电解质
化学物理
离子
石英晶体微天平
电化学
锂(药物)
溶剂化
偶极子
材料科学
化学
电极
纳米技术
吸附
物理化学
有机化学
内分泌学
医学
作者
Ezzoubair Bendadesse,Anatolii V. Morozov,Artem M. Abakumov,Hubert Perrot,Jean-Marie Tarascon,Ozlem Sel
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-08-19
卷期号:16 (9): 14907-14917
被引量:3
标识
DOI:10.1021/acsnano.2c05784
摘要
A major feature of the electrolyte/electrode interface (EEI) that affects charge storage in lithium-ion batteries is the electrical double layer (EDL), but most of the available experimental approaches for probing its structuration have limitations due to electrical field and redox reaction disturbances, hence explaining why it is frequently overlooked. Herein we show that this is no longer true by using an advanced electrochemical quartz crystal microbalance (EQCM)-based method in the form of ac-electrogravimetry. For proof of concept, we studied the effect of various solvent/salt combinations, differing in their dipole moment and size/weight, respectively, on the structure of the EDL forming at the EEI of LixMoO3. We show that a significant amount of solvated lithium ions and anions contribute to charge compensation at the interface, and by varying the nature of the solvents (cyclic vs noncyclic), we provide a solid experimental proof of the direct relationship between the ions' solvation and solvent polarity. Moreover, we demonstrated a disappearance of the anionic motion in the less polar solvent (DMC) most likely due to plausible formation of contact ion pairs and agglomerates at the EDL level. Altogether, ac-electrogravimetry, when combined with classical EQCM, stands as an elegant and powerful method to experimentally assess the chemical structure and dynamics of the electrical double layer. We hope that the community will start to adopt it to better engineer interfaces of electrochemical energy storage devices.
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