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纳米棒状Li-Ti-O化合物的制备与电化学嵌锂性能
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Preparation and Electrochemical Lithium Storage of the Li-Ti-O Compound Nanorods
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    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。

    Abstract:

    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 LiNO3, which was involved in the ion-exchange process, and by calcination at 400-700 oC 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 LixTiO2 and spinel Li4Ti5O12. The electrochemical lithium storage property was tested by constant current charge/discharge. Results demonstrate that the Li-Ti-O compound nanorods calcined at 600 oC have excellent specific capacity, good reversibility and high rate discharge capability.

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郗 凯,李 颖.纳米棒状Li-Ti-O化合物的制备与电化学嵌锂性能[J].稀有金属材料与工程,2010,39(11):2051~2054.[Xi Kai, Li Ying. Preparation and Electrochemical Lithium Storage of the Li-Ti-O Compound Nanorods[J]. Rare Metal Materials and Engineering,2010,39(11):2051~2054.]
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  • 收稿日期:2009-12-16
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