Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 121, Issue 47, Pages 26233-26240Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b09465
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Funding
- Office of Energy Efficiency and Renewable Energy (EERE), U.S. Department of Energy [DE-EE0007766]
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Capacity fade in lithium-ion batteries largely originates from the undesired electrolyte decomposition, which results in the formation of solid electrolyte. interphase (SEI) and the anode surface passivation. In this work, a mesoscale interfacial modeling approach is developed to investigate the formation and growth of the SEI film on a typical graphite based anode over several cycles. It is found that lithium diffusion kinetics in the SEI film significantly affects the SEI growth rate. A lower lithium diffusion barrier leads to a higher growth rate. The present model demonstrates that the SEI thickness is a linear function of the square root of the charging time over long-time cycling. Growth of multicomponent SEI film is also elucidated. It is found that the heterogeneity of the SEI film may lead to instability in lithium ion concentration distribution.
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