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dc.contributor.advisorSteingart, Daniel Aen_US
dc.contributor.authorBhadra, Shohamen_US
dc.contributor.otherElectrical Engineering Departmenten_US
dc.date.accessioned2015-12-07T19:56:01Z-
dc.date.available2015-12-30T06:11:56Z-
dc.date.issued2015en_US
dc.identifier.urihttp://arks.princeton.edu/ark:/88435/dsp01s7526f810-
dc.description.abstractBatteries are a ubiquitous form of electrochemical energy storage, but thus far the methods for measuring the mechanical properties of batteries and their component materials in operando have lagged far behind the methods for measuring the corresponding electrical properties. In this thesis, I demonstrate methods for determining the changes in materials properties of an electrochemical energy storage cell both ex situ and in operando. I begin by establishing the impact of micro-scale morphology changes on the macro-scale dynamic mechanical response in commercial alkaline AA cells. Using a bounce test, the coefficient of restitution (COR) of the cell is shown to increase non-linearly as a function of state of charge (SOC). I show that the reason for the increase in the COR stems from the spatially-dependent oxidation of the Zn anode, with an initial increase corresponding to the formation of a percolation pathway of ZnO-clad Zn particles spanning the radius of the anode. The subsequent saturation of the COR is shown to result from the ultimate solidication and desiccation of the Zn anode. Building from this, I present a generalized in operando solution for materials characterization in batteries using ultrasonic interrogation. The materials properties of battery components change during charge and discharge, resulting in a change in the sound speed of the materials. By attaching transducers to a battery during cycling and sending ultrasonic pulses through each cell I observe the changes in the time of flight (ToF) of the pulses, both in reflection and transmission. I show that the changes in ToF correspond to both SOC and state of health (SOH) in a variety of battery chemistries and geometries, and detail a corresponding acoustic conservation law model framework. Finally, I perform these electrochemical acoustic time of flight (EAToF) experiments on commercial alkaline AA cells. By correlating the results with energy dispersive x-ray diffraction (EDXRD) data and previous bounce test data, I show that EAToF is capable of determining the morphology changes in the anode due to oxidation and solidication during discharge. I also show that using EAToF, the materials quality differences between multiple AA battery brands can be determined.en_US
dc.language.isoenen_US
dc.publisherPrinceton, NJ : Princeton Universityen_US
dc.relation.isformatofThe Mudd Manuscript Library retains one bound copy of each dissertation. Search for these copies in the library's main catalog: http://catalog.princeton.edu/en_US
dc.subjectBatteriesen_US
dc.subjectMechanical characterizationen_US
dc.subjectNondestructive testingen_US
dc.subjectUltrasounden_US
dc.subject.classificationEnergyen_US
dc.subject.classificationMaterials Scienceen_US
dc.titleMethods for Characterization of Batteries Using Acoustic Interrogationen_US
dc.typeAcademic dissertations (Ph.D.)en_US
pu.projectgrantnumber690-2143en_US
pu.embargo.terms2015-12-30en_US
Appears in Collections:Electrical Engineering

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