Stable lithium-ion batteries based on a hybrid aqueous/organic electrolyte
Journal article, 2024
Moving from organic to aqueous lithium-ion batteries (ALIBs) would be an interesting feat. As of today, we have water-in-salt electrolytes (WISEs) that were developed primarily to expand the electrochemical stability window of traditional aqueous electrolytes. However, their cathodic limits do not enable the use of high-capacity negative electrodes and the very high concentrations of expensive heavily fluorinated salts, often >20 mol kg−1, hinder any feasible implementation of LIBs based on WISEs. A hybrid organic/aqueous electrolyte based on LiFTFSI dissolved in sulfolane and water is here presented as an alternative, where sulfolane is used to tune and reduce the water activity, by altering the Li+ cation first solvation shell, and thereby the cathodic limit can be pushed to <1.0 V vs. Li+/Li even at a comparatively moderate salt concentration (7.8 mol kg−1). This enables long-term operation of an Li4Ti5O12⎪hybrid electrolyte⎪LiMn2O4 2.4 V cell with a specific energy of 156 Wh kgAM−1.
Hybrid electrolytes
Solvation structure
Sulfolane
Water in salt
LiFTFSI
Author
Shahid Khalid
University of Milano-Bicocca
Ivan Claudio Pellini
University of Milano-Bicocca
Nicolò Pianta
University of Milano-Bicocca
Roberto Lorenzi
University of Milano-Bicocca
Silvia Leonardi
Eni S.p.A. energy company
Laura Meda
Eni S.p.A. energy company
Caterina Rizzo
Eni S.p.A. energy company
Ernesto Roccaro
Eni S.p.A. energy company
Patrik Johansson
Alistore - European Research Institute
Chalmers, Physics, Materials Physics
Piercarlo Mustarelli
National Interuniversity Consortium of Materials Science and Technology (INSTM)
University of Milano-Bicocca
Riccardo Ruffo
National Interuniversity Consortium of Materials Science and Technology (INSTM)
University of Milano-Bicocca
Journal of Power Sources
0378-7753 (ISSN)
Vol. 612 234803Subject Categories (SSIF 2011)
Materials Chemistry
Computer Science
DOI
10.1016/j.jpowsour.2024.234803