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

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Karaseva E. V., Kolosnitsyn D. V., Kuz'mina E. V., Kolosnitsyn V. S. The effect of surface capacity of positive electrodes on cycle life of lithium-sulfur batteries. Electrochemical Energetics, 2022, vol. 22, iss. 3, pp. 113-128. DOI: 10.18500/1608-4039-2022-22-3-113-128, EDN: BAROQI

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Language: 
Russian
Heading: 
Lithium electrochemical systems
Article type: 
Article
UDC: 
541.136/.136.88
DOI: 
10.18500/1608-4039-2022-22-3-113-128
EDN: 
BAROQI

The effect of surface capacity of positive electrodes on cycle life of lithium-sulfur batteries

Autors: 
Karaseva Elena Vladimirovna, Institute of Organic Chemistry of the Ufa RAS Scientific Center
Kolosnitsyn Dmitry Vladimirovich, Ufa Institute of Chemistry of the Russian Academy of Sciences
Kuz'mina 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 effect of sulfur content in positive electrodes (the surface capacity of sulfur electrodes) on the characteristics (such as the depth of sulfur electrochemical reduction, changes in capacitance and Coulomb efficiency during cycle life) of lithium-sulfur cells with electrolytes based on sulfolane was studied. It was shown that the reason for the capacitance decrease of the lithium-sulfur cells at the early stage of its cycle life is the displacement of sulfur of the porous positive electrode from the rear regions into the front ones. It was established that in order to achieve the maximum possible specific energy of the lithium-sulfur batteries with the electrolytes based on sulfolane, the surface capacitance of the positive electrodes should be in the range of 2-3 mA⋅h/cm2.

Key words: 
lithium-sulfur cells (batteries)
sulfur content in a positive electrode
surface capacitance of sulfur electrode
lithium polysulfides
cycling
sulfolane-based electrolytes
Acknowledgments: 
The work was performed on the equipment of the Center for Collective Use “Chemistry”.
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Received: 
13.10.2022
Accepted: 
24.10.2022
Published: 
30.11.2022