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Potassium Salts as Electrolyte Additives in Lithium-Oxygen Batteries

AuthorsLanda, Imanol; Olivares, Mara ; Bergner, Benjamin; Pinedo, Ricardo; Sorrentino, Andrea; Pereiro, Eva; Ruiz de Larramendi, Idoia; Janek, Jürgen; Rojo, Teófilo; Tonti, Dino
Issue Date30-Jan-2017
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry C: 10.1021/acs.jpcc.7b00355 (2017)
AbstractThe stabilization of the intermediates formed during oxygen reduction reaction and their efficient solubilization and diffusion is a crucial issue that needs to be improved in non-aqueous lithium oxygen batteries. By adding 0.1 M K+ (as KOTf salt) to the electrolyte we have observed remarkable improvements in the rate capability of the discharge process. The K+ cation facilitates a more homogeneous discharge product deposition in the porous cathode. Instead, as evidenced by synchrotron measurements, we find that K+ does not influence the cell chemistry, suggesting that it rather assists the superoxide solvation, thus enhancing the solution-based growth of the discharge products. In addition, if iodide (I-) is added as redox mediator we find an extended cycle life when K+ instead of Li+ is used as cation. This finding remarks the benefits of stabilizing the oxygen reduction products in the electrolyte leading to a solution-based mechanism.
Publisher version (URL)http://dx.doi.org/10.1021/acs.jpcc.7b00355
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