Aqueous battery systems feature high safety, but they usually suffer from low voltage and low energy density, restricting their applications in large-scale storage. Here, we propose an electrolyte-decoupling strategy to maximize the full potential of Zn–MnO₂ batteries by simultaneously enabling the optimal redox chemistry of both the Zn and MnO₂ electrodes. The decoupled Zn–MnO₂ battery exhibits an open-circuit voltage of 2.83 V (in contrast to the typical voltage of 1.5 V in conventional Zn–MnO₂ batteries), as well as cyclability with only 2% capacity fading after deep cycling for 200 h. Benefiting from the full utilization of MnO₂, the Zn–MnO₂ battery is also able to maintain approximately 100% of its capacity at various discharge current densities. We also demonstrate the feasibility of integrating the Zn–MnO₂ battery with a wind and photovoltaic hybrid power generating system. This electrolyte-decoupling strategy is shown to be applicable for other high-performance zinc-based aqueous batteries such as Zn–Cu and Zn–Ag batteries.

水电池系统具有高安全性，但是它们通常遭受低电压和低能量密度的困扰，从而限制了其在大规模存储中的应用。在这里，我们提出了一种电解质去耦策略，通过同时启用Zn和MnO ₂电极的最佳氧化还原化学作用来最大化Zn-MnO ₂电池的全部电势。解耦后的Zn-MnO ₂电池的开路电压为2.83 V（与常规Zn-MnO ₂电池的典型电压为1.5 V相比），并且在200次深度循环后容量仅有2％的褪色而具有可循环性H。受益于MnO ₂的充分利用，Zn–MnO ₂电池还能够在各种放电电流密度下保持大约100％的容量。我们还演示了将Zn-MnO ₂电池与风力和光伏混合发电系统集成的可行性。事实证明，这种电解质去耦策略适用于其他高性能锌基水性电池，例如Zn-Cu和Zn-Ag电池。