Direct Observation of
Inhomogeneous Solid Electrolyte
Interphase on MnO Anode with Atomic Force Microscopy and Spectroscopy
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Abstract
Solid electrolyte interphase (SEI) is an in situ formed
thin coating
on lithium ion battery (LIB) electrodes. The mechanical property of
SEI largely defines the cycling performance and the safety of LIBs
but has been rarely investigated. Here, we report quantitatively the
Young’s modulus of SEI films on MnO anodes. The inhomogeneity
of SEI film in morphology, structure, and mechanical properties provides
new insights to the evolution of SEI on electrodes. Furthermore, the
quantitative methodology established in this study opens a new approach
to direct investigation of SEI properties in various electrode materials
systems