ISSN 1608-4039 (Print)
ISSN 1680-9505 (Online)

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Sheina L. V., Ionina A. ., Shakirova N. V., Karaseva E. V., Kolosnitsyn V. S. Physicochemical properties of lithium salt solutions in mixtures of sulfolane with dimethyl disulfide. Electrochemical Energetics, 2026, vol. 26, iss. 1, pp. 39-51. DOI: 10.18500/1608-4039-2026-26-1-39-51, EDN: UDCNBN

This is an open access article distributed under the terms of Creative Commons Attribution 4.0 International License (CC-BY 4.0).
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Language: 
Russian
Heading: 
Hydrogen energy
Article type: 
Article
UDC: 
544.6.018.462
DOI: 
10.18500/1608-4039-2026-26-1-39-51
EDN: 
UDCNBN

Physicochemical properties of lithium salt solutions in mixtures of sulfolane with dimethyl disulfide

Autors: 
Sheina Ludmila Vladimirovna,
Ionina Alena M., Ufa Institute of Chemistry of the Russian Academy of Sciences
Shakirova N. V., Institute of Organic Chemistry of the Ufa RAS Scientific Center
Karaseva Elena Vladimirovna, Institute of Organic Chemistry of the Ufa RAS Scientific Center
Kolosnitsyn Vladimir Sergeevich, Institute of Organic Chemistry of the Ufa RAS Scientific Center
Abstract: 

The physicochemical properties of lithium salt solutions in the mixtures of sulfolane with dimethyl disulfide were studied. It was established that the introduction of dimethyl disulfide (5–10% mas.) into sulfolane solutions of lithium perchlorate and lithium trifluoromethanesulfonate leads to the increase in their specific ion conductivity, the decrease in the viscosity, and the reduction in the activation energies of the specific ion conductivity and the viscous flow. The decrease in the corrected conductivity of sulfolane solutions of lithium salts upon the introduction of dimethyl disulfide indicates the decrease in the degree of the electrolytic dissociation of lithium salts. The most significant decrease in the corrected electrical conductivity is observed for lithium perchlorate solutions. The introduction of dimethyl disulfide improves the low-temperature properties of lithium perchlorate and lithium trifluoromethanesulfonate solutions in sulfolane: the melting point decreases and the temperature range of the metastable liquid-phase state expands.

Key words: 
electrolyte solutions
lithium perchlorate
lithium trifluoromethanesulfonate
sulfolane
dimethyl disulfide
lithium batteries
Acknowledgments: 
The work was completed within the framework of a state assignment on the theme No. 125020601630-6 “Solvate Ionic Liquids – Composition, Structure, Physicochemical, and Electrochemical Properties. Application in High-Energy Storage Devices – Lithium and Lithium-ion Batteries”. Part of the research was supported by the Russian Foundation for Basic Research, Project No. 21-53-46005, “Electrolyte as a Key Factor Determining the Specific Energy of Lithium-Sulfur Batteries”. The studies were partially carried out using equipment from the Center of Collective Use “Chemistry” of Ufa Institute of Chemistry of the UFRC RAS and the Regional Center of Collective Use “Agidel” of the UFRC RAS.
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Received: 
26.12.2025
Accepted: 
30.01.2026
Published: 
31.03.2026