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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Electrochemical properties of surface modified Li3V2(PO4)3/C cathode materials in lithium ion batteries

2014년 8월 28일 16시 07분 05초
ELEC.P-1239 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
오례경, 홍정의, 류광선*
울산대학교 화학과, Korea
Rechargeable lithium ion batteries have been widely applied to the portable electronic devices, electrical vehicles, and energy storage systems due to its high energy density and rate capability. However, the current commercial cathode material, LiCoO2, suffers from several problems for large-scale applications due to its high cost and safety issues. From this aspect, the phosphate-based materials, which contain LiFePO4, LiMnPO4, and Li3V2(PO4)3, have been attracted. Among these things, Li3V2(PO4)3 (LVP) is most promising cathode material. Monoclinic LVP exhibits a theoretical capacity of ~197 mAh g-1 with three reversible lithium ions when charged to 4.8 V. However, low electronic conductivity of LVP induces its poor rate capability. To improve the electronic conductivity of LVP, many studies have been progressed such as carbon coating, metal doping, and surface modification. In this study, we studied about surface modified LVP/C to enhance the electronic conductivity and limit the direct contact with the electrolyte to protect side reaction in high voltage region. We selected Al2O3 and ZnO as surface coating materials. It can also repair the unconnected conducting pathways of carbon and improve the charge transfer process thorough the interface of active materials and electrolyte. X-ray diffraction and field emission-scanning electron microscopy were used to check the physical properties of pristine and surface modified LVP/C. Galvanostatic charge-discharge tests, rate performances, cyclic voltammetry, and electrochemical impedance spectroscopy were used to measure the electrochemical performances