MnO 2 is regarded as a promising cathode for aqueous rechargeable zinc-ion batteries (ARZBs) due to its high theoretical capacity and high voltage. However, it still faces unsatisfied long-term cycling durability due to the John−Teller effect and the formation of the irreversible phase during cycling. Herein, this issue is addressed by constructing a hybrid cathode with a facile commercial strategy involving a uniform mixture of Bi 2 O 3 and MnO 2 nanotubes. The multiple effects of adding Bi 2 O 3 are deeply revealed by means of the electrochemical kinetics test, charge− discharge mechanism investigation, phase and structural evolution analyses, as well as density functional theory (DFT) calculations. It is found that the in situ-formed Bi 3+ can not only enhance the structural stability and alleviate the dissolution of Mn 3+ by forming Mn−O bonds with MnO 2 , but also lead to better transport kinetics of Zn 2+ by the competitive formation of Bi 2 Mn 4 O 10 that can inhibit the irreversible ZnMn 2 O 4 produced during the repeated H + and Zn 2+ coinsertion/extraction process. Moreover, the tunnel-like Bi 2 Mn 4 O 10 can contribute an additional capacity by the insertion of H + . Benefiting from these, the MnO 2 /Bi 2 O 3 hybrid cathode delivers high capacities of 120 and 80 mAh g −1 even after 5000 cycles at the current densities of 3000 and 10 000 mA g −1 , respectively. This design provides an effective and scalable pathway to enhance the electrochemical performance of the MnO 2 cathode and may speed up the commercial application of ARZBs.

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