Kim, Hyea Wu, Feixiang Lee, Jung Tae Nitta, Naoki Lin, Huan-Ting Oschatz, Martin Cho, Won Il Kaskel, Stefan Borodin, Oleg Yushin, Gleb 2024-01-20T07:32:06Z 2024-01-20T07:32:06Z 2021-09-05 2015-03-18 1614-6832 https://pubs.kist.re.kr/handle/201004/125656 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 degrees 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. English WILEY-V C H VERLAG GMBH CARBON PERFORMANCE CELLS SALT TEMPERATURE PARTICLES STABILITY CAPACITY LIQUID In Situ Formation of Protective Coatings on Sulfur Cathodes in Lithium Batteries with LiFSI-Based Organic Electrolytes Article 10.1002/aenm.201401792 1 ADVANCED ENERGY MATERIALS, v.5, no.6 ADVANCED ENERGY MATERIALS 5 6 scie scopus 000351613200016 2-s2.0-84925654887 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Energy & Fuels Materials Science Physics Article CARBON PERFORMANCE CELLS SALT TEMPERATURE PARTICLES STABILITY CAPACITY LIQUID dissolution cathodes batteries electrolytes protective coatings