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The Importance of a Moving Boundary Approach for Modeling the SEI Layer Growth to Predict Capacity Fade

Journal Article · · Journal of the Electrochemical Society
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One of the contributing factors to the aging of lithium-ion batteries is the growth of the solid-electrolyte interphase (SEI) layer. The growth of the SEI layer leads to the irreversible loss of lithium available for cycling and increases the resistance of the battery. Physics-based models in literature model the kinetically limited or solvent diffusion-limited growth. In such models, the interface resistance is a constant, and the contribution to the overpotential of the intercalation reaction from the SEI layer is considered to be ohmic. In this study, we propose a model that describes the growth of the SEI layer on the electrode surface as a moving interface. The transport of lithium ions and the solvent in the electrolyte are affected by this moving interface. The equations that govern the species transport and the potential drop across the SEI layer are derived from dilute solution theory and solved by transforming the coordinates of the moving boundary. The ion transport induces changes in the conductivity across the SEI layer, which affects the potential drop that arises due to its growth. The effects of this potential on capacity fade are studied over cycling the battery.

Sponsoring Organization:
USDOE Office of Electricity (OE)
Grant/Contract Number:
NONE; AC05-76RL01830
OSTI ID:
2325347
Alternate ID(s):
OSTI ID: 1862073
OSTI ID: 1877102
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 4 Vol. 169; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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