γ-MnS花状微球的水热制备及其电化学性能

Hydrothermal Preparation and Electrochemical Performance of γ-MnS with Flowerlike Microsphere Morphology

基于硫代乙酰胺和高锰酸钾之间的氧化还原反应,采用水热法制备了MnS材料。应用X-射线衍射和扫描电镜技术对制备材料的结构和形貌进行表征。结果表明,当硫代乙酰胺和高锰酸钾的配比为2:1时,所得材料为六方纤锌矿结构的γ-MnS,具有空心棒组装成的花球形貌。反应物的配比和反应温度对产物的物相和形貌有显著影响。电化学测试结果显示,γ-MnS作为锂离子电池负极材料具有高的比容量、较好的循环稳定性和倍率性能。电流密度为0. 1 A/g时,首次放电比容量高达1623. 8 m Ah/g。恒流充放电100次后,比容量为556. 7 m Ah/g。

MnS was prepared based on the redox reaction between thioacetamide and potassium permanganate with a hydrothermal method.The prepared materials were characterized by X-ray diffraction and scanning electron microscopy.Characterization results show the material isγ-MnS with a hexagonal wurtzite crystal structure and it presents flowerlike hierarchical architecture built up of hollow rods when the ratio of thioacetamide to potassium permanganate is 2∶1.The ratio of reactants and reaction temperature have significant effects on the phase and morphology of the products.Electrochemical measurements indicateγ-MnS exhibits high specific capacity,good cycling stability and rate capability as an anode material.It delivers an initial discharge capacity of 1623.8 mAh/g at the current density of 0.1 A/g.And it shows the capacity of 556.7 mAh/g at the 100th cycle.