Spectroscopic Analysis of Electrolyte Solutions with Diverse Metal Ions for Aqueous Zinc-Ion Batteries

Sangyup Lee; Eunji Kim; Paul Maldonado Nogales; Soon Ki Jeong

doi:10.4028/p-WkSZ7w

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HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 151Spectroscopic Analysis of Electrolyte Solutions...

Spectroscopic Analysis of Electrolyte Solutions with Diverse Metal Ions for Aqueous Zinc-Ion Batteries

Abstract:

The water-in-salt method, recognized for regulating metal ion solvation structure, garners attention in secondary batteries for its potential to broaden the electrolyte's operational range and reduce side reactions. However, the understanding of how anion size variations impact metal ion solvation structure remains limited. This study addresses the gap by employing mixed electrolytes with diverse anion sizes, investigating the effects of electrolyte concentration and anion size on the solvation structure of zinc cations crucial in electrochemical reactions. Various analytical techniques, including FT-IR, Raman, and NMR spectroscopy, are utilized. Mixed electrolytes are formulated by dissolving ZnCl₂ and Zn (NO₃)₂ in water (1.0 mol kg^‒1), with the addition of LiCl and LiNO₃ (0.1 to 19.0 mol kg^‒1). FT-IR and Raman analyses reveal weakened hydrogen bonds with increasing electrolyte concentration. Elevated concentration disrupts bonds between Li⁺ ions and water molecules, resulting in alterations in solvation structure. NMR and FT-IR spectra exhibit distinct behaviors, suggesting influences from molecular bonding structure and anion size, intricately linked to the specific salt used in electrolyte preparation.

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Periodical:

Advances in Science and Technology (Volume 151)

Pages:

33-38

DOI:

https://doi.org/10.4028/p-WkSZ7w

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Online since:

June 2024

Authors:

Sangyup Lee, Eunji Kim, Paul Maldonado Nogales, Soon Ki Jeong*

Keywords:

Aqueous Electrolyte, Energy Storage, Solvation, Spectroscopy, Zinc-Ion Battery

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* - Corresponding Author

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