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采用在碱性条件下的水热法,合成了钛酸钠纳米棒,在此基础上用熔融盐离子交换方法制备了钛酸锂中间体,在400～700℃的空气气氛下烧结,得到的纳米棒状Li-Ti-O化合物由贫锂的锐钛矿结构LixTiO2和立方尖晶石结构Li4Ti5O12两相构成。用恒电流充放电研究了其电化学嵌/脱锂性能。结果表明,经600℃热处理的纳米棒状Li-Ti-O化合物具有最佳的比容量、循环稳定性和高倍率放电性能。
The sodium titanate nanorods were synthesized by the hydrothermal method under basic conditions. On the basis of this, the lithium titanate intermediates were prepared by the molten salt ion exchange method and sintered under the atmosphere of 400 ~ 700 ℃. The nanorod-shaped Li-Ti-O compound is composed of two phases of Li-lean anatase LixTiO2 and cubic spinel Li4Ti5O12. The electrochemical intercalation / delithiation performance was studied by constant current charge and discharge. The results show that the nanocrystalline Li-Ti-O compound annealed at 600 ℃ has the best specific capacity, cycle stability and high rate discharge performance.