Inhibition of polysulfide shuttling in high-polarity electrolytes via liquid/quasi-solid interface in lithium-sulfur batteries
Inhibition of polysulfide shuttling in high-polarity electrolytes via liquid/quasi-solid interface in lithium-sulfur batteries
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DOI：
10.1007/s40843-022-2154-8
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
Zhijie Guo;Xiaosheng Song;Xiaobing Wang;Chenxiao Wang;Xuhui An;Xiao Liu;Wenhao Wu;Tengfei Bian;Yong Zhao
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文献类型：
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作者：
Zhijie Guo;Xiaosheng Song;Xiaobing Wang;Chenxiao Wang;Xuhui An;Xiao Liu;Wenhao Wu;Tengfei Bian;Yong Zhao
穿梭效应是锂硫（Li-S）电池的基础研究和实际应用中最显著的挑战之一，特别是在含有富集多硫化物的高极性电解质中。在这里，我们展示了一个概念验证的研究表明，这个问题可以通过构建一个液态/准固态（LS/QSS）两相界面，由高极性QSS电解质和弱极性LS一个解决。弱极性电解质对多硫化物的溶解性可忽略不计，与Li金属的相容性良好，导致Li阳极在Li/Li对称电池中的循环稳定性显著提高，超过1400 h。此外，在具有富含多硫化物的LS/QSS电解质的Li-S电池中实现了超过300次循环。这一发现表明LS/QSS电解质可以有效地抑制电解质组分与锂金属之间的化学反应。LS/QSS两相电解质的概念为高极性溶剂在能量转换/存储器件中的应用提供了新的策略。
The shuttle effect is one of the most notable challenges in the fundamental research and practical use of lithium-sulfur (Li-S) batteries, especially within high-polarity electrolytes containing enriched polysulfides. Herein, we demonstrate a proof-of-concept study showing that the issue can be resolved by constructing a liquid-state/quasi-solid-state (LS/QSS) two-phase interface that is composed of a high-polarity QSS electrolyte and a weak-polarity LS one. The weak-polarity electrolyte shows negligible solubility to polysulfides and good compatibility to Li metal, resulting in the substantially improved cyclic stability of the Li anode for more than 1400 h in Li∣Li symmetrical cells. Moreover, over 300 cycles were achieved in the Li-S battery with the polysulfide-enriched LS/QSS electrolyte. This finding indicates that the LS/QSS electrolyte can effectively suppress the chemical reaction between electrolyte components and lithium metal. The concept of LS/QSS two-phase electrolyte provides a new strategy for the application of high-polarity solvents in energy conversion/storage devices.