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Vol.57, No.1, 67 ~ 71, 2019
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| Title |
| Direct Measurement of Electric Resistivity of Solid Electrolyte Interface Using 4-Point-Probe Technique |
| 박준형 Jun-hyoung Park , 최용석 Yong-seok Choi , 심형철 Hyung Cheoul Shim , 안재평 Jae-pyoung Ahn , 이재철 Jae-chul Lee |
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| 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) |
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| Key Words |
| Li-ion battery, solid electrolyte interface, resistivity, 4-point-probe technique, ab-initio calculation |
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