Polysulfides in dimethylformamide: Only the radical anions S3− and S4− are reducible

Gaillard, F.; Levillain, Eric; Lelieur, J. P.

doi:10.1016/s0022-0728(97)00192-7

Cited by 50 publications

(57 citation statements)

References 16 publications

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“…The CV curve of cathode A shows a complex situation that both cathodic and anodic peaks can be divided into three parts. These peaks are associated with three redox couples, from lower voltage to higher voltage which are S 3 2− /S 3 •− , S 4 2− /S 4 •− and S 8 2− /S 8 , were discussed in Prof. Levillain's study [14][15][16][17]. Although there are more than ten species of polysulfides and sulfides form during the scanning process, only S 3 2− , S 4 2− and S 8 2− are oxidable while S 3…”

Section: Resultsmentioning

confidence: 99%

Preparation and performance of a core–shell carbon/sulfur material for lithium/sulfur battery

Wang

Chen

Shi

et al. 2010

Electrochimica Acta

119

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Section: Resultsmentioning

confidence: 99%

Preparation and performance of a core–shell carbon/sulfur material for lithium/sulfur battery

Wang

Chen

Shi

et al. 2010

Electrochimica Acta

119

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“…[15][16][17][18][19]21 Previous cyclic voltammetric experiments found that (1) the redox reactions of sulfur proceed much faster in DMF than in glyme solvents (e.g., DME and DEGDME), the most common solvents for the electrolyte of Li S cells, and (2) the second redox reaction features high reversibility. [15][16][17][18][19]21 Previous cyclic voltammetric experiments found that (1) the redox reactions of sulfur proceed much faster in DMF than in glyme solvents (e.g., DME and DEGDME), the most common solvents for the electrolyte of Li S cells, and (2) the second redox reaction features high reversibility.…”

Section: Articlementioning

confidence: 99%

“…[5][6][7][8][9][10][11][12][13][14] Thus, the electrochemical performance of Li S batteries has been notably improved in terms of cyclability and capacity. [15][16][17][18][19][20][21] This feature is thought to be associated with the solubility and solvated structure of polysulfide intermediates, which are sensitive to the surrounding solvent system. [10][11][12][13][14] The tendency of many studies being oriented on physical methods may be attributed to the lack of an in-depth understanding of the physicochemical properties of polysulfides in an electrolyte, such as their chemical or physical interactions with electrolytes and the importance of their solubility on the electrochemical behavior of a sulfur cathode.…”

Section: Introductionmentioning

confidence: 99%

Essential Features of Electrolyte Solvents that Enable High‐Performance LiS Batteries

Kang

Kim

Park

et al. 2019

Bulletin Korean Chem Soc

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In a lithium-ion battery, the organic solvent in the electrolyte simply acts as a medium that facilitates ionic charge transfer, whereas for the lithium-sulfur (Li-S) battery, the choice of the electrolyte is critical as it influences the chemical nature of the soluble polysulfides and the cycling stability of the lithium metal anode. Li-S batteries currently use ether-based electrolytes with high polysulfide solubility. Until now, however, the necessary requirements and the roles of the electrolytes have been inconclusive. This work elucidates the essential features and functions of the electrolyte based on an intensive investigation into 17 variants of solvents. Furthermore, examples of electrolytes for high performance, rechargeable Li-S batteries are suggested. The three major study procedures are (1) analyzing the chemical stability of reactive polysulfide species and lithium metal in the solvents of choice, (2) inspecting the chemical reactivity of lithium metal in a polysulfide solution, and (3) evaluating the influences of the solvent on the performance of Li-S cells. Based on the chemical and electrochemical test results, we suggest that the stability of the active materials (i.e., lithium metal and lithium polysulfides) should be ensured in an electrolyte for the proper operation of Li-S cells, that chemical reactions between the polysulfide species and lithium metal should be negligible during the charge-discharge process. In addition, we have confirmed that the high polysulfide solubility is essential for high rate performance.

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“…In contrast, the charge (electron) transfer process of a sulfur cathode can be described by interfacial electrochemistry, such as the redox flow cell of a V ) exist in electrolyte solutions and participate in electrode reactions occurring at the electrode/electrolyte interface. [5][6][7][8] The dissolution of polysulfides is inevitable and essential to the normal operation of Li-S batteries. For this reason, electrodes (e.g., carbon) with a large surface area and good conductivity are required for the facile redox reactions of S 8 /S 8 2− and S 3 − /S 3 2− couples.…”

Section: Introductionmentioning

confidence: 99%

Influence of Electrolyte Composition on Electrochemical Performance of Li-S Cells

Kim¹,

Jeong²,

Koh³

et al. 2014

Bulletin of the Korean Chemical Society

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The electrochemical performance of Li-S cells was investigated in various ternary electrolyte solutions composed of 1,2-dimethoxyethane (DME), tetra(ethylene glycol) dimethyl ether (TGM), and 1,3-dioxolane (DOX). The discharge capacity values and cycle data obtained at each composition were statistically treated with the Minitab program to obtain mixture contour plots, from which the optimal composition of the ternary solvent systems was predicted. The discharge capacities and capacity retention were quite dependent on the electrolyte composition. It was estimated from the contour plots of the capacity at 1.0 C that the discharge capacity sharply increased with a decrease in the TGM content. High capacities greater than 900 mAh/g at 1.0 C were expected for the electrolyte composition with a volume ratio of DME/TGM/DOX = 1/0/1. In contrast, it was predicted from the mixture contour plot of the capacity retention that the cycle performance would significantly increase with an increase in the DME content.

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Polysulfides in dimethylformamide: Only the radical anions S3− and S4− are reducible

Cited by 50 publications

References 16 publications

Preparation and performance of a core–shell carbon/sulfur material for lithium/sulfur battery

Preparation and performance of a core–shell carbon/sulfur material for lithium/sulfur battery

Essential Features of Electrolyte Solvents that Enable High‐Performance LiS Batteries

Influence of Electrolyte Composition on Electrochemical Performance of Li-S Cells

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