| Title |
Direct Measurement of Electric Resistivity of Solid Electrolyte Interface Using 4-Point-Probe Technique |
| Authors |
박준형(Jun-hyoung Park); 최용석(Yong-seok Choi); 심형철(Hyung Cheoul Shim); 안재평(Jae-pyoung Ahn); 이재철(Jae-chul Lee) |
| DOI |
https://doi.org/10.3365/KJMM.2019.57.1.67 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Li-ion battery; solid electrolyte interface; resistivity; 4-point-probe technique; ab-initio calculation |
| Abstract |
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.(Received September 4, 2018; Accepted September 19, 2018) |