A rechargeable lithium–oxygen battery with dual mediators stabilizing the carbon cathode
Xiangwen Gao,
Yuhui Chen,
Lee R. Johnson,
Zarko P. Jovanov and
Peter G. Bruce ()
Additional contact information
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
Nature Energy, 2017, vol. 2, issue 9, 1-7
Abstract:
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 (
Date: 2017
References: Add references at CitEc
Citations: View citations in EconPapers (1)
Downloads: (external link)
https://www.nature.com/articles/nenergy2017118 Abstract (text/html)
Access to the full text of the articles in this series is restricted.
Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.
Export reference: BibTeX
RIS (EndNote, ProCite, RefMan)
HTML/Text
Persistent link: https://EconPapers.repec.org/RePEc:nat:natene:v:2:y:2017:i:9:d:10.1038_nenergy.2017.118
Ordering information: This journal article can be ordered from
https://www.nature.com/nenergy/
DOI: 10.1038/nenergy.2017.118
Access Statistics for this article
Nature Energy is currently edited by Fouad Khan
More articles in Nature Energy from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().