Self-Crosslinking Poly(Ethylene Glycol) Diglycidyl Ether in Water-in-Salt Electrolytes for Minimal Hydrogen Evolution Reactions and Extended LiTFSI Solubility

电解质 差示扫描量热法 乙二醇 溶解 溶解度 化学工程 化学 无机化学 材料科学 有机化学 电极 物理化学 热力学 物理 工程类
作者
Tobias Burton,Yachao Zhu,Léa Droguet,Rossukon Jommongkol,Dodzi Zigah,Alexis Grimaud,Jean‐Marie Tarascon,Olivier Fontaine
出处
期刊:Journal of The Electrochemical Society [Institute of Physics]
卷期号:169 (7): 070533-070533 被引量:1
标识
DOI:10.1149/1945-7111/ac8245
摘要

Water-in-salt electrolytes - WISEs - are prevailing thanks to their compelling extended voltage window due to the reduced free water molecules at the electrode interface. However, as has been reported elsewhere, free-water content still can be reduced further. In our previous work, an unstable phenomenon of solid electrolyte interphase (SEI) and salt precipitation/dissolution issue were revealed. Herein, we propose a novel approach in order to alleviate those issues using poly(ethylene glycol) diglycidyl ether (PDE) as an additive. Indeed, upon mixing LiTFSI, water and PDE at high concentrations, we observed a ring-opening reaction of PDE that was confirmed via Raman spectroscopy, FTIR and ionic conductivity measurements. These crosslinked networks could also increase the solubility limits of LiTFSI in water, which was identified by adding more LiTFSI or LiOTf. Differential scanning calorimetry (DSC) measurement demonstrated that these crosslinked electrolytes effectively suppress the crystallization of water molecules with the WISE. Linear sweep voltammetry (LSV) measurements revealed that these novel crosslinked electrolytes considerably reduce free water content which effectively drives the HER to more negative potentials. More significantly, the SEI formed with these novel electrolytes remains present and stable on the electrode surface after a resting period of 1 h. Our work herein offers a new approach to tackling SEI instability and precipitation/dissolution issues.
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