There are no files associated with this item.
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.citation.endPage | 2119 | - |
dc.citation.number | 3 | - |
dc.citation.startPage | 2111 | - |
dc.citation.title | NANO LETTERS | - |
dc.citation.volume | 15 | - |
dc.contributor.author | Kim, Hyejung | - |
dc.contributor.author | Kim, Min Gyu | - |
dc.contributor.author | Jeong, Hu Young | - |
dc.contributor.author | Nam, Haisol | - |
dc.contributor.author | Cho, Jaephil | - |
dc.date.accessioned | 2023-12-22T01:37:46Z | - |
dc.date.available | 2023-12-22T01:37:46Z | - |
dc.date.created | 2015-04-01 | - |
dc.date.issued | 2015-03 | - |
dc.description.abstract | Structural degradation of Ni-rich cathode materials (LiNixM1-xO2; M = Mn, Co, and Al; x > 0.5) during cycling at both high voltage (>4.3 V) and high temperature (>50 degrees C) led to the continuous generation of microcracks in a secondary particle that consisted of aggregated micrometer-sized primary particles. These microcracks caused deterioration of the electrochemical properties by disconnecting the electrical pathway between the primary particles and creating thermal instability owing to oxygen evolution during phase transformation. Here, we report a new concept to overcome those problems of the Ni-rich cathode material via nanoscale surface treatment of the primary particles. The resultant primary particles surfaces had a higher cobalt content and a cation-mixing phase (Fm (3) over barm) with nanoscale thickness in the LiNi0.6Co0.2Mn0.2O2 cathode, leading to mitigation of the microcracks by suppressing the structural change from a layered to rock-salt phase. Furthermore, the higher oxidation state of Mn4+ at the surface minimized the oxygen evolution at high temperatures. This approach resulted in improved structural and thermal stability in the severe cycling-test environment at 60 degrees C between 3.0 and 4.45 V and at elevated temperatures, showing a rate capability that was comparable to that of the pristine sample. | - |
dc.identifier.bibliographicCitation | NANO LETTERS, v.15, no.3, pp.2111 - 2119 | - |
dc.identifier.doi | 10.1021/acs.nanolett.5b00045 | - |
dc.identifier.issn | 1530-6984 | - |
dc.identifier.scopusid | 2-s2.0-85103305605 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/11149 | - |
dc.identifier.url | http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.5b00045 | - |
dc.identifier.wosid | 000351188000102 | - |
dc.language | 영어 | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | A new coating method for alleviating surface degradation of LiNi0.6Co0.2Mn0.2O2 cathode material: Nanoscale surface treatment of primary particles | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter | - |
dc.relation.journalResearchArea | Chemistry; Science & Technology - Other Topics; Materials Science; Physics | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordAuthor | high voltage | - |
dc.subject.keywordAuthor | LiNi0.6Co0.2Mn0.2O2 cathode | - |
dc.subject.keywordAuthor | microcrack | - |
dc.subject.keywordAuthor | primary particles | - |
dc.subject.keywordAuthor | structural degradation | - |
dc.subject.keywordAuthor | thermal stability | - |
dc.subject.keywordPlus | ENERGY-LOSS SPECTROSCOPY | - |
dc.subject.keywordPlus | LITHIUM-ION BATTERIES | - |
dc.subject.keywordPlus | ELECTRON-MICROSCOPY | - |
dc.subject.keywordPlus | OXIDES | - |
dc.subject.keywordPlus | LAYER | - |
Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Tel : 052-217-1404 / Email : scholarworks@unist.ac.kr
Copyright (c) 2023 by UNIST LIBRARY. All rights reserved.
ScholarWorks@UNIST was established as an OAK Project for the National Library of Korea.