Abstract: The effects of high temperature solid state synthesis condition on the structure, micro-morphology, pore diameter distribution and electrochemical properties of spinel Li₄Ti₅O_l2 for an Li₄Ti₅O₁₂/C hybrid electrochemical capacitor were investigated by XRD, SEM, BET and charge/discharge tests. The results show that the Li₄Ti₅O₁₂ sample obtained at 800℃ for 2 h has rich mesopores and exhibits better electrochemical properties. Its BET surface area reaches 4.4 m²·g^-1 the specific capacity reaches approximately 150 mAh·g^-1 when charged and discharged at 175 mÅg^-l and the power performance and cyclelife is superior.