Direct-Contact Microelectrical Measurement of the Electrical Resistivity of a Solid Electrolyte Interface

Jun Hyoung Park, Yong Seok Choi, Hyun Jeong Lee, Hyung Cheoul Shim, Jae Pyoung Ahn, Jae-chul Lee

Research output: Contribution to journalArticle

Abstract

Because of its effectiveness in blocking electrons, the solid electrolyte interface (SEI) suppresses decomposition reactions of the electrolyte and contributes to the stability and reversibility of batteries. Despite the critical role of SEI in determining the properties of batteries, the electrical properties of SEI layers have never been measured directly. In this paper, we present the first experimental results of the electrical resistivity of a LiF-rich SEI layer measured using a direct-contact microelectrical device mounted in an electron microscope. Measurements show that the SEI layer exhibits high electrical resistivity (2.3 × 105 ω·m), which is comparable with those of typical insulating materials. Furthermore, a combined technique of advanced analyses and first-principles calculations show that the SEI layer is mainly composed of amorphous LiF and a minute nanocrystalline Li2CO3 compound. The electronic origin responsible for the high resistivity of the SEI layer is elucidated by calculating the band structures of various LixF compounds and interpreting their effects on the resistivity. This study explains why SEI can prevent the degradation of electrode materials and consumption of Li ions in the electrolyte and thus can be viewed as a stepping stone for developing highly stable and reversible batteries.

Original languageEnglish
JournalNano Letters
DOIs
Publication statusPublished - 2019 Jan 1

Fingerprint

Solid electrolytes
solid electrolytes
electrical resistivity
electric batteries
Electrolytes
electrolytes
Insulating materials
electrode materials
insulation
Band structure
Electric properties
Electron microscopes
electron microscopes
electrical properties
Ions
degradation
Decomposition
decomposition
Degradation
Electrodes

Keywords

  • electrical resistivity
  • first-principles calculations
  • four-point-probe technique
  • Li-ion battery
  • solid electrolyte interface

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Direct-Contact Microelectrical Measurement of the Electrical Resistivity of a Solid Electrolyte Interface. / Park, Jun Hyoung; Choi, Yong Seok; Lee, Hyun Jeong; Shim, Hyung Cheoul; Ahn, Jae Pyoung; Lee, Jae-chul.

In: Nano Letters, 01.01.2019.

Research output: Contribution to journalArticle

Park, Jun Hyoung ; Choi, Yong Seok ; Lee, Hyun Jeong ; Shim, Hyung Cheoul ; Ahn, Jae Pyoung ; Lee, Jae-chul. / Direct-Contact Microelectrical Measurement of the Electrical Resistivity of a Solid Electrolyte Interface. In: Nano Letters. 2019.
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