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Title: Evaluation of the SEI using a multilayer spectroscopic ellipsometry model

A multilayer spectroscopic ellipsometry (SE) model has been developed to characterize SEI formation. The model, which consists of two Cauchy layers, is constructed with an inner layer meant to model primarily inorganic compounds adjacent to an electrode and an outer layer which mirrors polymeric, organic constituents on the exterior of the SEI. Comparison of 1:1 EC:EMC and 1:4 EC:EMC with 1.0 M LiPF6 shows distinct differences in the two modeled layers. The data suggest that the thickness of both layers change over a wide potential range. These changes have been linked with other reports on the growth of the SEI.
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Resource Type:
Journal Article
Resource Relation:
Journal Name: ECS Electrochemistry Letters; Journal Volume: 3; Journal Issue: 11
Research Org:
Idaho National Laboratory (INL)
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Country of Publication:
United States
25 ENERGY STORAGE; electrolyte; ellipsometry; solid electrolyte interphase