The reaction mechanisms of polysulfides in the electrolytes of lithium sulfur (Li−S) batteries are known to be complex. These reaction mechanisms may also change with the electrolyte used. Understanding the reaction steps of the polysulfides in a Li−S battery electrolyte is important to assess the underlying phenomena behind the Li−S cell performance limitations. Here, we investigate the reaction steps of polysulfides in electrolyte solutions containing S₈, Li₂S₈ and Li₂S₆ in 1 M LiTFSI in TEGDME : DOL (v/v 1 : 1) (one of the most interesting electrolytes for use in Li−S batteries), using experimental cyclic voltammetry and a mathematical model. The mathematical model assists in understanding the reaction steps behind the characteristics changes of cyclic voltammograms (CVs) with the scan rate and polysulfides speciation. Our systematic study shows that the reaction steps conventionally used in Li−S battery models are not sufficient to simulate all the CV characteristics of the investigated electrolyte solutions.

中文翻译：

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使用循环伏安法实验和建模了解TEGDME：DOL中1 M LiTFSI中涉及多硫化物的反应步骤

已知锂硫（Li-S）电池电解质中多硫化物的反应机理很复杂。这些反应机理也可能随所用电解质而变化。了解Li-S电池电解质中多硫化物的反应步骤对于评估Li-S电池性能限制背后的潜在现象很重要。在这里，我们研究了多硫化物在含有S ₈，Li ₂ S ₈和Li ₂ S _6的电解液中的反应步骤使用实验循环伏安法和数学模型，在TEGDME：DOL（v / v 1：1）（用于Li-S电池中最有趣的电解质之一）中加入1 M LiTFSI。该数学模型有助于理解循环伏安图（CV）随扫描速率和多硫化物形态形成的特征变化背后的反应步骤。我们的系统研究表明，Li-S电池模型中常规使用的反应步骤不足以模拟所研究电解液的所有CV特性。