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        Silicone oil-based selective SiOC coating onto hydrophobic rGO-MoS2 composite materials to achieve ultra-stable composite anodes in sodium-ion batteries

        Seunghak Lee,Eunjeong Seok,Haeun Kang,Dohyub Park,Minjun Kim,Dayoung Kam,Minsu Choi,Hyung-Seok Kim,Wonchang Choi 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-

        Molybdenum sulfide (MoS2) has a 2-D open framework structure and provide delocalized sodium ion diffusionand intercalation within the MoS2 structure. The structure exhibits a high theoretical capacity dueto its wide interlayer spacing (6.2 Å). Therefore, MoS2 has recently been used as an anode material insodium-ion batteries (SIBs). However, it exhibits inferior cycle performance and rate characteristicsdue to its low electronic conductivity and volume change during continuous operation, which restrictits use as an anode material in SIBs. Herein, a MoS2 surface modified with hydrophobic reduced grapheneoxide (rGO-MoS2) was dispersed in silicone oil, which is the starting material for silicon oxycarbide(SiOC), and subsequently used to prepare a MoS2 composite with a SiOC coating-layer surface modifiedwith rGO (rGO-MoS2@SiOC) via single pyrolysis reaction. rGO expands the interlayer spacing of MoS2,improving the electronic conductivity, and the SiOC layer capable of accommodating the volume expansionof MoS2 supports the insufficient buffer layer provided by rGO alone to form a conductive pathwaythat suppressed any adverse reactions at the electrode and electrolyte interface. The rGO-MoS2@SiOCcomposite exhibits a high reversible capacity of 532.5 mAh g1, no capacity fading even after 100 cycles,and superior rate characteristics.

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