Journal Article · · Advanced Science
DOI: https://doi.org/10.1002/advs.202203443 · OSTI ID:2470265
Park, Kyobin[1]; Kim, Dong‐Min[2]; Ha, Kwang‐Ho[1]; Kwon, Bomee[1]; Lee, Jeonghyeop[1]; Jo, Seunghyeon[1]; Ji, Xiulei[3]; Lee, Kyu Tae [1]
- School of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak‐ro, Gwanak‐gu Seoul 08826 Republic of Korea
- The Molecular Foundry and the Joint Center for Energy Storage Research Department Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- Department of Chemistry Oregon State University Corvallis OR 97331‐4003 USA
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Abstract The activity of lithium ions in electrolytes depends on their solvation structures. However, the understanding of changes in Li+activity is still elusive in terms of interactions between lithium ions and solvent molecules. Herein, the chelating effect of lithium ion by forming [Li(15C5)]+gives rise to a decrease in Li+activity, leading to the negative potential shift of Li metal anode. Moreover, weakly solvating lithium ions in ionic liquids, such as [Li(TFSI)2]−(TFSI = bis(trifluoromethanesulfonyl)imide),increase in Li+activity, resulting in the positive potential shift of LiFePO4cathode. This allows the development of innovative high energy density Li metal batteries, such as 3.8V class Li | LiFePO4cells, along with introducing stable biphasic electrolytes. In addition, correlation between Li+activity, cell potential shift, and Li+solvation structure is investigated by comparing solvated Li+ions with carbonate solvents, chelated Li+ions with cyclic and linear ethers, and weakly solvating Li+ions in ionic liquids. These findings elucidate a broader understanding of the complex origin of Li+activity and provide an opportunity to achieve high energy density lithium metal batteries.
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- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Joint Center for Energy Storage Research (JCESR)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 2470265
- Journal Information:
- Advanced Science, Vol. 9, Issue 33; ISSN 2198-3844
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
References (46)
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