MnTiO_3/C复合材料的制备及其电化学性能研究

Synthesis and electrochemical performance of MnTiO_3/C composites

为提高锂离子电池负极材料循环稳定性和倍率性能,采用溶剂热和高温热处理方法制备了MnTiO_3/C锂离子电池负极材料。应用场发射扫描电子显微镜(FESEM)、X射线衍射(XRD)和恒电流循环充放电等测试方法对材料结构形貌、物相组成和电化学性能进行分析测试。TiO_2的加入和碳包覆提高了电池负极材料的循环稳定性,缓解了材料体积效应并增加了电导率。MnTiO_3/C复合材料在1 000 m A·g^(-1)的电流密度下充放电循环160次后放电比容量仍有466 m A·h·g^(-1),是一种具有良好应用前景的锂离子电池负极材料。

In order to improve the cycle stability and rate performance of anode materials for lithium ion batteries,MnTiO3/C composites were prepared by hydrothermal and thermal treatment as anode materials for lithium ion batteries.The structure,morphology and electrochemical performance of the materials were analyzed by field emission scanning electron microscopy(FESEM),X-ray diffraction(XRD)and galvanostatic charging and discharging method.The addition of TiO2 and carbon coating improved the cycle stability of the material,relieved the volume effect of the material and increased the conductivity.The discharge capacity of MnTiO3/C composites is about 466 mA·h/g at the current density of 1 000 mA/g after 160 charge-discharge cycles,which will be a kind of promising anode material for lithium ion batteries.