Synthesis and electrochemical properties of Li₄Ti₅O₁₂/C nano-powders by pulse jet spray pyrolysis

抄録

Li₄Ti₅O₁₂/C nano-powders were successfully synthesized at 500°C through the pulse jet spray pyrolysis with use of a citric acid aqueous solution. As-prepared Li₄Ti₅O₁₂/C nano-particles had spherical and irregular shapes with an average size of 50 nm. As-prepared Li₄Ti₅O₁₂/C nano-particles had a spinel phase with high crystallinity and a homogeneous chemical composition. The carbon content was 10 wt % in the Li₄Ti₅O₁₂ nano-powders. A 2032 type coin cell was used to examine electrochemical properties of the Li₄Ti₅O₁₂/C anode. The discharge capacity of Li₄Ti₅O₁₂/C anode exhibited 170 at 1 C and 120 mAh·g⁻¹ at 20 C, respectively. The discharge capacity of the Li₄Ti₅O₁₂/C anode maintained 96% of the initial discharge capacity after 500th cycle at 10 C and room temperature. The discharge capacity of the Li₄Ti₅O₁₂/C anode exhibited 160 mAh·g⁻¹ at 10 C and 50°C and maintained 98% of the initial discharge capacity after 100th cycle.