Phase transformation mechanism and stress evolution in Sn anode

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dc.contributor.authorNam, Hyeongyunko
dc.contributor.authorPark, Jae Yeolko
dc.contributor.authorYuk, Jong Minko
dc.contributor.authorHan, Seung Min Janeko
dc.date.accessioned2022-01-04T06:40:15Z-
dc.date.available2022-01-04T06:40:15Z-
dc.date.created2022-01-04-
dc.date.created2022-01-04-
dc.date.created2022-01-04-
dc.date.issued2022-03-
dc.identifier.citationENERGY STORAGE MATERIALS, v.45, pp.101 - 109-
dc.identifier.issn2405-8297-
dc.identifier.urihttp://hdl.handle.net/10203/291472-
dc.description.abstractDiffusion-induced stresses in Sn, a promising anode material for Li-ion batteries owing to its high specific capacity, depend significantly on the phase transformation mechanism. In this study, an in-situ X-ray diffraction study is performed to reveal the phase transformation mechanism in Sn as functions of the discharge rate and Sn anode dimensions. In a 500 nm-thick Sn thin-film discharged at C/9 or a 100 nm-thick Sn thin-film discharged at 0.1 C, the Sn phase transforms sequentially to Li2Sn5, followed by β-LiSn and a-Li7Sn3 in three steps, where each step involves reaction-controlled lithiation. However, in a 500 nm-thick Sn thin-film discharged at 2 C or a 2 μm-thick Sn thin-film discharged at 0.1 C, the a-Li7Sn3 phase is directly formed via one-step reaction-controlled lithiation between Sn and a-Li7Sn3. A transition from three-step to one-step results in a steep gradient in the mismatch strain, thereby causing early failure. Finite element simulations show a lower J-integral for the three steps compared with that of a one-step reaction, thereby confirming previously reported experimental observations. For a specified transformation mechanism, the J-integral is lower for smaller Sn micropillars. Therefore, the mechanical reliability of the Sn anode can be enhanced significantly when lithiated under phase transformation mechanism involving three-reaction-controlled lithiations, as well as utilizing a small Sn anode measuring less than 200 nm.-
dc.languageEnglish-
dc.publisherELSEVIER-
dc.titlePhase transformation mechanism and stress evolution in Sn anode-
dc.typeArticle-
dc.identifier.wosid000783179300001-
dc.identifier.scopusid2-s2.0-85120439873-
dc.type.rimsART-
dc.citation.volume45-
dc.citation.beginningpage101-
dc.citation.endingpage109-
dc.citation.publicationnameENERGY STORAGE MATERIALS-
dc.identifier.doi10.1016/j.ensm.2021.11.034-
dc.contributor.localauthorYuk, Jong Min-
dc.contributor.localauthorHan, Seung Min Jane-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorSn anode-
dc.subject.keywordAuthorLi-ion battery-
dc.subject.keywordAuthorPhase transformation-
dc.subject.keywordAuthorC rate-
dc.subject.keywordAuthorLength scale-
dc.subject.keywordAuthorMechanical reliability-
dc.subject.keywordPlusX-RAY-DIFFRACTION-
dc.subject.keywordPlusHIGH-CAPACITY-
dc.subject.keywordPlusLITHIUM-
dc.subject.keywordPlusTIN-
dc.subject.keywordPlusSILICON-
dc.subject.keywordPlusLITHIATION-
dc.subject.keywordPlusNANOCOMPOSITES-
dc.subject.keywordPlusNANOPARTICLES-
dc.subject.keywordPlusDEFORMATION-
dc.subject.keywordPlusELECTRODES-
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