리튬 폴리머 전지용 정극활물질 $LiFePO_4$ 및 $LiM_xFe_{1-x}PO_4$의 전기화학적 특성

Electrochemical Properties of $LiFePO_4$ and $LiM_xFe_{1-x}PO_4$ Cathode Materials for Lithium Polymer Batteries

Phospho-olivine $LiFePO_4$ and $LiTi_{0.1}Fe_{0.9}PO_4$ cathode materials were prepared by the solid-state reaction. To improve conductivity we carried out electrochemical performance of $Ti^{2+}$ doped $LiFePO_4$. The $Ti^{2+}$ doped $LiFePO_4$ started 3.36 V of flat voltage on discharge curve and showed a gentle decline in the curve compared to undoped $LiFePO_4$ without great changes of capacity. And so, we could achieve to improve electrochemical performance as reversible, cycle life. Similarly, $LiFePO_4$ doping with $Ti^{2+}$ was showed the effect of dopant which was obtained the improved discharge capacity as 140 mAh/g and good cycling performance.