Study On Novel Lithium Titanate As Anode Material For Lithium Ion Battery

Li₄Ti₅O₁₂ has spinel structure and exhibits no structural change (so called"zero strain"material). It has advantages in reversibility, kinetic of charge-discharge process and safety performance, and becomes the hotspot of research in anode material. In this article, in order to improve the high-rate performance, Li₄Ti₅O₁₂ nanoparticles and nanosheets were synthesized through hydrothermal method. The structure and morphology characteristics of the composite were investigated by XRD, SEM, TG et al. Meanwhile, electrochemical properties were analyzed through CV, EIS and charge-discharge test.Li₄Ti₅O₁₂ nanoparticles with particle size around 20nm were synthesized through hydrothermal method. The infection of the synthesis condition of Li₄Ti₅O₁₂ prepared with hydrothermal method was investigated. The results demonstrated that materials achieved best electrochemical property when calcined at 500℃. The prepared Li₄Ti₅O₁₂ nanoparticles had good rate performance and cycling performance. It exhibited a discharging capacity of 134.9mAh/g at a high rate of 8C. The capacity at 1C after 100 cycles could also attained 160.3mAh/g, close to the theory capacity of Li₄Ti₅O₁₂ material.Spinel Li₄Ti₅O₁₂ nanosheets were synthesized by hydrothermal process. The size was around 200-400nm and thickness was less than 5nm. The Brunauer-Emmett-Teller specific surface area of the sample was 104.3m2/g. The prepared Li₄Ti₅O₁₂ nanosheets had fine rate charge-discharge performance. When being cycled at 10C, 20C, 30C, 40C, 50C for 50 cycles separately, it maintained a specific capacity of 95mAh/g at 50C after 250 cycles.