Electrochemical properties of sulfur-doped Li4Ti5O12 anode material.

Lithium titanate (LTO) anode has Receded extensive attention due to IS high safety and long cycle life. Here, S atoms was doped into LTO as an anode material for lithium ion batteries by solvothermal method, and IS electrochemical properties were investigated. The X-ray diffraction (XRD) results showed that the introduced S atoms replaced Ti4+, which increased the late volume and conductivity of LTO. Scanning electron microscopy (SEM) results showed that the LTO particle size was reduced due to the interference of S atoms on the crystal growth of LTO. The rate performance of sulfur-doped LTO (S-LTO) was investigated by charge- discharge tests, and the results showed that S-LT()-1.5 had the best performance, exhibiting 143.8 mA • h/g at 20 C and still having 137.4 mA • h/g after 1000 cycles. The results of electrochemical impedance (EIS), cyclic voltammetry (CV) and galvanostatic intermittent titration technique (GITT) showed that the increased lattice volume and conductivity promoted the movement of Li+ and electrons in S-LTO-1.5, reduced the polarization, and thus enhanced electrochemical properties. [ABSTRACT FROM AUTHOR]