Abstract: In order to enhance electrical conductivity and rate capability of Li4Ti5O12, the Li4Ti5O12 /C powder was prepared by the sol-gel method, using PEG as carbon source. The performance of Li4Ti5O12 /C coated by three different molecular weight carbon sources: PEG (400, 600, and 1000), was investigated with TG, XRD, SEM, TEM, constant current charge-discharge, rate discharge and EIS. The material obtained by using PEG1000 as carbon source had the best electrochemical performance. Initial discharge capacity was 143.5 mA·h·g⁻¹ at 0.1C rate, and discharge capacity remained 105 mA·h·g⁻¹ at 2C rate, capacity retention ratio was 73.17%, in addition, it had the smallest resistance.