氧化锰薄膜的制备及其电化学性能

Simple synthesis of Mn O film and its enhanced electrochemical performance

采用简单的水热法制备了锰氧化物薄膜前驱体,并结合后期热还原处理制备了基于镍基底的氧化锰薄膜材料,将其作为锂离子电池负极材料,研究其电化学性能。利用X射线衍射(XRD)、扫描电镜(SEM)等手段表征了样品的成分、形貌和结构。通过充放电测试和循环伏安等方法对材料的电化学性能做了测试。由于纳米结构的活性物质直接生长在导电性基底上,该氧化锰薄膜材料具有较高的放电比容量(0.2C放电比容量为684 m A·h/g),优越的倍率性能(5C和20C下放电比容量分别为450 m A·h/g和174 m A·h/g)和良好的循环性能,在0.5C下经过60次循环,其放电比容量仍保持在470 m A·h/g。实验结果表明,该方法合成的氧化锰纳米结构薄膜是一种很有前景的锂离子电池负极材料。

MnO film precursor directly fabricated on nickel substrate were prepared by hydrothermal method with a subsequent sintering reduction process.The composition,morphology,and structure of this MnO film were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM） etc.Galvanostatic charging/discharging measurements,and cyclic voltammetry（CV） were used to test the electrochemical performance of the as-prepared material. Results showed that MnO film displayed excellent lithium storage property when it was directly served as anode electrode in lithium-ion battery. The MnO/Li half cell can deliver discharge capacity of 684,450,and 174 m A·h/g at 0.2C,5C,and 20 C respectively.After cycling at 0.5C for 60 times,the discharge capacity can still maintain 470 m A·h/g.The experimental results suggested that this MnO film is a promising anode material for lithium-ion batteries.