Salt Bridge-intermediated Three Phase Decoupling Electrolytes for High Voltage Electrolytic Aqueous Zinc-Manganese Dioxides Battery

•A salt-bridge-intermediated three phase electrolytes design for electrolysis Zn-MnO2 battery.•A high discharge voltage of 2.5 V is achieved with specific capacity of 604 mAh g-1.•A wide electrochemical stability window of 3.58 V is obtained. The electrolytic Zn-MnO2 aqueous battery is an attractive energy storage technology with a high working voltage and energy density for the large-scale application. Here, a three-phase decoupled Zn-MnO2 electrolytic battery is designed. A salt bridge gel as an intermediate is introduced to separate the catholyte and anolyte in this design. This battery behaves a wide electrochemical stability window and a high discharge voltage of 2.5 V with 95 % capacity retention after 350 cycles. The working mechanism has also been discussed in this study via ex-situ analysis.