纳米棒状Li-Ti-O化合物的制备与电化学嵌锂性能  

Preparation and Electrochemical Lithium Storage of the Li-Ti-O Compound Nanorods

作　　者：郗凯[1] 李颖[1] 

机构地区：[1]南开大学,天津300071

出　　处：《稀有金属材料与工程》2010年第11期2051-2054,共4页Rare Metal Materials and Engineering

摘　　要：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 via hydrothermal reaction in NaOH solution. Then the Li-Ti-O compound nanorods were prepared by a molten salt method in molten EiNO(3), which was involved in the ion-exchange process, and by calcination at 400-700 degrees C in air. It is found that Li-Ti-O compound was of nanorod morphology and underwent a phase transition to a mixture of Li-poor anatase Li(x)TiO(2) and spinel Li(4)Ti(5)O(12). The electrochemical lithium storage property was tested by constant current charge/discharge. Results demonstrate that the Li-Ti-O compound nanorods calcined at 600 degrees C have excellent specific capacity, good reversibility and high rate discharge capability.

关 键 词：纳米棒状 化合物 法制备 电化学 高倍率放电性能 恒电流充放电 循环稳定性 锐钛矿结构 尖晶石结构 离子交换 空气气氛 碱性条件 中间体 相构成 钛酸钠 钛酸锂 水热法 熔融盐 热处理 比容量 

分 类 号：O614.411[理学—无机化学]