The precursors of Li_4Ti_5O_(12) were prepared by sol-gel method and the Li_4Ti_5O_(12) sam- ples were synthesized by calcining.The structure and surface species of Li_4Ti_5O_(12) were characterized by thermogravimetry(TG),X-ray diffraction(XRD),infrared spectroscopy (IR) and Raman spectroscopy. The effects of the synthesis temperatures on the structure and species of Li_4Ti_5O_(12) were systematically investigated.The results revealed that two types of TiO_2 were formed and coexisted when the synthesis tem...