized by solution-based method with shape-guiding agent. For assembling of carbon cathode electrode with 2D Au NSs, hydro-dipping process was introduced by exploiting a monolayer of Au NSs on water surface. 2D Au NSs was assembled on the water surface and transferred to fabricate electrode with carbon material without any binders. A simple route for fabricating Au catalyst on carbon cathode not only reduced the assembling steps of cathode electrode but also enhanced the battery performance in the Li-O2 battery.
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