层状二氧化锰材料的制备及其电化学性能研究

Preparation and electrochemical performance of layered manganese dioxide

以高锰酸钾和5-氨基四唑为原料,采用常压加热法,制备了层状二氧化锰材料。应用X-射线衍射和扫描电镜技术对所得材料的结构和形貌进行表征。结果表明,所得材料具有层状结构,为颗粒状;恒流充放电测试显示,制备材料具有较好的电化学性能,在50 mA/g的电流密度下,首次充电比容量为761 mAh/g,循环50圈后,容量保持率为50%。此外,制备材料具有良好的倍率性能。

Layered manganese dioxide was prepared based on KMnO4 and 5-aminotetrazole as raw materials.The obtained material was characterized by X-ray diffraction and scanning electron microscopy.Results showed that the product was birnessite-type layered manganese dioxide which consisted of nearly monodisperse particles.The constant current charge-discharge measurement indicated that the as-prepared material showed preferable electrochemical properties.Manganese dioxide anode exhibited an initial charge capacity of 761 mAh/g at the current density of 50 mA/g.And the capacity retention is 50% after 50 cycles.Moreover,the material possess good rate properties.