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.