In situ formation of protective coatings on sulfur cathodes in lithium batteries with lifsi-based organic electrolytes
Kim H, Wu F, Lee JT, Nitta N, Lin HT, Oschatz M, Cho WI, Kaskel S, Borodin O, Yushin G (2015)
Publication Type: Journal article
Publication year: 2015
Journal
Book Volume: 5
Article Number: 1401792
Journal Issue: 6
Abstract
Development of sulfur cathodes with 100% coulombic efficiency (CE) and good cycle stability remains challenging due to the polysulfide dissolution in electrolytes. Here, it is demonstrated that electrochemical reduction of lithium bis(fluorosulfonyl)imide (LiFSI) based electrolytes at a potential close to the sulfur cathode operation forms in situ protective coating on both cathode and anode surfaces. Quantum chemistry studies suggest the coating formation is initiated by the FSI(-F) anion radicals generated during electrolyte reduction. Such a reduction additionally results in the formation of LiF. Accelerated cycle stability tests at 60 °C in a very simple electrolyte (LiFSI in dimethoxyethane with no additives) show an average CE approaching 100.0% over 1000 cycles with a capacity decay less than 0.013% per cycle after stabilization. Such a remarkable performance suggests a great promise of both an in situ formation of protective solid electrolyte coatings to avoid unwanted side reactions and the use of a LiFSI salt for this purpose.
Involved external institutions
Georgia Institute of Technology
United States (USA) (US)
Technische Universität Dresden
Germany (DE)
Korea Institute of Science and Technology (KIST) / 한국과학기술연구원
Korea, Republic of (KR)
United States Army Research Laboratory (ARL)
United States (USA) (US)
United States (USA) (US)
Technische Universität Dresden
Germany (DE)
Korea Institute of Science and Technology (KIST) / 한국과학기술연구원
Korea, Republic of (KR)
United States Army Research Laboratory (ARL)
United States (USA) (US)
How to cite
APA:
Kim, H., Wu, F., Lee, J.T., Nitta, N., Lin, H.-T., Oschatz, M.,... Yushin, G. (2015). In situ formation of protective coatings on sulfur cathodes in lithium batteries with lifsi-based organic electrolytes. Advanced Energy Materials, 5(6). https://doi.org/10.1002/aenm.201401792
MLA:
Kim, Hyea, et al. "In situ formation of protective coatings on sulfur cathodes in lithium batteries with lifsi-based organic electrolytes." Advanced Energy Materials 5.6 (2015).
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