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Received:May 09, 2013
Received:May 09, 2013
中文摘要: 采用固相合成方法制备了双层碳包覆Li4Ti5O12复合材料.通过X射线衍射、扫描电子显微镜、循环伏安、电化学阻抗和恒流充放电分析等测试,研究了产物的结构、形貌及电化学性能.结果表明:通过碳包覆改性后,Li4Ti5O12的容量可明显提高,碳的包覆对Li4Ti5O12的结构没有影响;2 C倍率下首次放电比容量为118.8 mAh/g,300次循环后放电比容量仍为108.5 mAh/g,容量保持率为91.3%,具有非常好的电化学性能.
Abstract:Double layer carbon coated Li4Ti5O12 materials ale prepared in a solid-state method. The structure, surface morphology and electrochemical properties of the products are characterized by X-ray diffraction, scanning electron microscopy, cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge.It is found that carbon coating significantly improves the capacity of Li4Ti5O12.Carbon layer distributes on the surface of Li4Ti5O12 without destroying the crystal structure of the bulk material.The obtained Li4Ti5O12/C composite delivers a 11igh initial discharge capacity of 118.8mAh/g at 2C rate and the capacity retention is 91.3% after 300 cycles, indicating superior electrochemical performance.
文章编号：20140117 中图分类号： 文献标志码：
基金项目:085工程项目"智能电网储能技术";上海市浦江人才计划(11pj1404200)
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