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Understanding the high voltage behavior of LiNiO2 through the electrochemical properties of the surface layer

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBAUTISTA QUISBERT, Edgar
hal.structure.identifierALBA Synchrotron light source [Barcelone]
dc.contributor.authorFAUTH, François
hal.structure.identifierSkolkovo Institute of Science and Technology [Moscow] [Skoltech]
dc.contributor.authorABAKUMOV, Artem
dc.contributor.authorBLANGERO, Maxime
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGUIGNARD, Marie
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDELMAS, Claude
dc.date.issued2023
dc.identifier.issn1613-6810
dc.description.abstractEnNickel-rich layered oxides are adopted as electrode materials for EV's. They suffer from a capacity loss when the cells are charged above 4.15 V versus Li/Li+. Doping and coating can lead to significant improvement in cycling. However, the mechanisms involved at high voltage are not clear. This work is focused on LiNiO2 to overcome the effect of M cations. Galvanostatic intermittent titration technique (GITT) and in situ X-ray diffraction (XRD) experiments are performed at very low rates in various voltage ranges (3.8–4.3 V,). On the “4.2–4.3 V” plateau the R2 phase is transformed simultaneously in R3, R3 with H4 stacking faults and H4. As the charge proceeds above 4.17 V cell polarization increases, hindering Li deintercalation. In discharge, such polarization decreases immediately. Upon cycling, the polarization increases at each charge above 4.17 V. In discharge, the capacity and dQ/dV features below 4.1 V remain constant and unaffected, suggesting that the bulk of the material do not undergo significant structural defect. This study shows that the change in polarization results from the electrochemical behavior of the grain surface having very low conductivity above 4.17 V and high conductivity below this threshold. This new approach can explain the behavior observed with dopants like tungsten.
dc.language.isoen
dc.publisherWiley-VCH Verlag
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/
dc.title.enUnderstanding the high voltage behavior of LiNiO2 through the electrochemical properties of the surface layer
dc.typeArticle de revue
dc.identifier.doi10.1002/smll.202300616
dc.subject.halChimie/Matériaux
bordeaux.journalSmall
bordeaux.page2300616
bordeaux.volume19
bordeaux.issue30
bordeaux.peerReviewedoui
hal.identifierhal-04098551
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04098551v1
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