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

For citation:

Kolosnitsyn D. V., Egorova N. V., Khasanova R. V., Kuzmina E. V., Karaseva E. V., Kolosnitsyn V. S. Differentiation of electrode contributions to the total impedance of lithium-sulfur cells using the distribution function of relaxation times. Electrochemical Energetics, 2026, vol. 26, iss. 1, pp. 13-28. DOI: 10.18500/1608-4039-2026-26-1-13-28, EDN: NKNFTQ

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: 
541.136/.136.88
DOI: 
10.18500/1608-4039-2026-26-1-13-28
EDN: 
NKNFTQ

Differentiation of electrode contributions to the total impedance of lithium-sulfur cells using the distribution function of relaxation times

Autors: 
Kolosnitsyn Dmitry Vladimirovich, Ufa Institute of Chemistry of the Russian Academy of Sciences
Egorova Nadezhda V., Ufa Institute of Chemistry of the Russian Academy of Sciences
Khasanova Regina Venerovna, Ufa Institute of Chemistry of the Russian Academy of Sciences
Kuzmina Elena Vladimirovna, Ufa Institute of Chemistry of the Russian Academy of Sciences
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 analysis of electrochemical impedance of lithium-sulfur cells is complicated by the complexity of the processes occurring inside them. Both electrochemical processes and mass transport processes simultaneously occur on the lithium and sulfur electrodes of the cells, as well as in the bulk electrolyte. A comparative analysis of the distribution functions of relaxation times of symmetric Li||Li, S||Sand and the full lithium-sulfur cell has been conducted. Being a model-independent approach, the distribution functions of relaxation times method lets us objectively identify the number of relaxation processes and their relaxation times. The subsequent comparison of the data from the full and the symmetrical cells enables us to make a physically reasonable correlation of peaks on the distribution functions of relaxation times to specific electrodes.

Key words: 
lithium-sulfur cell (battery)
symmetrical cell
impedance
distribution of relaxation times
lithium electrode
sulfur electrode
Acknowledgments: 
The work was completed within the framework of a state assignment on the theme No. 124032600061-3 “Carbon materials and carbon-polymer composites as active components of positive and negative electrodes of promising energy storage devices. Synthesis, structure, properties” and theme 125020601630-6 “Solvate Ionic Liquids – Composition, Structure, Physicochemical, and Electrochemical Properties. Application in High-Energy Storage Devices – Lithium and Lithium-ion Batteries”. The studies were partially carried out using the 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: 
04.12.2025
Accepted: 
30.01.2026
Published: 
31.03.2026