High?Voltage Aqueous Zinc Batteries Achieved by Tri?functional Metallic Bipolar Electrodes

Aqueous rechargeable zinc batteries are very attractive for energy storage applications due to their low cost and high safety. However, operating voltages limit further development. For the first time, this work proposes a unique approach increase of aqueous by using tri-functional metallic bipolar electrode with good electrochemical activity ultrahigh electronic conductivity, which not only participates in redox reactions, but also functions as an electrical highway charge transport. Furthermore, can replace expensive ion selective membrane separate electrolytes different pH; thus, couples higher potential acid condition Zn / ( OH ) 4 2 - couple lower alkaline be employed together, leading batteries. Herein, two types electrodes Cu Ag utilized based on three kinds batteries: Zn–MnO2, Zn–I2, Zn–Br2. The voltage Zn–MnO2 battery is raised 1.84 V employing one electrode, shows no capacity attenuation after 3500 cycles. Moreover, other adopted successfully construct Zn–I2 Zn–Br2 exhibiting much 2.44 2.67 V, show obvious degradation 1000 800 cycles, representing decent cycle stability. Since applied large family batteries, offers elaborate high-voltage concept model system open door explore