Enhanced Electrochemical Performance of Li_4Ti_5O_(12)/C Composite Prepared by Solid-state Method

摘要

Phase pure Li_4Ti_5O_(12)/C composite was synthesized by solid-state method using Li_2CO_3 and anatase TiO_2 as starting materials, and glucose, citric acid and oxalic acid as carbon sources, respectively. The effects of different carbon sources and various glucose amounts on the microstructure and electrochemical properties were systematically investigated. The as-prepared samples were characterized by means of XRD, SEM and particle size analysis. The electrochemical properties were investigated in terms of constant-current charge/discharge cycling tests. The results showed that the Li_4Ti_5O_(12)/C composite with 2wt% glucose exhibited the optimal electrochemical performance with a specific discharge capacity of 190.8mAh/g at 0.2C rate. The discharge capacity could still reach 151.0mAh/g after 80 cycles at 1C rate, exhibiting excellent cycling performance.