We report the chemical intercalation of Li+ into the interlayer of V2O5·nH2O with enlarged layer spacing and fast Zn2+ diffusion, resulting in high rate capability and excellent long-term cycling performance.

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Aqueous Zn–MnO2 batteries have received much attentions for large‐scale applications because of high safety and low cost. However, the energy storage mechanisms of Zn–MnO2 system are still in dispute. Herein, a cathode‐free Zn–MnO2 battery is provided with the coexistence of dual mechanisms in mild acidic environment, in which the decisive guiding effect of the pH value in electrolyte on the mechanism is deeply investigated. On this basis, acetic acid (HAc) is used as a buffering additive to effectively suppress the “fluctuation” phenomenon during the operation, hence achieving the “self‐adjust” mechanism. The assembled soft package battery possesses a long lifetime of 2000 cycles with the Coulombic efficiency of 99.6%, improved high‐loading performance and rate capability. A new idea is provided for the exploration of energy storage mechanism of Zn–MnO2 battery as well as a guidance on the optimization strategies especially the battery construction.

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A eutectic electrolyte strategy is proposed for zinc-iodine battery. Both the reasonable solvated structure and suppressed generation of I3− as an intermediate product achieve the high reversible I−/I0 conversion.