首页|Carbon nanotube-supported mixed-valence Mn3O4 electrodes for high-performance lithium-oxygen batteries
Carbon nanotube-supported mixed-valence Mn3O4 electrodes for high-performance lithium-oxygen batteries
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Lithium-oxygen batteries(LOBs)have extensive applications because of their ultra-high energy densities.How-ever,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 Mn3O4 nanopar-ticles onto multi-walled carbon nanotubes(Mn3O4@CNT).CNTs form a conductive network and expose numer-ous 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 Mn3O4@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 Mn3O4@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.
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
Nature Science Foundation of Shandong ProvinceFuture Plans of Young Scholars at Shandong University
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