Abstract
On discharge, the Li–O2 battery can form a Li2O2 film on the cathode surface, leading to low capacities, low rates and early cell death, or it can form Li2O2 particles in solution, leading to high capacities at relatively high rates and avoiding early cell death. Achieving discharge in solution is important and may be encouraged by the use of high donor or acceptor number solvents or salts that dissolve the LiO2 intermediate involved in the formation of Li2O2. However, the characteristics that make high donor or acceptor number solvents good (for example, high polarity) result in them being unstable towards LiO2 or Li2O2. Here we demonstrate that introduction of the additive 2,5-di-tert-butyl-1,4-benzoquinone (DBBQ) promotes solution phase formation of Li2O2 in low-polarity and weakly solvating electrolyte solutions. Importantly, it does so while simultaneously suppressing direct reduction to Li2O2 on the cathode surface, which would otherwise lead to Li2O2 film growth and premature cell death. It also halves the overpotential during discharge, increases the capacity 80- to 100-fold and enables rates >1 mA cmareal−2 for cathodes with capacities of >4 mAh cmareal−2. The DBBQ additive operates by a new mechanism that avoids the reactive LiO2 intermediate in solution.
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Change history
16 June 2016
In the version of the Article originally published, the first author's name in ref. 43 should have read 'Giordani, V.'. This has been corrected in all versions of the Article.
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Acknowledgements
P.G.B. is indebted to the EPSRC and the RCUK Energy programme including SUPERGEN for financial support.
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X.G. and Y.C. designed experiments and analysed the data. X.G. performed electrochemical and characterization of discharge products. Y.C. performed the ultraviolet–visible spectroscopy experiments and analysed the data. P.G.B., X.G., Y.C. and L.J. interpreted the data. P.G.B. wrote the paper.
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Gao, X., Chen, Y., Johnson, L. et al. Promoting solution phase discharge in Li–O2 batteries containing weakly solvating electrolyte solutions. Nature Mater 15, 882–888 (2016). https://doi.org/10.1038/nmat4629
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DOI: https://doi.org/10.1038/nmat4629
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