Diffusional lithium trapping as a failure mechanism of aluminum foil anodes in lithium-ion batteries

dc.contributor.advisorManthiram, Arumugam
dc.creatorCrowley, Patrick Joseph
dc.creator.orcid0000-0002-0555-0402
dc.date.accessioned2023-02-17T18:51:19Z
dc.date.available2023-02-17T18:51:19Z
dc.date.created2022-08
dc.date.issued2022-07-29
dc.date.submittedAugust 2022
dc.date.updated2023-02-17T18:51:21Z
dc.description.abstractAluminum foils are an appealing anode for lithium-ion batteries due to their high capacity and low-cost, but their viability has been limited due to poor cyclability arising from pulverization and solid-electrolyte interphase growth. We show in this thesis that significant capacity degradation of aluminum foil anodes during electrochemical cycling also occurs due to diffusional lithium trapping. Scanning electron microscopy of cross-sectioned, cycled foils in the delithiated state reveals large regions of β-LiAl that are passivated by a surface layer of ⍺-Al, which has poor Li⁺ diffusivity. It is found that lithium diffusion occurs preferentially along the β-LiAl grain boundaries, so the grain structure after initial lithiation significantly affects the trapping behavior. Diffusional lithium trapping is exacerbated by both higher delithiation rates and higher areal capacity, presenting a challenge towards commercialization of aluminum foil anodes. We further demonstrate that diffusional trapping in aluminum foil anodes can be mitigated through alloy design, with the addition of 2 - 3 wt.% Li yielding improved first cycle efficiency, and the addition of 1 wt.% Si yielding improved cycle life. These results provide a mechanistic understanding of diffusional lithium trapping in aluminum foil anodes and highlight compositional design of alloys as a promising strategy to overcome it.
dc.description.departmentMaterials Science and Engineering
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/2152/117492
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/44372
dc.language.isoen
dc.subjectSustainable energy
dc.subjectElectrochemistry
dc.subjectLithium-ion batteries
dc.subjectAlloy anodes
dc.subjectAluminum foil anodes
dc.titleDiffusional lithium trapping as a failure mechanism of aluminum foil anodes in lithium-ion batteries
dc.typeThesis
dc.type.materialtext
thesis.degree.departmentMaterials Science and Engineering
thesis.degree.disciplineMaterials Science and Engineering
thesis.degree.grantorThe University of Texas at Austin
thesis.degree.levelMasters
thesis.degree.nameMaster of Science in Engineering

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