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Inverting the Triiodide Formation Reaction by the Synergy between Strong Electrolyte Solvation and Cathode Adsorption for Lithium–Oxygen Batteries
Author(s) -
Zhang XiaoPing,
Li YanNi,
Sun YiYang,
Zhang Tao
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201910427
Subject(s) - solvation , chemistry , triiodide , electrolyte , oxygen , redox , adsorption , lithium (medication) , cathode , molecule , dimethyl sulfoxide , raman spectroscopy , solvation shell , inorganic chemistry , electrode , organic chemistry , physics , optics , medicine , dye sensitized solar cell , endocrinology
An exceptionally strong solvation effect of dimethyl sulfoxide (DMSO) on I 2 is identified by the largest shift observed so far of the I 2 Raman peak with respect to I 2 vapor and by elongated I−I bond lengths in first‐principles molecular‐dynamics simulations. This effect together with strong binding by an RuO 2 surface to I 2 is found to invert the direction of the reaction I − +I 2 ⇌I 3 − to the left‐hand side. Inspired by this finding, we prepared a Li–O 2 battery with the Li/DMSO+LiI/RuO 2 structure. The synergic action of DMSO and RuO 2 on I 2 is found to suppress the shuttle effect of the redox mediator (RM) by anchoring I 2 molecules, the oxidation product of the RM. Significantly enhanced stability is demonstrated over 100 cycles at charging voltage below 3.65 V.