Correlating Nanoscale Structures with Electrochemical Properties of Solid Electrolyte Interphases in Solid-State Battery Electrodes

Jimin Oh, Gun Park, Hongjun Kim, Sujung Kim, Dong Ok Shin, Kwang Man Kim, Hye Ryung Byon, Young Gi Lee, Seungbum Hong

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Here, we investigate the nonlinear relationship between the content of solid electrolytes in composite electrodes and the irreversible capacity via the degree of nanoscale uniformity of the surface morphology and chemical composition of the solid electrolyte interphase (SEI) layer. Using electrochemical strain microscopy (ESM) and X-ray photoelectron spectroscopy (XPS), changes of the chemical composition and morphology (Li and F distribution) in SEI layers on the electrodes as a function of solid electrolyte contents are analyzed. As a result, we find that the solid electrolyte content affects the variation of the SEI layer thickness and chemical distributions of Li and F ions in the SEI layer, which, in turn, influence the Coulombic efficiency. This correlation determines the composition of the composite electrode surface that can maximize the physical and chemical uniformity of the solid electrolyte on the electrode, which is a key parameter to increase electrochemical performance in solid-state batteries.

Original languageEnglish
Pages (from-to)26660-26669
Number of pages10
JournalACS applied materials & interfaces
Volume15
Issue number22
DOIs
StatePublished - 7 Jun 2023

Keywords

  • chemical composition
  • composite electrode
  • nanoscale morphology
  • solid electrolyte interphase (SEI)
  • solid-state battery

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