Journalartikel

Jahr der Veröffentlichung: 2017

Seiten: 3822-3829

Zeitschrift: Journal of Physical Chemistry C

Bandnummer: 121

Heftnummer: 7

ISSN: 1932-7447

eISSN: 1932-7455

Open Access Status: Green

DOI Link: https://doi.org/10.1021/acs.jpcc.7b00355

Verlag: American Chemical Society

Abstract: 
The 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 nonaqueous 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.

Harvard-Zitierstil: Landa-Medrano, I., Olivares-Marin, M., Bergner, B., Pinedo, R., Sorrentino, A., Pereiro, E., et al. (2017) Potassium Salts as Electrolyte Additives in Lithium-Oxygen Batteries, Journal of Physical Chemistry C, 121(7), pp. 3822-3829. https://doi.org/10.1021/acs.jpcc.7b00355

APA-Zitierstil: Landa-Medrano, I., Olivares-Marin, M., Bergner, B., Pinedo, R., Sorrentino, A., Pereiro, E., de Larramendi, I., Janek, J., Rojo, T., & Tonti, D. (2017). Potassium Salts as Electrolyte Additives in Lithium-Oxygen Batteries. Journal of Physical Chemistry C. 121(7), 3822-3829. https://doi.org/10.1021/acs.jpcc.7b00355