121st General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code ELEC.P-603
Subject Electrochemical Characteristics of Pitch Coated Silicon/Graphite Anode Composites
Authors Su Hyeon Lee, Jong Dae Lee*
Department of Chemical Engineering, Chungbuk Natioanl University, Korea
Abstract In recent years, carbon-based materials have been extensively investigated as an anode material for Li-ion battery (LIB). Because of their low material cost, abundance, nontoxicity and good capacity, carbon materials have been considered promising materials for LIB anodes in portable electronic devices and electric/hybrid vehicles. Despite these advantages, the practical application of carbon-based materials in many electronic device and electric/hybrid vehicles is still limited by its poor electrochemical performances. To enhance these electrochemical performances, we synthesized pitch coated Silicon/Graphite composites as an anode material. Pitch coated Silicon/Graphite composites were prepared by the fabrication processes including the synthesis of silica nanoparticles, magnesiothermic reduction of silica nanoparticles, and silicon attachment on the surface of graphite by carbonization of pitch. In this study, the effects of concentration of TEOS and NH3, mixing speed, and temperature on particle size of silica nanoparticles were investigated. Prepared pitch coated Silicon/Graphite composites were analysed by TGA, XRD and FE-SEM. Also the electrochemical performances of pitch coated Silicon/Graphite composites as the anode were investigated by constant current charge/discharge, cyclic voltammetry and electrochemical impedance tests in the electrolyte of LiPF6 dissolved in organic solvents(EC:DMC:EMC=1:1:1 vol%). The result shows that the anode electrode of pitch coated Silicon/Graphite composite is able to improve the capacity and cycle stability considerably. This is because the pitch layer encapsulating silicon nanoparticle forms passivation films on graphite surfaces and improves the structural stability.
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