A simple physical mixing method for MnO2/MnO nanocomposites with superior Zn^2+storage performance  

简单物理混合方法提高MnO2/MnO纳米复合材料的储Zn^2+性能

作　　者：Xiao-bei ZANG Ling-tong LI Zhi-xin SUN Rabah BOUKHERROUB Jia-xin MENG Kun-peng CAI Qing-guo SHAO Ning CAO 臧晓蓓;李灵桐;孙志欣;Rabah BOUKHERROUB;孟佳欣;蔡鲲鹏;邵庆国;曹宁(中国石油大学(华东)材料科学与工程学院,青岛266580;University Lille,CNRS UMR 8520-IEMN,Lille,F-59000,France)

机构地区：[1]School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China [2]University Lille,CNRS UMR 8520-IEMN,Lille,F-59000,France

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第12期3347-3355,共9页中国有色金属学报（英文版）

基　　金：Project(21905304)supported by the National Natural Science Foundation of China;Project(ZR2019BEM031)supported by the Natural Science Foundation of Shandong Province,China;Projects(18CX02158A,19CX05001A)supported by the Fundamental Research Funds for the Central Universities,China。

摘　　要：MnO2/MnO cathode material with superior Zn^2+storage performance is prepared through a simple physical mixing method.The MnO2/MnO nanocomposite with a mixed mass ratio of 12:1 exhibits the highest specific capacity(364.2 mA·h/g at 0.2C),good cycle performance(170.4 mA·h/g after 100 cycles)and excellent rate performance(205.7 mA·h/g at 2C).Analysis of cyclic voltammetry(CV)data at various scan rates shows that both diffusioncontrolled insertion behavior and surface capacitive behavior contribute to the Zn2+storage performance of MnO2/MnO cathodes.And the capacitive behavior contributes more at high discharge rates,due to the short paths of ion diffusion and the rapid transfer of electrons.通过简单的物理混合方法制备具有优异储Zn^2+性能的MnO2/MnO正极材料。混合质量比为12:1的MnO2/MnO纳米复合材料具有最高的比容量(0.2C时达364.2 mA·h/g),良好的循环性能(100次循环后达170.4 mA·h/g)和倍率性能(2C时达205.7 mA·h/g)。通过探究储能机理,充放电过程中扩散控制的插入行为和表面电容行为均有助于MnO2/MnO正极的储Zn^2+性能。由于离子扩散的短路径和电子的快速转移,在高放电倍率下,电容行为发挥更大的作用。

关 键 词：zinc-ion battery MnO2/MnO cathode material physical mixing method reaction kinetics 

分 类 号：TM912[电气工程—电力电子与电力传动] TB33[一般工业技术—材料科学与工程]