以山茶花瓣为模板合成多孔片层结构 MnO2及其电化学性能

摘要

The biomorphic MnO 2 materials with lamellar porous structure were successfully synthesized by using camellia petal as biotemplate and MnNO 3 solution of 0.01,0.03,0.05,0.10 mol•L-1 as precursor.Their structure and morphology were characterized.And then lithium-ion battery was assembled by using MnO 2 as negative electrode material,the electrochemical properties of MnO 2 was tested.Results show that all MnO 2 contained α,βandεform MnO 2 crystals.The specific surface area and pore volume of MnO 2 respectively increased from 8.81 cm2•g-1 to 39.82 cm2•g-1 and from 0.08 cm3 •g-1 to 0.26 cm3•g-1 with the concentration of precursor solution increased from 0.01 mol•L-1 to 0.10 mol•L-1 .In addition,the first coulombic efficiency of lithium-ion battery was more than 22.56%,and the reversible capacity of the battery could still maintain 70 mAh•g-1 after 10 cycles.%以山茶花瓣为模板,以0．01,0．03,0．05,0．10 mol•L－1 MnNO3溶液为前驱体,采用浸渍煅烧的方法合成了具有山茶花瓣微观形貌的多孔片层状 MnO2,并对它的结构和形貌进行了表征；然后将 MnO2作为负极材料安装成扣式锂离子电池,测定了 MnO2的电化学特性.结果表明：合成的MnO2中均含有α、β和ε晶型的 MnO2；随着前驱体溶液浓度由0．01 mol•L－1增至0．10 mol•L－1,制备的 MnO2的比表面积由8．81 cm2•g－1增至39．82 cm2•g－1,孔容由0．08 cm3•g－1增至0．26 cm3•g－1；电池的首次库伦效率均大于22．56％,经过10次循环后的可逆容量仍能保持70 mAh•g－1.