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Enhanced performance of KVPO4F0.5O0.5 in potassium batteries by carbon coating interfaces

hal.structure.identifierInstitut de Science des Matériaux de Mulhouse [IS2M]
dc.contributor.authorLARBI, Louiza
hal.structure.identifierInstitut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier [ICGM]
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierRéseau sur le stockage électrochimique de l'énergie [RS2E]
dc.contributor.authorWERNERT, Romain
hal.structure.identifierInstitut de Science des Matériaux de Mulhouse [IS2M]
dc.contributor.authorFIOUX, Philippe
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierRéseau sur le stockage électrochimique de l'énergie [RS2E]
hal.structure.identifierAdvanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]
dc.contributor.authorCROGUENNEC, Laurence
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]
hal.structure.identifierAdvanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]
dc.contributor.authorMONCONDUIT, Laure
hal.structure.identifierInstitut de Science des Matériaux de Mulhouse [IS2M]
hal.structure.identifierRéseau sur le stockage électrochimique de l'énergie [RS2E]
dc.contributor.authorMATEI GHIMBEU, Camelia
dc.date.issued2023
dc.identifier.issn1944-8244
dc.description.abstractEnPotassium vanadium oxyfluoride phosphate of composition KVPO4F0.5O0.5 was modified by a carbon coating to enhance its electrochemical performance. Two distinct methods were used, first, chemical vapor deposition (CVD) using acetylene gas as a carbon precursor and second, an aqueous route using an abundant, cheap, and green precursor (chitosan) followed by a pyrolysis step. The formation of a 5 to 7 nm-thick carbon coating was confirmed by transmission electron microscopy and it was found to be more homogeneous in the case of CVD using acetylene gas. Indeed, an increase of the specific surface area of one order of magnitude, low content of C sp2, and residual oxygen surface functionalities were observed when the coating was obtained using chitosan. Pristine and carbon-coated materials were compared as positive electrode materials in potassium half-cells cycled at a C/5 (C = 26.5 mA g–1) rate within a potential window of 3 to 5 V vs K+/K. The formation by CVD of a uniform carbon coating with the limited presence of surface functions was shown to improve the initial coulombic efficiency up to 87% for KVPFO4F0.5O0.5-C2H2 and to mitigate electrolyte decomposition. Thus, performance at high C-rates such as 10 C was significantly improved, with ∼50% of the initial capacity maintained after 10 cycles, whereas a fast capacity loss is observed for the pristine material.
dc.description.sponsorshipVers des batteries innovantes K-ion - ANR-19-CE05-0026
dc.description.sponsorshipLaboratory of excellency for electrochemical energy storage - ANR-10-LABX-0076
dc.language.isoen
dc.publisherWashington, D.C. : American Chemical Society
dc.subject.enCarbon coating
dc.subject.enChemical vapor deposition
dc.subject.enChitosan biopolymer
dc.subject.enPositive electrode material
dc.subject.enVanadium oxyfluoride phosphate
dc.subject.enPotassium-ion batteries
dc.title.enEnhanced performance of KVPO4F0.5O0.5 in potassium batteries by carbon coating interfaces
dc.typeArticle de revue
dc.identifier.doi10.1021/acsami.3c01240
dc.subject.halChimie/Matériaux
dc.subject.halChimie/Autre
bordeaux.journalACS Applied Materials & Interfaces
bordeaux.page18992-19001
bordeaux.volume15
bordeaux.issue15
bordeaux.peerReviewedoui
hal.identifierhal-04088055
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04088055v1
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