Controlled Synthesis of Core-shell Structured Mn3O4@ZnO Nanosheet Arrays for Aqueous Zinc-ion Batteries
(2.China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan , China 430074)
【Abstract】Manganese-based oxides are promising cathode materials for zinc-ion batteries. However, these materials often suffer from rapid capacity fade due to structure collapse during charge–discharge processes. Here, we report that the core-shell structured Mn3O4@ZnO nanosheet arrays were synthesized on the carbon cloth, combining microwave–hydrothermal process with atomic layer deposition. With an optimized thickness of ZnO coating layer, the capacity retention of the as-formed Mn3O4@ZnO nanosheet arrays exhibits 60.3% over 100 discharge–charge cycles at a current density of 100 mA·g−1. It is demonstrated that the introduction of ZnO layers is beneficial to maintaining the microstructure and improving the structural stability of the Mn3O4 electrode material during the charge–discharge process, benefiting from avoiding direct contact with the electrolyte. The design of the well-defined core-shell structure provides an effective way to develop high-performance manganese-based oxide cathode materials for zinc-ion batteries.
【Keywords】 core-shell structure; manganese-based oxide; atomic layer deposition; microwave–hydrothermal process; aqueous zinc-ion battery;
(Translated by WANG YX)
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