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A theory and a simulation capability for the growth of a solid electrolyte interphase layer at an anode particle in a Li-ion battery

Author(s)
Rejovitzky, Elisha; Di Leo, Claudio V; Anand, Lallit
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Abstract
A major mechanism for electrochemical aging of Li-ion batteries is the growth of a solid electrolyte interphase (SEI) layer on the surface of anode particles, which leads to capacity fade and also results in a rise in cell resistance. We have formulated a continuum theory for the growth of an SEI layer—a theory which accounts for the generation of the attendant growth stresses. The theory has been numerically implemented in a finite-element program. This simulation capability for SEI growth is coupled with our previously published chemo-mechanical simulation capability for intercalation of Li-ions in electrode particles. Using this new combined capability we have simulated the formation and growth of an SEI layer during cyclic lithiation and delithiation of an anode particle, and predicted the evolution of the growth stresses in the SEI layer. The evolution of the stress state within the SEI layer and at the SEI/anode-particle interface for spherical- and spheroidal-shaped graphite particles is studied. This knowledge of the local interfacial stresses provides a good estimate for the propensity of potential delamination of an SEI layer from an anode particle.
Date issued
2015-02
URI
http://hdl.handle.net/1721.1/108577
Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Journal
Journal of the Mechanics and Physics of Solids
Publisher
Elsevier
Citation
Rejovitzky, Elisha, Claudio V. Di Leo, and Lallit Anand. “A Theory and a Simulation Capability for the Growth of a Solid Electrolyte Interphase Layer at an Anode Particle in a Li-Ion Battery.” Journal of the Mechanics and Physics of Solids 78 (May 2015): 210–230.
Version: Author's final manuscript
ISSN
00225096

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