Electrochemical Behavior of Li 4 Ti 5 O 12 /CNT Composite for Energy Storage

Abstract

The Li4Ti5O12/CNT composite is prepared by ultrasound associated sol-gel method. The prepared composite is characterized by SEM, TEM, XRD and TG analysis, and their elec- trochemical behaviors are investigated by cyclic voltammetry, electrochemical impedance spec- − troscopy and charge-discharge test in 1M LiBF4/PC electrolyte. From the results, it is identified that the Li4Ti5O12 nanoparticles coated on CNT surface have regular size with around 10~30 nm and spinel-framework structure. At the current rate of 20C, the discharge capacities of Li4Ti5O12/ CNT composites with CNT contents of 15, 30 and 50 wt% are 57, 63 and 48mAhg 1, respectively, which have similar value. The improved electrochemical behavior of the Li4Ti5O12/CNT composite electrode is attributed to the addition of CNT with electronic conductivity