Mechanistic Role of Li+ Dissociation Level in Aprotic Li-O-2 Battery

Title
Mechanistic Role of Li+ Dissociation Level in Aprotic Li-O-2 Battery
Author
선양국
Keywords
Li-O-2 batteries; lithium salts; EQCM; glyme solvents; ionic association
Issue Date
2016-03
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v. 8, NO 8, Page. 5300-5307
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.
URI
http://pubs.acs.org/doi/10.1021/acsami.5b11483http://hdl.handle.net/20.500.11754/36986
ISSN
1944-8244
DOI
10.1021/acsami.5b11483
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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