Promoting Proton Migration Kinetics by Ni ²⁺ Regulating Enables Improved Aqueous Zn‐MnO ₂ Batteries

The energy storage behaviors of MnO 2 for aqueous Zn-MnO 2 batteries mainly depend on the Zn 2+ /H + intercalation but are limited by poor ion/electron migration dynamics and stability. Herein, a strategy is proposed that promoting proton migration kinetics ameliorates H + storage activity by introducing Ni 2+ into γ-MnO 2 （Ni-MnO 2 ）. Ni 2+ can lower the diffusion barrier of H + and selectively induce the ion intercalation, thereby alleviating the electrostatic interaction with the lattice. Moreover, Ni 2+ enables the adjacent [MnO 6 ] octahedrons to have better electron conductivity. The NiMnO 2 exhibits superior rate performance（nearly four times specific capacity compared with MnO 2 ） and ultra-long-cycle stability(100% of capacity retention after 11 000 cycles at 3.0 A g -1 ). The calculation indicates that the Ni-MnO 2 allows H + migrate rapidly along the one-dimensional tunnel due to reduction of the activation energy caused by Ni 2+ regulating, thus achieving excellent reaction kinetics. This work brings great potential for the development of high-performance aqueous Zn-MnO 2 batteries.