Mechanistic Role of Li+ Dissociation Level in Aprotic Li-O2 Battery

Daniel Sharon, Daniel Hirsberg, Michael Salama, Michal Afri, Aryeh A. Frimer, Malachi Noked, Wonjin Kwak, Yang Kook Sun, Doron Aurbach*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

113 Scopus citations

Abstract

The kinetics and thermodynamics of oxygen reduction reactions (ORR) in aprotic Li electrolyte were shown to be highly dependent on the surrounding chemical environment and electrochemical conditions. Numerous reports have demonstrated the importance of high donor number (DN) solvents for enhanced ORR, and attributed this phenomenon to the stabilizing interactions between the reduced oxygen species and the solvent molecules. We focus herein on the often overlooked effect of the Li salt used in the electrolyte solution. We show that the level of dissociation of the salt used plays a significant role in the ORR, even as important as the effect of the solvent DN. We clearly show that the salt used dictates the kinetics and thermodynamic of the ORR, and also enables control of the reduced Li2O2 morphology. By optimizing the salt composition, we have managed to demonstrate a superior ORR behavior in diglyme solutions, even when compared to the high DN DMSO solutions. Our work paves the way for optimization of various solvents with reasonable anodic and cathodic stabilities, which have so far been overlooked due to their relatively low DN.

Original languageAmerican English
Pages (from-to)5300-5307
Number of pages8
JournalACS applied materials & interfaces
Volume8
Issue number8
DOIs
StatePublished - 2 Mar 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

Keywords

  • EQCM
  • Li-O batteries
  • glyme solvents
  • ionic association
  • lithium salts

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