Monitoring the mechanical properties of the solid electrolyte interphase (SEI) using electrochemical quartz crystal microbalance with dissipation
| Autor: | Wenshan Jia, Song Jin, Xingbin Yan, Li-Jun Wan, Hongchang Jin, Zhiqiu Hu, Huanxin Ju, Yinguang Chai, Hengxing Ji |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Diethyl carbonate 02 engineering and technology General Chemistry Quartz crystal microbalance Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Shear modulus chemistry.chemical_compound Tetraethylene glycol dimethyl ether Viscosity chemistry Chemical engineering Propylene carbonate 0210 nano-technology Ethylene carbonate |
| Zdroj: | Chinese Chemical Letters. 32:1139-1143 |
| ISSN: | 1001-8417 |
| Popis: | Stable solid electrolyte interphase (SEI) has been well established to be critical for the reversible operation of Li (ion) batteries, yet our understanding of its mechanical properties currently remains incomplete. Here, we used an electrochemical quartz crystal microbalance combined with dissipation monitoring (EQCM-D) to investigate SEI formation. By quantitatively estimating in-situ, the change in mass, shear modulus, and viscosity of the SEI, we show that the SEI formation in propylene carbonate (PC)- and ethylene carbonate/diethyl carbonate (EC/DEC)-based electrolytes involves the growth of a rigid layer followed by a viscoelastic layer, whereas a distinct “one-layer” rigid model is applicable to the SEI formulated in tetraethylene glycol dimethyl ether (TEGDME)-based electrolyte. With the continuous formation of the SEI, its shear modulus decreases accompanied by an increase in viscosity. In TEGDME, the lightest/thinnest SEI (mass lower than in PC by a factor of nine) yet having the greatest stiffness (more than five times that in PC) is obtained. We attribute this behavior to differences in the chemical composition of the SEIs, which have been revealed by tracking the mass-change-per-mole-of-electron-transferred using EQCM-D and further confirmed by X-ray photoelectron spectroscopy. |
| Databáze: | OpenAIRE |
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