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Self-discharge mechanism of high-voltage KVPO4F for K-ion batteries

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierInstitut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM]
hal.structure.identifierRéseau sur le stockage électrochimique de l'énergie [RS2E]
dc.contributor.authorWERNERT, Romain
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierInstitut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM]
hal.structure.identifierRéseau sur le stockage électrochimique de l'énergie [RS2E]
dc.contributor.authorNGUYEN, Long H.B.
hal.structure.identifierRéseau sur le stockage électrochimique de l'énergie [RS2E]
dc.contributor.authorIADECOLA, Antonella
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierAdvanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]
hal.structure.identifierRéseau sur le stockage électrochimique de l'énergie [RS2E]
dc.contributor.authorWEILL, François
hal.structure.identifierCELLS ALBA synchroton = ALBA Synchrotron [CELLS ALBA]
dc.contributor.authorFAUTH, François
hal.structure.identifierInstitut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM]
hal.structure.identifierAdvanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]
hal.structure.identifierRéseau sur le stockage électrochimique de l'énergie [RS2E]
dc.contributor.authorMONCONDUIT, Laure
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierAdvanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]
hal.structure.identifierRéseau sur le stockage électrochimique de l'énergie [RS2E]
dc.contributor.authorCARLIER, Dany
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierAdvanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]
hal.structure.identifierRéseau sur le stockage électrochimique de l'énergie [RS2E]
dc.contributor.authorCROGUENNEC, Laurence
dc.date.issued2022
dc.identifier.issn2574-0962
dc.description.abstractEnCurrent performances of Li-, Na-, or K-ion batteries are mainly limited by the specific capacity of the positive electrode. Therefore, it is important to reach the highest capacity possible for a given electrode material. Here, we investigate the performance limitation of KVPO4F, a prospective material for K-ion batteries, which can deliver only 80% of its theoretical capacity. We discover that the capacity limitation of KVPO4F is related to a kinetic competition between K+ deinsertion and side reactions ascribed to the electrolyte degradation at high potentials. Homeotypic VPO4F can be obtained from KVPO4F through a chemical deintercalation process, which disproves a possible structural limitation or instability. The deintercalated compound was characterized by electron and X-ray diffraction, X-ray absorption spectroscopy, and nuclear magnetic resonance spectroscopy. Despite the structural stability, a spontaneous reaction occurs between the deintercalated KxVPO4F (x < 0.5) and the electrolyte (0.8 M KPF6 in ethylene carbonate/diethylene carbonate), with an electron transfer to vanadium compensated by K+ intercalation. This reaction leads to self-discharge until the open circuit potential is lower than 4.7 V versus K+/K, corresponding to the K0.5VPO4F composition.
dc.description.sponsorshipVers des batteries innovantes K-ion - ANR-19-CE05-0026
dc.description.sponsorshipLaboratory of excellency for electrochemical energy storage
dc.language.isoen
dc.publisherACS
dc.subject.enVanadium phosphate fluoride
dc.subject.enPotassium-ion battery
dc.subject.enChemical deintercalation
dc.subject.enSelf-discharge mechanism
dc.subject.enSide reactions
dc.title.enSelf-discharge mechanism of high-voltage KVPO4F for K-ion batteries
dc.typeArticle de revue
dc.identifier.doi10.1021/acsaem.2c02379
dc.subject.halChimie/Matériaux
bordeaux.journalACS Applied Energy Materials
bordeaux.page14913–14921
bordeaux.volume5
bordeaux.issue12
bordeaux.peerReviewedoui
hal.identifierhal-03857373
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03857373v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=ACS%20Applied%20Energy%20Materials&amp;rft.date=2022&amp;rft.volume=5&amp;rft.issue=12&amp;rft.spage=14913%E2%80%9314921&amp;rft.epage=14913%E2%80%9314921&amp;rft.eissn=2574-0962&amp;rft.issn=2574-0962&amp;rft.au=WERNERT,%20Romain&amp;NGUYEN,%20Long%20H.B.&amp;IADECOLA,%20Antonella&amp;WEILL,%20Fran%C3%A7ois&amp;FAUTH,%20Fran%C3%A7ois&amp;rft.genre=article


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