Monitoring Polysulfide Solubility and Diffusion in Fluorinated Ether‐Based Electrolytes by Operando Raman Spectroscopy,Batteries & Supercaps

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Monitoring Polysulfide Solubility and Diffusion in Fluorinated Ether‐Based Electrolytes by Operando Raman Spectroscopy
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-01-29 , DOI: 10.1002/batt.201900188
Roza Bouchal ₁ , Athmane Boulaoued ₁ , Patrik Johansson _{1,

2}

Affiliation

Polysulfide (PS) solubility is a key property of Li−S battery electrolytes for the conversion reaction(s) at the electrolyte‐electrode interface. When PSs shuttle between the composite C/S cathode and the lithium metal anode, however, this leads to a continuous loss of active material and thus rapid capacity fading. In order to restrict the shuttle effect, fluorinated ethers have recently been proposed as a remedy; by only sparsely dissolving PSs they physically block the diffusion. We show here how the diffusion of PSs in fluorinated ethers, as monitored by operando Raman spectroscopy, is selective and that only short‐chain PS ( $urn:x-wiley:25666223:media:batt201900188:batt201900188-math-0001$ ) are soluble and diffuse. This fundamental observation can be used to further leverage the practical performance of Li−S batteries by novel electrolyte design.

中文翻译：

通过Operando拉曼光谱法监测含氟醚基电解质中多硫化物的溶解度和扩散

多硫化物（PS）的溶解度是Li-S电池电解质在电解质-电极界面发生转化反应的关键特性。但是，当PS在复合C / S阴极和锂金属阳极之间穿梭时，会导致活性材料连续损失，从而导致容量快速衰减。为了限制穿梭效应，最近提出了氟化醚作为一种补救方法。通过仅稀疏溶解PS，它们在物理上阻止了扩散。通过操作拉曼光谱监测，这里我们展示了PS在氟化醚中的扩散是选择性的，只有短链PS（ $缸：x-wiley：25666223：media：batt201900188：batt201900188-math-0001$ ）是可溶的和扩散的。通过新颖的电解质设计，这一基本观察结果可用于进一步利用Li-S电池的实际性能。

更新日期：2020-01-29

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