Show simple item record

dc.contributor.advisorBerger, John R.
dc.contributor.authorMalave, Veruska
dc.date.accessioned2007-01-03T06:28:16Z
dc.date.accessioned2022-02-09T09:03:52Z
dc.date.available2014-11-01T04:18:44Z
dc.date.available2022-02-09T09:03:52Z
dc.date.issued2014
dc.date.submitted2014
dc.identifierT 7535
dc.identifier.urihttps://hdl.handle.net/11124/448
dc.description2014 Spring.
dc.descriptionIncludes illustrations (some color), color maps.
dc.descriptionIncludes bibliographical references (pages 126-133).
dc.description.abstractThe chemo-mechanical response of 3-D reconstructed and idealistic Li[subscript x]CoO[subscript 2] cathode particles has been elucidated with the implementation of an isothermal microscale numerical and analytical solution. The electrode stress-strain state is delineated upon the contribution of: i) phase transformation; ii) anisotropy and crystallographic orientation; iii) Li-composition inhomogeneity; iv) particle morphology and size; and v) composition-dependent chemical-expansion coefficient, [beta]. Diffusion-induced stresses (DIS) can be quite extreme with increasing particle size, Li concentration and discharge rate. Peaks of DIS locally emerge in the vicinity of concave features and protuberances of the anisotropic-elastic actual morphologies. In some cases, the severity of DIS indicate proneness to particle fragmentation. It is shown that phase-transition-induced stresses detrimentally contribute to abrupt changes in the particle mechanical behavior. The strong anisotropic chemo-elastic field induces the evolution of bands of Li-composition, chemical strains, and high-peak stresses. These occurrences are considered to be irrespective of the particle morphology but are highly dependent on the grain crystallographic orientation. Deleterious phase-transformation-induced stress bands are also found within the particle structure and are closely related to bands of chemical-misfit strains. It is demonstrated that [beta] is a key parameter in demarcating the chemo-stress-strain state of the Li[subscript x]CoO[subscript 2] cathode material. Under the linearity of [beta], both the stress-induced diffusion (SID) and DIS are dramatically more affected than when [beta] is constant. Hence, non-linear volumetric changes in the cathode structure can undermine its mechanical integrity. Because the chemo-elastic phenomena emanate in a reciprocate fashion, the linear-[beta]-based hydrostatic-stress gradients significantly facilitate Li diffusion under both charge-and discharge conditions comparing to the classical-Fickian-diffusion case. Subsequently, the stress-decoupling model promotes greater DIS due to composition inhomogeneity.
dc.format.mediumborn digital
dc.format.mediumdoctoral dissertations
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado School of Mines. Arthur Lakes Library
dc.relation.ispartof2010-2019 - Mines Theses & Dissertations
dc.rightsCopyright of the original work is retained by the author.
dc.subjectanisotropy
dc.subjectreconstructed particles
dc.subjectphase transformation
dc.subjectlithium-ion battery
dc.subjectdiffusion-induced stress
dc.subject.lcshLithium ion batteries
dc.subject.lcshAnisotropy
dc.subject.lcshLithium -- Diffusion rate
dc.subject.lcshCathodes
dc.subject.lcshElectrodes
dc.subject.lcshPhase transformations (Statistical physics)
dc.subject.lcshMathematical models
dc.titleChemo-elastic behavior of reconstructed Li-ion battery cathode particles with phase transformation: a numerical and analytical investigation
dc.typeText
dc.contributor.committeememberMustoe, Graham G. W.
dc.contributor.committeememberKee, R. J.
dc.contributor.committeememberMartin, P. A.
dc.contributor.committeememberReimanis, Ivar E. (Ivar Edmund)
dcterms.embargo.terms2014-11-01
dcterms.embargo.expires2014-11-01
thesis.degree.nameDoctor of Philosophy (Ph.D.)
thesis.degree.levelDoctoral
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorColorado School of Mines
dc.rights.access6-month embargo


Files in this item

Thumbnail
Name:
Malave_mines_0052E_10454.pdf
Size:
50.93Mb
Format:
PDF
Description:
Chemo-elastic behavior of ...

This item appears in the following Collection(s)

Show simple item record