Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 51, Pages 22978-22982Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202010745
Keywords
cation additive; LiOH; lithium air batteries; lithium hydroxide; lithium-oxygen batteries
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Funding
- U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office
- DOE Office of Science [DE-AC02-06CH11357]
- US Department of Energy, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- National Science Foundation [CBET-1805938]
- Argonne National Laboratory-University of Illinois at Chicago [4J-30361]
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Lithium-oxygen (Li-O-2) batteries have attracted extensive research interest due to their high energy density. Other than Li2O2 (a typical discharge product in Li-O-2 batteries), LiOH has proved to be electrochemically active as an alternative product. Here we report a simple strategy to achieve a reversible LiOH-based Li-O-2 battery by using a cation additive, sodium ions, to the lithium electrolyte. Without redox mediators in the cell, LiOH is detected as the sole discharge product and it charges at a low charge potential of 3.4 V. A solution-based reaction route is proposed, showing that the competing solvation environment of the catalyst and Li+ leads to LiOH precipitation at the cathode. It is critical to tune the cell chemistry of Li-O-2 batteries by designing a simple system to promote LiOH formation/decomposition.
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