锂离子电池负极材料Li_4Ti_5O_(12)的结构和性能

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

合成了锂离子电池负极材料钛酸锂(Li_4Ti_5O_(12)),并将结构单一、组成较纯的钛酸锂负极材料组装成电池,研究了合成温度对钛酸锂结构及物种的影响．结果表明,合成温度低于650℃时生成两种结构的TiO_2,严重影响了钛酸锂的结构,合成温度高于650℃时TiO_2逐渐消失,在800℃保温24 h之后得到单相Li_4Ti_5O_(12),电化学性能良好．

The precursors of Li4Ti5O12 were prepared by sol-gel method and the Li4Ti5O12 samples were synthesized by calcining. The structure and surface species of Li4Ti5O12 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 Li4Ti5O12 were systematically investigated. The results revealed that two types of TiO2 were formed and coexisted when the synthesis temperature was below 650 ℃, which adversely influenced the structure of Li4Ti5O12, and TiO2 gradually disappeared after the synthesis temperature was above 650 ℃. Single-phase and pure Li4Ti5O12 with excellent electrochemical performance was obtained after the sample was prepared at 800 ℃ and kept heated for 24 h.