A high-rate and long-life organic–oxygen battery
Abstract
Alkali metal–oxygen batteries promise high gravimetric energy densities but suffer from low rate capability, poor cycle life and safety hazards associated with metal anodes.
Here we describe a safe, high-rate and long-life oxygen battery that exploits a potassium biphenyl complex anode and a dimethylsulfoxide-mediated potassium superoxide cathode.
The proposed potassium biphenyl complex–oxygen battery exhibits an unprecedented cycle life (3,000 cycles) with a superior average coulombic efficiency of more than 99.84% at a high current density of 4.0 mA cm−2. We further reduce the redox potential of biphenyl by adding the electron-donating methyl group to the benzene ring, which successfully achieved a redox potential of 0.14 V versus K/K+. This demonstrates the direction and opportunities to further improve the cell voltage and energy density of the alkali-metal organic–oxygen batteries.
Data availability
Data supporting the findings of this study are available from the corresponding author upon reasonable request.
Additional information
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Source: nature
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