Electrochemical behavior and stability of Li4Ti5O12 in a broad voltage window

Electrochemical behavior and stability of spinel Li4Ti5O12 are investigated in a broad voltage window (0.0-5.0 V vs. Li/Li+). The voltage profile of the Li4Ti5O12 electrode shows a plateau region at 1.55 V and two sloped regions below 1.55 V when the electrode is cycled between 0.0 and 2.0 V. It is found that Li4Ti5O12 maintains high lithium storage characteristic with the increase of the current density. Moreover, Li4Ti5O12 shows excellent rate performance in 0.0-2.0 V and good cyclic performances in 0.0-4.0 and 1.0-5.0 V. Besides, the crystal structure is kept when it is cycled between 0.0 and 5.0 V.