A high-rate and long-life organic–oxygen battery

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 dimethy...

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Bibliographic Details
Published in:Nature materials 2019-04, Vol.18 (4), p.390-396
Main Authors: Cong, Guangtao, Wang, Wanwan, Lai, Nien-Chu, Liang, Zhuojian, Lu, Yi-Chun
Format: Article
Language:English
Subjects:
119/118
639/301/299/891
639/638/161
Alkali metals
Anodes
Battery cycles
Benzene
Biomaterials
Chemistry and Materials Science
Condensed Matter Physics
Electrode potentials
Flux density
Gravimetry
Hazards
Materials Science
Metal air batteries
Nanotechnology
Optical and Electronic Materials
Oxygen
Potassium
Redox potential
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Summary: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. Alkali metal–oxygen batteries promise high energy densities but suffer from low rate capability and cycling due to metal anodes. A high-rate and long-life oxygen battery with a potassium biphenyl complex anode and a dimethylsulfoxide-mediated potassium superoxide cathode is reported.
ISSN:1476-1122
1476-4660
DOI:10.1038/s41563-019-0286-7