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In situ electrochemical surface modification for high-voltage LiCoO2 in lithium ion batteries
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lim, Jungwoo | - |
dc.contributor.author | Choi, Aram | - |
dc.contributor.author | Kim, Hanseul | - |
dc.contributor.author | Doo, Sung Wook | - |
dc.contributor.author | Park, Yuwon | - |
dc.contributor.author | Lee, Kyu Tae | - |
dc.date.accessioned | 2021-01-31T08:09:15Z | - |
dc.date.available | 2021-01-31T08:09:15Z | - |
dc.date.created | 2020-02-14 | - |
dc.date.created | 2020-02-14 | - |
dc.date.created | 2020-02-14 | - |
dc.date.issued | 2019-06-30 | - |
dc.identifier.citation | Journal of Power Sources, Vol.426, pp.162-168 | - |
dc.identifier.issn | 0378-7753 | - |
dc.identifier.other | 91237 | - |
dc.identifier.uri | https://hdl.handle.net/10371/171851 | - |
dc.description.abstract | High-voltage LiCoO2 has been revisited to improve the energy density of lithium ion batteries. LiCoO2 can deliver the reversible capacity of about 200 mA h g(-1) when the upper cut-off voltage increases to 4.55 V (vs. Li/Li+). However, the high upper cut-off voltage causes the severe failures of LiCoO2 such as structural degradation, electrolyte decomposition, and Co dissolution. Various surface-modified LiCoO2 materials have been introduced to suppress electrolyte decomposition and Co dissolution, thereby leading to the improved electrochemical performance. Most of the coated LiCoO2 materials are obtained through a conventional coating process such as sol-gel synthesis, which is complex and high-cost. In this paper, the in situ electrochemical coating method is introduced as a simple and low-cost coating process, where the electrolyte additive of Mg salts is electrochemically decomposed to form a MgF2-based coating layer on the LiCoO2 surface. LiCoO2 electrochemically coated with MgF2 suppresses Co dissolution in electrolytes, resulting in excellent electrochemical performance such as high reversible capacity of 198 mA h g(-1) and stable cycle performance over 100 cycles in the voltage range between 3 and 4.55 V (vs. Li/Li+) at 45 degrees C. The formation mechanism of MgF2 is also demonstrated through ex situ XPS and XANES analyses. | - |
dc.language | 영어 | - |
dc.publisher | Elsevier BV | - |
dc.title | In situ electrochemical surface modification for high-voltage LiCoO2 in lithium ion batteries | - |
dc.type | Article | - |
dc.contributor.AlternativeAuthor | 이규태 | - |
dc.identifier.doi | 10.1016/j.jpowsour.2019.04.011 | - |
dc.citation.journaltitle | Journal of Power Sources | - |
dc.identifier.wosid | 000468250400022 | - |
dc.identifier.scopusid | 2-s2.0-85064214849 | - |
dc.citation.endpage | 168 | - |
dc.citation.startpage | 162 | - |
dc.citation.volume | 426 | - |
dc.identifier.sci | 000468250400022 | - |
dc.description.isOpenAccess | N | - |
dc.contributor.affiliatedAuthor | Lee, Kyu Tae | - |
dc.type.docType | Article; Proceedings Paper | - |
dc.description.journalClass | 1 | - |
dc.subject.keywordPlus | CATHODE MATERIALS | - |
dc.subject.keywordPlus | LI-O-2 BATTERIES | - |
dc.subject.keywordPlus | DOPED LICOO2 | - |
dc.subject.keywordPlus | PERFORMANCE | - |
dc.subject.keywordPlus | DEGRADATION | - |
dc.subject.keywordPlus | STABILITY | - |
dc.subject.keywordPlus | MECHANISM | - |
dc.subject.keywordPlus | ELECTRODE | - |
dc.subject.keywordPlus | CAPACITY | - |
dc.subject.keywordPlus | ALKALI | - |
dc.subject.keywordAuthor | Cathode electrolyte interphase | - |
dc.subject.keywordAuthor | Lithium cobalt oxide | - |
dc.subject.keywordAuthor | Cathode | - |
dc.subject.keywordAuthor | Surface modification | - |
dc.subject.keywordAuthor | Lithium ion batteries | - |
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