As new Li-ion battery technologies are developed, techniques and methods are required to characterize several aspects of how device performance is impacted. In particular, the expansion of new electrolyte and binder chemistries including additives and non-carbonate replacements makes it necessary to develop methods which can follow the formation and evolution of the surface electrolyte interphase (SEI). As an electrochemically and chemically formed barrier the SEI is paramount to long term battery performance. Complimentary methods are used to evaluate materials and provide an opportunity to more thoroughly understand the mechanism which impact changes in performance. Using a combination of electrochemical and optical techniques the performance characteristics of SEI films can be evaluated while observing changes in the film optical properties. Data collected using spectroscopic ellipsometry and the models developed from the optical data provide a means to correlate changes in electrochemical performance and observed changes in the film. This presentation will discuss how these complimentary methods can be linked to evaluate a host of different electrolyte compositions and how the formation procedure can alter the characteristics of the SEI.

Use of complimentary methods to evaluate energy storage interfaces

248th National Meeting (2014)

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