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Herein, investigations of the delithiation and the re\u2010lithiation processes in Al thin films using an established operando light microscopic platform are pursued. Operando videos highlight that the extraction of Li from the \u03b2 phase (LiAl) is accompanied by fracture and crack formation leading to the detachment of the \u03b1 phase (Al) from the rest of the electrode. The evolution of mechanical stress in Al thin film electrodes is tracked and shows severe stress asymmetry as phase transformations progress. Combining with the observations from light and electron microscopy, the mechanical stress during dealloying can be explained by Li solubility with the \u03b2 phase, formation of cracks and of a highly porous Al nanostructure. Although the results pave a difficult path for utilization of the Al\/LiAl\/Al (\u03b1\/\u03b2\/\u03b1) phase transformations in future LIBs, they also suggest excellent opportunities when structural changes can be prevented, which otherwise impact the stability of Al\u2010based electrodes.<\/jats:p>","DOI":"10.1002\/cssc.202002023","type":"journal-article","created":{"date-parts":[[2020,10,5]],"date-time":"2020-10-05T01:14:17Z","timestamp":1601860457000},"page":"5910-5920","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Exploring the Reversibility of Phase Transformations in Aluminum Anodes through Operando Light Microscopy and Stress Analysis"],"prefix":"10.1002","volume":"13","author":[{"given":"Tianye","family":"Zheng","sequence":"first","affiliation":[{"name":"Department of Electrical Engineering The Hong Kong Polytechnic University  Hung Hom, Kowloon Hong Kong P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dominik","family":"Kramer","sequence":"additional","affiliation":[{"name":"Institute for Applied Materials Karlsruhe Institute of Technology (KIT)  76344 Eggenstein-Leopoldshafen Germany"},{"name":"Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU)  89069 Ulm Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohammad H.","family":"Tahmasebi","sequence":"additional","affiliation":[{"name":"Department of Chemistry Dalhousie University  Halifax NS B3H 4R2 Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reiner","family":"M\u00f6nig","sequence":"additional","affiliation":[{"name":"Institute for Applied Materials Karlsruhe Institute of Technology (KIT)  76344 Eggenstein-Leopoldshafen Germany"},{"name":"Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU)  89069 Ulm Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steven T.","family":"Boles","sequence":"additional","affiliation":[{"name":"Department of Electrical Engineering The Hong Kong Polytechnic University  Hung Hom, Kowloon Hong Kong P. 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