Carbon nanotube-supported mixed-valence Mn_(3)O_(4) electrodes for high-performance lithium-oxygen batteries  

作　　者：Yuting Zhu Jing Gao Zhongxiao Wang Rui Sun Longwei Yin Chengxiang Wang Zhiwei Zhang 

机构地区：[1]Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials,Ministry of Education,School of Materials Science and Engineering,Shandong University,Jinan 250061,China

出　　处：《ChemPhysMater》2024年第1期94-102,共9页化学物理材料（英文）

基　　金：the Nature Science Foun-dation of Shandong Province(Grant No:ZR2019BEM019);Future Plans of Young Scholars at Shandong University.

摘　　要：Lithium-oxygen batteries(LOBs)have extensive applications because of their ultra-high energy densities.However,the practical application of LOBs is limited by several factors,such as a high overpotential,poor cycle stability,and limited rate capacity.In this paper,we describe the successful uniform loading of Mn_(3)O_(4) nanoparticles onto multi-walled carbon nanotubes(Mn_(3)O_(4)@CNT).CNTs form a conductive network and expose numerous catalytically active sites,and the one-dimensional porous structure provides a convenient channel for the transmission of Li+and O2 in LOBs.The electronic conductivity and electrocatalytic activity of Mn_(3)O_(4)@CNT are significantly better than those of MnO@CNT because of the inherent driving force facilitating charge transfer between different valence metal ions.Therefore,the Mn_(3)O_(4)@CNT cathode obtains a low overpotential(0.76 V at a limited capacity of 1000 mAh g^(-1)),high initial discharge capacity(16895 mAh g^(-1) at 200 mA g^(-1)),and long cycle life(97 cycles at 200 mA g^(-1)).This study provides evidence that transition metal oxides with mixed-valence states are suitable for application as efficient cathodes for LOBs.

关 键 词：Mixed-valence states Carbon nanotube Electrode reaction kinetics Lithium–oxygen batteries 

分 类 号：TM911[电气工程—电力电子与电力传动] TB383[一般工业技术—材料科学与工程]