摘要
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。
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.
作者
臧晓蓓
李灵桐
孙志欣
Rabah BOUKHERROUB
孟佳欣
蔡鲲鹏
邵庆国
曹宁
Xiao-bei ZANG;Ling-tong LI;Zhi-xin SUN;Rabah BOUKHERROUB;Jia-xin MENG;Kun-peng CAI;Qing-guo SHAO;Ning CAO(School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China;University Lille,CNRS UMR 8520-IEMN,Lille,F-59000,France)
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。