Preparation and Characterization of Porous Spherical Li_4Ti_5O_(12)/C Anode Material for Lithium Ion Batteries

Titanium,lithium and carbon source compounds were mixed by ball milling firstly,then the slurry was spray dried to prepare spherical precursor.The porous spherical spinel Li4Ti5O12/C powders were synthesized by calcining the precursor.XRD,SEM,TEM,BET testing and determination of the electrochemical properties show that the prepared Li4Ti5O12/C powders are in form of spherical particles which is composed of nanocrystals.The specific surface area of Li4Ti5O12/C powders is as high as 39.5 m2/g.The initial discharge specific capacities of the Li4Ti5O12/C anode reach 172.2,168.2 and 153.6 mAh/g at 0.1C,1C and 5.0C rates,respectively.The Li4Ti5O12/C anode also exhibits excellent cycle performance.The porous Li4Ti5O12 material coated by carbon displays excellent high rate performance and cycling stability.