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Importance of Reaction Kinetics and Oxygen Crossover in aprotic Li–O 2 Batteries Based on a Dimethyl Sulfoxide Electrolyte
Author(s) -
Marinaro M.,
Balasubramanian P.,
Gucciardi E.,
Theil S.,
Jörissen L.,
WohlfahrtMehrens M.
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201500600
Subject(s) - electrolyte , electrochemistry , dimethyl sulfoxide , battery (electricity) , chemistry , cathode , lithium (medication) , inorganic chemistry , reactivity (psychology) , electrochemical kinetics , electrochemical window , electrode , chemical engineering , organic chemistry , ionic conductivity , medicine , power (physics) , physics , alternative medicine , quantum mechanics , pathology , engineering , endocrinology
Although still in their embryonic state, aprotic rechargeable Li‐O 2 batteries have, theoretically, the capabilities of reaching higher specific energy densities than Li‐ion batteries. There are, however, significant drawbacks that must be addressed to allow stable electrochemical performance; these will ultimately be solved by a deeper understanding of the chemical and electrochemical processes occurring during battery operations. We report a study on the electrochemical and chemical stability of Li–O 2 batteries comprising Au‐coated carbon cathodes, a dimethyl sulfoxide (DMSO)‐based electrolyte and Li metal negative electrodes. The use of the aforementioned Au‐coated cathodes in combination with a 1 M lithium bis(trifluoromethane)sulfonimide (LiTFSI)–DMSO electrolyte guarantees very good cycling stability (>300 cycles) by minimizing eventual side reactions. The main drawbacks arise from the high reactivity of the Li metal electrode when in contact with the O 2 ‐saturated DMSO‐based electrolyte.