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dc.contributor.authorLeach, Andrew Stephen
dc.contributor.authorLlewellyn, Alice V
dc.contributor.authorXu, Chao
dc.contributor.authorTan, Chun
dc.contributor.authorHeenan, Thomas MM
dc.contributor.authorDimitrijevic, Alex
dc.contributor.authorKleiner, Karin
dc.contributor.authorGrey, Clare P
dc.contributor.authorBrett, Dan JL
dc.contributor.authorTang, Chiu C
dc.contributor.authorShearing, Paul R
dc.contributor.authorJervis, Rhodri
dc.date.accessioned2022-01-28T16:52:06Z
dc.date.available2022-01-28T16:52:06Z
dc.date.issued2022-01-14
dc.date.submitted2021-10-13
dc.identifier.issn2673-2718
dc.identifier.other794194
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/333386
dc.description.abstract<jats:p>Understanding the performance of commercially relevant cathode materials for lithium-ion (Li-ion) batteries is vital to realize the potential of high-capacity materials for automotive applications. Of particular interest is the spatial variation of crystallographic behavior across (what can be) highly inhomogeneous electrodes. In this work, a high-resolution X-ray diffraction technique was used to obtain operando transmission measurements of Li-ion pouch cells to measure the spatial variances in the cell during electrochemical cycling. Through spatially resolved investigations of the crystallographic structures, the distribution of states of charge has been elucidated. A larger portion of the charging is accounted for by the central parts, with the edges and corners delithiating to a lesser extent for a given average electrode voltage. The cells were cycled to different upper cutoff voltages (4.2 and 4.3 V <jats:italic>vs.</jats:italic> graphite) and C-rates (0.5, 1, and 3C) to study the effect on the structure of the NMC811 cathode. By combining this rapid data collection method with a detailed Rietveld refinement of degraded NMC811, the spatial dependence of the degradation caused by long-term cycling (900 cycles) has also been shown. The variance shown in the pristine measurements is exaggerated in the aged cells with the edges and corners offering an even lower percentage of the charge. Measurements collected at the very edge of the cell have also highlighted the importance of electrode alignment, with a misalignment of less than 0.5 mm leading to significantly reduced electrochemical activity in that area.</jats:p>
dc.languageen
dc.publisherFrontiers Media SA
dc.subjectChemical Engineering
dc.subjectNMC811
dc.subjectLi-ion batteries
dc.subjectoperando XRD
dc.subjectSXRD
dc.subjectoperando electrochemistry
dc.subjectoperando spectroelectrochemistry
dc.subjectbattery degeneration
dc.titleSpatially Resolved Operando Synchrotron-Based X-Ray Diffraction Measurements of Ni-Rich Cathodes for Li-Ion Batteries
dc.typeArticle
dc.date.updated2022-01-28T16:52:05Z
prism.publicationNameFrontiers in Chemical Engineering
prism.volume3
dc.identifier.doi10.17863/CAM.80809
dcterms.dateAccepted2021-11-22
rioxxterms.versionofrecord10.3389/fceng.2021.794194
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.identifier.eissn2673-2718
cam.issuedOnline2022-01-14


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