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박준형· 최용석· 심형철· 안재평· 이재철
4점 탐침 측정법을 이용한 고상전해질계면의 비저항 측정 (Direct Measurement of Electric Resistivity of Solid Electrolyte Interface using 4-Point-Probe Technique)
Received: 4 September 2018;  Accepted: 19 September 2018.  Published online: 11 October 2018.
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.
Keywords: Li-ion battery, solid electrolyte interface, resistivity, 4-point-probe technique, ab-initio calculation
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