2015年

2015年

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·g1 at 0.1C rate, and discharge capacity remained 105 mA·h·g1 at 2C rate, capacity retention ratio was 73.17%, in addition, it had the smallest resistance.