Lithiation induced volume changes in battery electrode materials lead to a variety of chemo-mechanical phenomena.  It is difficult to investigate these mechanisms directly in complex electrode microstructures that consist of powdered active components, conductive filler, and binders.  Thin films provide an opportunity to more directly investigate fundamental processes, by combining in situ stress data with conventional in situ electrochemical measurements.  Three examples that demonstrate this approach will be highlighted: (1) the formation of the solid-electrolyte interphase (SEI) layer on graphitic carbon films, where disruption of the near surface leads to stresses that impact the SEI stability; (2) the stress-induced response of interfaces in model Si-based nanocomposite structures, (3) the role of stress and oxygen non-stoichiometry on phase transformations in vanadium oxide films.

Chemically induced stresses in Li ion battery electrodes

245th National Meeting (2013)

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