We study the relationship between Li2O2 morphology and the electrochemical performance of the Li-O2 battery using a combination of experiment and theory. Experimental Li-O2 battery discharge curves are accurately captured by a theoretical model in which electrode performance is limited by the nucleation and growth of discrete Li2O2 nanostructures in the cathode. We further show that the characteristic sharp voltage drop widely reported at the end of discharge results from the decrease in electrochemical surface area as Li2O2 covers the cathode surface. Preventing surface nucleation is highlighted as a core strategy for increasing Li-O2 battery capacity.
|Original language||English (US)|
|Number of pages||8|
|State||Published - 2015|
Bibliographical noteKAUST Repository Item: Exported on 2021-11-03
Acknowledged KAUST grant number(s): KUS-C1-018-02
Acknowledgements: The authors gratefully acknowledge support from the National Science Foundation Partnerships for Innovation Program (Grant No. IIP-1237622) and by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). S.L. acknowledges support from the Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program. This work made use of the Cornell Center for Materials Research Shared Facilities which are supported through the NSF MRSEC program (Grant No. DMR-1120296).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
ASJC Scopus subject areas
- Materials Science(all)
- Mechanical Engineering
- Condensed Matter Physics