Binary Mixtures of Highly Concentrated Tetraglyme and Hydrofluoroether as a Stable and Nonflammable Electrolyte for Li-O2 Batteries

ACS Applied Materials & Interfaces
Qin ZhaoJia Liu

Abstract

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.

References

Jun 22, 2012·Nature Chemistry·Hun-Gi JungBruno Scrosati
Nov 30, 2012·Journal of the American Chemical Society·Muhammed M Ottakam ThotiylPeter G Bruce
Jun 15, 2013·Journal of the American Chemical Society·Bertrand PhilippeKristina Edström
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Jan 26, 2017·ACS Applied Materials & Interfaces·Hoi-Min KwonMasayoshi Watanabe

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Citations

Dec 31, 2020·ACS Central Science·Gang HuangXinbo Zhang
Feb 25, 2020·Chemical Reviews·Tao LiuClare P Grey
Nov 12, 2020·Chemical Reviews·Ji-Guang ZhangJun Liu
Mar 7, 2020·Chemical Reviews·Won-Jin KwakDoron Aurbach

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