<p>The construction of high-performance manganese-based cathode materials with good charge and discharge stability is the key to the development of aqueous zinc-ion batteries. In this study, a Mn₂O₃@PPy composite cathode was successfully synthesized by integrating porous Mn₂O₃ spheres with a conductive polypyrrole (PPy) coating. The electrochemical performance and Zn²⁺ storage mechanism of the composite were systematically investigated. The PPy layer, as a conductive and protective layer, can enhance electrical conductivity, reduce interfacial charge transfer resistance, and prevent immediate contact between Mn₂O₃ and the electrolyte. This effectually suppresses the Mn³⁺ disproportionation reaction, thereby enhancing structural stability and extending the cycling lifespan of the electrode. It can be concluded that the Mn₂O₃@PPy cathode achieves an initial discharge capacity as high as 456.5 mAh g⁻¹ at 0.1 A g⁻¹. Notably, even after 1000 cycles at 1.0 A g⁻¹, it retains a capacity of 101.5 mAh g⁻¹, demonstrating excellent cycling stability and durability.</p>