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

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Ushakov A. V., Rybakov K. S., Khrykina A. V., Gamayunova I. M. Probabilistic models of the capacity of the electrode material in a wide range of current loads. Electrochemical Energetics, 2024, vol. 24, iss. 2, pp. 59-75. DOI: 10.18500/1608-4039-2024-24-2-59-75, EDN: UYAMCU

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Language: 
Russian
Heading: 
Lithium electrochemical systems
Article type: 
Article
UDC: 
544.643+544.651
DOI: 
10.18500/1608-4039-2024-24-2-59-75
EDN: 
UYAMCU

Probabilistic models of the capacity of the electrode material in a wide range of current loads

Autors: 
Ushakov Arseni Vladimirovich, Saratov State University
Rybakov Kirill Sergeevich, Saratov State University
Khrykina Anna V., Saratov State University
Gamayunova Irina Mikhailovna, Saratov State University
Abstract: 

An approach for constructing mathematical models of the current dependence of the capacity of electrode materials is proposed. The approach involves analyzing the probabilities of favorable and unfavorable events occurring on the elements of electrical equivalent circuits that can be used to model the electrode. Several probabilistic models that correspond to different combinations of a capacitor, a Warburg element and a constant phase element in an electrical circuit are proposed. As an example, the validation of specific models to describe the experimental current dependences of the capacity of Li3V2(PO4)3 or Li4Ti5O12 based composite electrodes with carbon nanomaterial is shown. The approach allows approximating such dependencies for a wide range of current loads – from 0.1 to 50 C.

Key words: 
Li-ion battery
capacity modeling
Peukert’s law
probability
lithium vanadium phosphate
lithium titanate
Acknowledgments: 
The work was supported by the Russian Science Foundation (project No. 21-73-10091)
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Received: 
01.04.2024
Accepted: 
08.05.2024
Published: 
28.06.2024