Structure and performance of lithium battery anode material Li_4Ti_5O_(12)

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 temperature was below 650℃,which adversely influenced the structure of Li_4Ti_5O_(12),and TiO_2 gradually disappeared after the synthesis temperature was above 650℃.Single-phase and pure Li_4Ti_5O_(12) with excellent electrochemical performance was obtained after the sample was prepared at 800℃and kept heated for 24 h.