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In Situ Electrochemical Zn2+-Doping for Mn-Rich Layered Oxides in Li-Ion Batteries

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dc.contributor.authorChoi, Aram-
dc.contributor.authorLim, Jungwoo-
dc.contributor.authorKim, Hanseul-
dc.contributor.authorDoo, Sung Wook-
dc.contributor.authorLee, Kyu Tae-
dc.date.accessioned2021-01-31T08:09:25Z-
dc.date.available2021-01-31T08:09:25Z-
dc.date.created2019-12-04-
dc.date.created2019-12-04-
dc.date.issued2019-05-
dc.identifier.citationACS Applied Energy Materials, Vol.2 No.5, pp.3427-3434-
dc.identifier.issn2574-0962-
dc.identifier.other87682-
dc.identifier.urihttps://hdl.handle.net/10371/171854-
dc.description.abstractMn-rich layered oxide materials have been considered as promising cathode materials for large scale Li-ion batteries because Mn is more inexpensive than Co and Ni. In this connection, a variety of doped-materials have been examined to improve the electrochemical performance of Mn-rich cathode materials. Doped-materials are conventionally synthesized using solid state synthesis at high temperatures, where most dopants are located at transition metal sites. The amount of redox-active transition metals decreases with increasing the amount of dopants in transition metals sites, resulting in the reduced reversible capacity of doped-materials. This paper demonstrates an in situ electrochemical doping of Zn2+ that is site-selective. Li+ at Li sites in Mn-rich layered oxides is selectively replaced by Zn2+ during cycling. Zn2+ ions in electrolytes are irreversibly inserted to Li sites in delithiated Mn-rich cathode materials during discharge, leading to the formation of Zn2+-doped Mn-rich layered oxides, [Li1-xZny] [Mn1-xMz]O-2 (M = Ni and Co). In contrast to conventional doped-materials, Zn2+ dopants at Li sites do not reduce the reversible capacity of Mn-rich oxide materials. Zn2+ at the Li sites diminishes both cation disorder and electrolyte decomposition during cycling, leading to the improved capacity retention over 100 cycles. In addition, the Zn2+ intercalation is dependent on the amount of Mn in layered oxides and, thereby, only available for Mn-rich cathode materials. Moreover, the in situ electrochemical Zn2+-doping is facile and practical in the aspect of processability, because this only requires an electrolyte additive, such as Zn(TFSI)(2).-
dc.language영어-
dc.publisherAmerican Chemical Society-
dc.titleIn Situ Electrochemical Zn2+-Doping for Mn-Rich Layered Oxides in Li-Ion Batteries-
dc.typeArticle-
dc.contributor.AlternativeAuthor이규태-
dc.identifier.doi10.1021/acsaem.9b00241-
dc.citation.journaltitleACS Applied Energy Materials-
dc.identifier.wosid000469885300050-
dc.identifier.scopusid2-s2.0-85065789647-
dc.citation.endpage3434-
dc.citation.number5-
dc.citation.startpage3427-
dc.citation.volume2-
dc.identifier.sci000469885300050-
dc.description.isOpenAccessN-
dc.contributor.affiliatedAuthorLee, Kyu Tae-
dc.type.docTypeArticle-
dc.description.journalClass1-
dc.subject.keywordPlusPOSITIVE ELECTRODE MATERIALS-
dc.subject.keywordPlusVOLTAGE DECAY-
dc.subject.keywordPlusLITHIUM-
dc.subject.keywordPlusCAPACITY-
dc.subject.keywordPlusCATHODES-
dc.subject.keywordPlusCHEMISTRY-
dc.subject.keywordPlusPERFORMANCE-
dc.subject.keywordAuthorelectrochemical doping-
dc.subject.keywordAuthorlithium ion battery-
dc.subject.keywordAuthorMn-rich layered oxide-
dc.subject.keywordAuthorcathode-
dc.subject.keywordAuthorzinc doping-
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Lee, Kyu Tae이규태
Associate Professor
  • College of Engineering
  • School of Chemical and Biological Engineering
Research Area Electrochemical Engineering, Rechargeable Battery

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