【作者】 刘怡； 徐融冰； 张卫新； 鲁道荣； 韩效钊；

【Author】 LIU Yi, XU Rong-bing, ZHANG Wei-xin, LU Dao-rong, HAN Xiao-zhao (School of Chemical Engineering, Hefei University of Technology, Hefei 230009, China)

【机构】 合肥工业大学化工学院；

【摘要】 分别以水热反应制得的MnOOH纳米棒、纳米线和Mn3O4纳米粒子为前驱体,与Li(OH)·H2O在500-800℃经固相反应合成不同纳米结构的Li2MnO3。产物较好地保持了前驱体的一维纳米结构(纳米棒)。用X 射线衍射(XRD)、透射电子显微镜(TEM)分别对产物进行表征,并对不同纳米结构的产物(纳米棒和纳米粒子) 进行了电化学性能研究。结果表明,作为电极材料,其结构与性能具有密切联系。分别以Li2MnO3纳米棒和纳米粒子制成电极进行充放电实验,其首次充电容量分别为123 mA·h/g和112 mA·h/g,放电容量为104 mA·h/g 和89 mA·h/g,到第5次充放电循环后放电容量降低到94 mA·h/g和87 mA·h/g。更多还原

【Abstract】 MnOOH nanorods (nanowires) and Mn3O4 nanoparticles prepared by the hydrothermal method were used as precursors, respectively, to prepare nanostructured Li2MnO3 by reacting with Li (OH) · H2O in the temperature range of 500 - 800℃ The precursor’s 1-D nanostructure(nanorod) was maintained in the product. The samples were characterized by XRD and TEM. The electrochemical properties of different nanostructured samples (nanorods and nanoparticles) were studied. The results indicate that as an electrode, the nanostructures of the products have influences on their electrochemical properties. The initial charge capacities of Li2 Mn()3 nanorods and nanoparticles used in an electrode are 123 mA · h/g and 112 mA · h/g, respectively, and the initial discharge capacities are 104 mA · h/g and 89 mA · h/g, respectively. After the first five continous charge-discharge cycles, the discharge capacities are decreased to 94 mA · h/g and 87 mA · h/g, respectively.更多还原