4점 탐침 측정법을 이용한 고상전해질계면의 비저항 측정 : Direct Measurement of Electric Resistivity of Solid Electrolyte Interface Using 4-Point-Probe Technique
Direct Measurement of Electric Resistivity of Solid Electrolyte Interface Using 4-Point-Probe Technique
- 주제(키워드) Li-ion battery , solid electrolyte interface , resistivity , 4-point-probe technique , ab-initio calculation
- 발행기관 대한금속·재료학회
- 발행년도 2019
- 총서유형 Journal
- KCI ID ART002426300
- 본문언어 한국어
초록/요약
Lack of understanding on the electrical properties of the solid electrolyte interface (SEI) has been one of the major hurdles for developing fast charging Li-ion batteries. Here, we report our preliminary experimental result on the measurement of the electrical resistivity of SEI using the direct-contact technique based on electron microscopy combined with 4-point-probe micro-electrical method. We observed that the SEI layer, which covers uniformly the surface of the graphite anode, exhibits a high resistivity (2.3 × 105 Ω·m) comparable to those of typical insulators. In this study, using first principles calculations performed on the computational LixF1-x (0.25 < x < 0.75) phases, we elucidate the structural origin responsible for the measured resistivity of SEI by analyzing the electronic structures.
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