Abstract:
Li
4Ti
5O
12(M
1) was obtained by solid reaction process with LiNO
3 and TiO
2 as reactants. XRD analysis indicates that the main phase of the produced powder is Li
4Ti
5O
12 compound oxide with spinel structure. The initial discharge capacity of M
1 at 35 mA·g
-1 reaches 170 mAh·g
-1, which is comparable to the theoretical capacity, and the first coulombic efficiency is 92%. M
1 performs well when it charges and discharges with high current density, and the discharge capacities reach 151, 140 and 115 mAh·g
-1 at 175, 350 and 875 mA·g
-1, respectively. The discharge capacities of M
1, comparing with that of ME prepared by conventional solid-state sintering of LiOH and TiO
2, increase by 5%, 10% and 26% at 175, 350 and 875 mA·g
-1, respectively. Cyclic voltammogram suggests that the electrode of M
1 has low polarization, good reversibility and high electrochemical activity. The charge transfer resistances of M
1 measured through AC impedance are 16 and 2012 after lithium insertion and extraction, respectively.