Enhancing electrochemical intermediate solvation through electrolyte anion selection to increase nonaqueous Li–O 2 battery capacity
[1];
[2];
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720,, Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720,
- Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213,
- Institute for Combustion Technology, Rheinisch-Westfälische Technische Hochschule Aachen, 52056 Aachen, Germany
Significance The Li–air battery has attracted significant interest as a potential high-energy alternative to Li-ion batteries. However, the battery discharge product, lithium peroxide, is both electronically insulative and insoluble in nonaqueous electrolytes. It therefore passivates the battery cathode as it is uniformly deposited and disallows the battery to achieve even a modest fraction of its potential electrochemical capacity. Our objective is to circumvent this challenge by enhancing the solubility of electrochemically formed intermediate species. We present a rational basis for electrolyte (i.e., solvent and salt) selection for nonaqueous Li–air batteries and demonstrate a selection criterion for an electrolyte salt that increases the stability of Li + in solution, thereby triggering a solution-based process that allows significantly improved battery capacities.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-05CH11231; FOA-0000991
- OSTI ID:
- 1235121
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 112 Journal Issue: 30; ISSN 0027-8424
- Publisher:
- Proceedings of the National Academy of SciencesCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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