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A rechargeable lithium–oxygen battery with dual mediators stabilizing the carbon cathode

Author

Listed:
  • Xiangwen Gao

    (Parks Road, University of Oxford)

  • Yuhui Chen

    (Parks Road, University of Oxford)

  • Lee R. Johnson

    (Parks Road, University of Oxford)

  • Zarko P. Jovanov

    (Parks Road, University of Oxford)

  • Peter G. Bruce

    (Parks Road, University of Oxford)

Abstract

At the cathode of a Li–O2 battery, O2 is reduced to Li2O2 on discharge, the process being reversed on charge. Li2O2 is an insulating and insoluble solid, leading ultimately to low rates, low capacities and early cell death if formed on the cathode surface. Here we show that when using dual mediators, 2,5-Di-tert-butyl-1,4-benzoquinone [DBBQ] on discharge and 2,2,6,6-tetramethyl-1-piperidinyloxy [TEMPO] on charge, the electrochemistry at the cathode surface is decoupled from Li2O2 formation/decomposition in solution. Capacities of 2 mAh cmareal−2 at 1 mA cmareal−2 with low polarization on charge/discharge are demonstrated, and up to 40 mAh cmareal−2 at rates ≫1 mA cmareal−2 are anticipated if suitable gas diffusion electrodes can be devised. One of the major barriers to the progress of Li–O2 cells is decomposition of the carbon cathode. By forming/decomposing Li2O2 in solution and avoiding high charge potentials, the carbon instability is significantly mitigated (

Suggested Citation

  • Xiangwen Gao & Yuhui Chen & Lee R. Johnson & Zarko P. Jovanov & Peter G. Bruce, 2017. "A rechargeable lithium–oxygen battery with dual mediators stabilizing the carbon cathode," Nature Energy, Nature, vol. 2(9), pages 1-7, September.
    • Handle: RePEc:nat:natene:v:2:y:2017:i:9:d:10.1038_nenergy.2017.118
    DOI: 10.1038/nenergy.2017.118
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