Preparation and Key Influencing Factors of Li_4Ti_5O_(12) as Electrode Material

Effects of sintering temperature,time and the lithium salts on the properties of Li_4Ti_5O_(12) synthesized by a solid-state-method were studied based on orthogonal experiments.The results show that sintering temperature is the most principal factor on the performance of Li_4Ti_5O_(12).Synthesized at proper sintering temperature with appropriate time,the product will have good electrochemical properties with finer particle size and better crystallinity.The high-rate discharge/charge property of Li_4Ti_5O_(12) prepared with LiNO_3 is much better.Li_4Ti_5O_(12) obgained at the optimum condition,namely preparing with LiNO_3 and sintering at 800℃for 12h,performs well when charged and discharged with high current density.It delivers discharge capacities of 151mAh·g~(-1),140mAh·g~(-1) and 115mAh·g~(-1) at the rate of 1C,2C and 5C,respectively,and shows good reversibility.