Preparation and characterization of high-density spherical Li 4Ti 5O 12 anode material for lithium secondary batteries
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.