Preparation and characterization of high-density spherical Li_4Ti_5O_(12) anode material for lithium secondary batteries

摘要

Li_4Ti_5O_(12) is a very promising anode material for lithium secondary batteries. A novel technique has been developed to prepare Li_4Ti_5O_(12). The spherical precursor is prepared via an "inner gel" method by TiCl_4 as the raw material. Spherical Li_4Ti_5O_(12) powders are synthesized by sintering the mixture of spherical precursor and Li_2CO_3. The investigation of XRD, SEM and the determination of the electrochemical properties show that the Li_4Ti_5O_(12) powders prepared by this method are spherical, and have high tap-density and excellent electrochemical performance. It is tested that the tap-density of the product is as high as 1.64 g cm~(-3), which is remarkably higher than the non spherical Li_4Ti_5O_(12). Between 1.0 and 3.0 V versus Li, a reversible capacity is as high as 161 mAh g~(-1) at a current density of 0.08 mA cm~(-2).