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Binary Mixtures of Highly Concentrated Tetraglyme and Hydrofluoroether as a Stable and Nonflammable Electrolyte for Li–O2 Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-07-13 00:00:00 , DOI: 10.1021/acsami.8b08346
Qin Zhao 1 , Yuhang Zhang 1 , Guiru Sun 1 , Lina Cong 1 , Liqun Sun 1 , Haiming Xie 1 , Jia Liu 1
Affiliation  

Developing a long-term stable electrolyte is one of the most enormous challenges for Li–O2 batteries. Equally, the high flammability of frequently used solvents seriously weakens the electrolyte safety in Li–O2 batteries, which inevitably restricts their commercial applications. Here, a binary mixture of highly concentrated tetraglyme electrolyte (HCG4) and 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether (TTE) was used for a novel electrolyte (HCG4/TTE) in Li–O2 batteries, which exhibit good wettability, enhanced ionic conductivity, considerable nonflammability, and high electrochemical stability. Being a co-solvent, TTE can contribute to increasing ionic conductivity and to improving flame retardance of the as-prepared electrolyte. The cell with this novel electrolyte displays an enhanced cycling stability, resulting from the high electrochemical stability during cycling and the formation of electrochemically stable interfaces prevents parasitic reactions occurring on the Li anode. These results presented here demonstrate a novel electrolyte with a high electrochemical stability and considerable safety for Li–O2 batteries.

中文翻译:

高浓度Tetraglyme和氢氟醚的二元混合物,是Li-O 2电池的稳定且不易燃的电解质

对于Li-O 2电池而言,开发长期稳定的电解质是最大的挑战之一。同样,常用溶剂的高度可燃性严重削弱了Li-O 2电池的电解质安全性,这不可避免地限制了它们的商业应用。在这里,高浓度四甘醇二甲醚电解质(HCG4)和1,1,2,2-四氟乙基2,2,3,3-四氟丙基醚(TTE)的二元混合物用于Li–中的新型电解质(HCG4 / TTE) Ø 2电池,具有良好的润湿性,增强的离子电导率,显着的不燃性和较高的电化学稳定性。作为助溶剂,TTE有助于提高离子电导率并改善所制备电解质的阻燃性。具有这种新型电解质的电池显示出增强的循环稳定性,这归因于循环过程中的高电化学稳定性,而电化学稳定界面的形成可防止在Li阳极上发生寄生反应。本文介绍的这些结果证明了一种新颖的电解质,具有高电化学稳定性,并且对Li-O 2电池具有相当大的安全性。
更新日期:2018-07-13
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