Al2O3/C-Composite Coated LiV3O8 As a Cathode Material for Lithium Ion Battery

LVO(LiV₃O₈) cathode coated with alumina(Al₂O₃) and carbon composite is successfully synthesized via sol-gel method process. Al₂O₃/C composite was expected to enhance the electrical conductivity and mechanical strength of LVO. To analyze the effect of Al₂O₃/C, coating depths with different thickness were investigated controlling the concentration of precursor. The interfacial characteristics were examined by SEM, EDS, TEM, and XPS. The cell with the concentration of 2wt.% Al₂O₃/C showed the best electrochemical performance. And the initial discharge capacity of the cell with 2wt.% Al₂O₃/C-coated LVO cathode was 280 mAh g^-1 at 0.2 C-rate. The capacity retention and structural stability of Al₂O₃/C coated LVO was higher than pristine LVO after 100^th cycle. Additionally, the rate capability test was conducted also showing the enhanced stability on each cycles attributed by Al₂O₃/C composite coating. From the results above, it can be concluded that the Al₂O₃/C composite coating on LVO can improve the electrochemical performance of LVO.