Journal Article

FZJ-2018-06711

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Cation-Dependent Electrochemistry of Polysulfides in Lithium and Magnesium Electrolyte Solutions

Bieker, G. ; Diddens, D.FZJ* ; Kolek, M. (Corresponding author) ; Borodin, O. ; Winter, M.FZJ* ; Bieker, P. (Corresponding author) ; Jalkanen, K.

2018
Soc.66306 Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/23485  doi:10.1021/acs.jpcc.8b06560

Abstract: In Li/S and Mg/S batteries, the charge and discharge of the sulfur cathode proceeds through a cascade of bivalent Sx2– and radical Sy•– polysulfide intermediates. The presence of Li+ or Mg2+ cations in the electrolyte determines the type of intermediates and the overpotentials of their formation in a different manner. Based on systematic cyclic voltammetry (CV) and UV/vis investigations, this work reveals how the mutual interplay of the different cations, the electrolyte solvent, and the polysulfide anions is reflected in the electrochemical behavior of “Li2S8”/LiTFSI and “MgS8”/MgTFSI2 solutions with dimethyl sulfoxide, dimethylformamide, acetonitrile, dimethoxyethane, tetraethylene glycol dimethyl ether, or tetrahydrofuran as solvent. It was observed that the disproportionation reactions of the polysulfides are generally more pronounced and especially the S3•– radical is less stabilized in Mg2+ than in Li+ containing solutions. In contrast to their Li counterparts, the formation of S42– polysulfides during the reduction of sulfur is not observed in glyme-based Mg polysulfide solutions. Quantum chemical predictions of stability and disproportionation of the Mg/polysulfide/solvent clusters complemented the CV and UV/vis investigations.

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Contributing Institute(s):

1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)

Research Program(s):

1. 131 - Electrochemical Storage (POF3-131) (POF3-131)

Appears in the scientific report 2019

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Free to read ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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