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-642
Subject Surface modified Carbon based anode materials for lithium ion battery
Authors Jin Ung Hwang, Jong Dae Lee1, Ji Sun Im2,*
Department of Chemical Engineering Chungbuk Natioanl University, Korea Research Institute of Chemical Technology, Korea
1Department of Chemical Engineering, Chungbuk Natioanl University, Korea
2Korea Research Institute of Chemical Technology, Korea
Abstract In recent years, carbon-based materials have been extensively investigated as an anode material for Li-ion battery(LIB). 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 have performed the surface modification of PFO(Pyrolysis Fuel Oil) based pitch by the chemical activation with KOH. Pitch was prepared by heat treatment the PFO at 420℃ for 3h. The preparation method has been optimized through the analysis of diverse experimental variables such as the molarity of KOH solution and stirring time. In addition, it shows that chemical activation with KOH solution can be successfully used to develop PFO with appropriate surface area and mean pore size. In this study, the effect of activated solution malar ratio and stirring time on electrochemical performances was investigated. The prepared modified pitch was analyzed by BET and FE-SEM. Also the electrochemical performances of modified PFO pitch 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:DEC=1:1 vol%). The coin cell using modified PFO pitch(KOH 7M 2h stirring) has better initial capacity than that of other composition coin cells. Also, modified PFO anode appeared a initial columbic efficiency of 84% and the retention rate capability was 91%. It is found that prepared carbon anode showed improved cycling and rate capacity performance.
E-mail hwangjw@krict.re.kr