Solid Electrolyte Interphase Revealing Interfacial Electrochemistry on Highly Oriented Pyrolytic Graphite in a Water-in-Salt Electrolyte

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dc.contributor.authorKim, Yenako
dc.contributor.authorHong, Misunko
dc.contributor.authorOh, Hyunjeongko
dc.contributor.authorKim, Yousooko
dc.contributor.authorSuyama, Hiroshiko
dc.contributor.authorNakanishi, Shinjiko
dc.contributor.authorByon, Hye Ryungko
dc.date.accessioned2021-03-26T01:58:08Z-
dc.date.available2021-03-26T01:58:08Z-
dc.date.created2020-10-26-
dc.date.issued2020-09-
dc.identifier.citationJOURNAL OF PHYSICAL CHEMISTRY C, v.124, no.37, pp.20135 - 20142-
dc.identifier.issn1932-7447-
dc.identifier.urihttp://hdl.handle.net/10203/281885-
dc.description.abstractWe present a fundamental study of solid-electrolyte interphase (SEI) layers toward a better understanding of interfacial electrochemistry. In particular, water-in-salt electrolytes yield SEIs with a simple composition that describes the electrolyte-electrode interface explicitly. The 21 m lithium bis(trifluoromethanesulfonyl)imide formed a porous SEI film on a highly oriented pyrolytic graphite (HOPG) electrode at -2 V (vs Ag/AgCl). The significant hydrogen evolution reaction (HER) made holes in a thin SEI film and defect sites in the HOPG. In addition, the SEI comprised fragmented TFSI without including any Li compounds. We suggested that fragments of TFSI- were precipitated out by the addition of the hydrogen atoms, which were yielded through the Volmer step and detached from the HOPG surface before HER. Subsequently, a nonporous and LiOH-rich film was formed by -4 V. The OH- and Li+ ions were enriched during the continuous HER, and their chemical reaction produced a thick film and nanoneedles. However, there was no evidence of Li+ intercalation into graphitic layers of the HOPG, presumably caused by sluggish Li+-ion transport in the Li-deficient SEI layer. This study shows variable interfacial reactions over a wide range of applied potential and the HER impact on SEI films associated with the performance of aqueous Li-ion batteries.-
dc.languageEnglish-
dc.publisherAMER CHEMICAL SOC-
dc.titleSolid Electrolyte Interphase Revealing Interfacial Electrochemistry on Highly Oriented Pyrolytic Graphite in a Water-in-Salt Electrolyte-
dc.typeArticle-
dc.identifier.wosid000574908200028-
dc.identifier.scopusid2-s2.0-85092114745-
dc.type.rimsART-
dc.citation.volume124-
dc.citation.issue37-
dc.citation.beginningpage20135-
dc.citation.endingpage20142-
dc.citation.publicationnameJOURNAL OF PHYSICAL CHEMISTRY C-
dc.identifier.doi10.1021/acs.jpcc.0c05433-
dc.contributor.localauthorByon, Hye Ryung-
dc.contributor.nonIdAuthorHong, Misun-
dc.contributor.nonIdAuthorKim, Yousoo-
dc.contributor.nonIdAuthorSuyama, Hiroshi-
dc.contributor.nonIdAuthorNakanishi, Shinji-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordPlusWETTABILITY-
dc.subject.keywordPlusXPS-
dc.subject.keywordPlusNANOBUBBLES-
dc.subject.keywordPlusMICROSCOPY-
dc.subject.keywordPlusGRAPHENE-
dc.subject.keywordPlusHYDROGEN-
dc.subject.keywordPlusBEHAVIOR-
dc.subject.keywordPlusINSIGHT-
dc.subject.keywordPlusGROWTH-
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