Promoting Proton Migration Kinetics by Ni2+ Regulating Enables Improved Aqueous Zn‐MnO2 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 Ni‐MnO 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.