Chang L.-J.,Northeastern University China |
Chang L.-J.,Hebei Provincial Laboratory of Dielectric and Electrolyte Functional Materials |
Luo S.-H.,Northeastern University China |
Luo S.-H.,Hebei Provincial Laboratory of Dielectric and Electrolyte Functional Materials |
And 8 more authors.
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2014
Li4Ti5O12 was prepared by a combustion method using nano-TiO2 and LiNO3 as raw materials, and characterized by XRD, SEM, constant current charge-discharge, cyclic voltammetry and electrochemical impedance spectroscopy. The results show that when the molar ratio of urea to lithium is 1:1, the preset temperature for muffle furnace 850℃ and calcination time 8 h, the obtained pure phase spinel Li4Ti5O12 with the average particle size of 500 nm has better electrochemical performance. The initial discharge specific capacity of the material is as high as 168 mA·h/g at the current density of 0.1 C (1 C=170 mA·h/g) with a single voltage plateaus at around 1.5 V. The capacity remains 162 mA·h/g after 100 cycles and the retention rate of charged capacity is 96.4%. ©, 2014, Science Press. All right reserved.