Carbon nanotube-supported mixed-valence $\mathrm{Mn}_{3} \mathrm{O}_{4}$ electrodes for high-performance lithium-oxygen batteries
Yuting Zhu , Jing Gao , Zhongxiao Wang , Rui Sun , Longwei Yin , Chengxiang Wang , Zhiwei Zhang
ChemPhysMater ›› 2024, Vol. 3 ›› Issue (1) : 94 -102.
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 Mn3O4 nanoparticles onto multi-walled carbon nanotubes (Mn3O4@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 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.
Mixed-valence states / Carbon nanotube / Electrode reaction kinetics / Lithium-oxygen batteries
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