Rechargeable aqueous zinc-manganese batteries have been receiving inclusive attention due to their high energy density, low cost and environmental friendliness. However, the development of manganese dioxide as the cathode for aqueous Zn-ion batteries (ZIBs) is restricted by the speedy capacity attenuation and low rate performance. Herein, a new cathode material alpha-MnO2@In2O3 is proposed. After a uniform coating of In2O3 on the alpha-MnO2 nanotubes, the cycling stability and rate performance have all got great improvement due to the enhancement of the electrical conductivity according to the electrochemical kinetical investigation result. alpha-MnO2@In2O3 exhibits a high capacity of 425 mA h g(-1) after 100 cycles at 100 mA g(-1), and it can still maintain 115 mA h g(-1) at a high current density of 2000 mA g(-1) after a long-term cycling of 1300 cycles. Besides, a specific capacity of 75 mA h g(-1) is attained at 3000 mA g(-1) for 3000 cycles without significant decay. The overall electrochemical performance are superior to most other reported cathode materials so far. This study brings a new coating strategy of using In2O3 to the improvement of the intrinsic poor conductivity of cathode materials other than carbon coating. (C) 2019 The Electrochemical Society.