Revealing the structural degradation mechanism of the Ni-rich cathode surface: How thick is the surface?
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kang, Yoon-Sok | - |
dc.contributor.author | Park, Seong Yong | - |
dc.contributor.author | Ito, Kimihiko | - |
dc.contributor.author | Kubo, Yoshimi | - |
dc.contributor.author | Shin, Yongwoo | - |
dc.contributor.author | Kim, Dong Young | - |
dc.contributor.author | Seo, Dong-Hwa | - |
dc.contributor.author | Kim, Soojin | - |
dc.contributor.author | Park, Jin-Hwan | - |
dc.contributor.author | Doo, Seok-Gwang | - |
dc.contributor.author | Koh, Meiten | - |
dc.contributor.author | Seo, Jin Ah | - |
dc.contributor.author | Park, Kwangjin | - |
dc.date.available | 2021-03-17T00:40:07Z | - |
dc.date.created | 2021-02-05 | - |
dc.date.issued | 2021-04 | - |
dc.identifier.issn | 0378-7753 | - |
dc.identifier.uri | https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/80451 | - |
dc.description.abstract | Improving the cycling performance of Ni-rich LiNixCoyMnzO2 (NCM, 0 ≤ x,y,z < 1) is critical for commercializing rechargeable batteries based on Ni-rich NCM cathodes. Herein, we studied the structural degradation of Ni-rich NCM/graphite cylindrical 18650-type cells as a function of the cutoff voltage in the 4.2–4.4 V range by electrochemical impedance spectroscopy (EIS), scanning transmission electron microscopy–electron energy loss spectroscopy (STEM–EELS), and high-angle annular dark-field (HAADF) STEM, and modeled the Ni-rich NCM surface using density functional theory (DFT). We verified that the phase changes continuously rather than discretely from the surface into the bulk through cation mixing. Our results suggest that the thickness of the phase-change region at the surface causes the battery performance to suddenly degrade at a certain value. We found that the deterioration in cell performance is mainly due to increasing diffusion resistance in the positive electrode. A 10–25 nm cation mixing layer was observed at the cathode surface after 300 cycles, and this surface layer thickened with increasing charging voltage. Further, simulations revealed that the cathode surface spontaneously evolves oxygen at higher electrochemical potentials. © 2021 | - |
dc.language | 영어 | - |
dc.language.iso | en | - |
dc.publisher | ELSEVIER | - |
dc.relation.isPartOf | Journal of Power Sources | - |
dc.title | Revealing the structural degradation mechanism of the Ni-rich cathode surface: How thick is the surface? | - |
dc.type | Article | - |
dc.type.rims | ART | - |
dc.description.journalClass | 1 | - |
dc.identifier.wosid | 000621173200005 | - |
dc.identifier.doi | 10.1016/j.jpowsour.2021.229542 | - |
dc.identifier.bibliographicCitation | Journal of Power Sources, v.490 | - |
dc.description.isOpenAccess | N | - |
dc.identifier.scopusid | 2-s2.0-85100059137 | - |
dc.citation.title | Journal of Power Sources | - |
dc.citation.volume | 490 | - |
dc.contributor.affiliatedAuthor | Park, Kwangjin | - |
dc.type.docType | Article | - |
dc.subject.keywordAuthor | Cathode surface | - |
dc.subject.keywordAuthor | Lithium nickel cobalt manganese oxide (NCM) | - |
dc.subject.keywordAuthor | Lithium-ion battery | - |
dc.subject.keywordAuthor | Phase transformation | - |
dc.subject.keywordAuthor | STEM–EELS–HAADF | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.
1342, Seongnam-daero, Sujeong-gu, Seongnam-si, Gyeonggi-do, Republic of Korea(13120)031-750-5114
COPYRIGHT 2020 Gachon University All Rights Reserved.
Certain data included herein are derived from the © Web of Science of Clarivate Analytics. All rights reserved.
You may not copy or re-distribute this material in whole or in part without the prior written consent of Clarivate Analytics.