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Electrochemical redox processes involved in carbon-coated KVPO4F for high voltage K-ion batteries revealed by XPS analysis

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  • معلومة اضافية
    • Contributors:
      Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM); Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS); Réseau sur le stockage électrochimique de l'énergie (RS2E); Université de Nantes (UN)-Aix Marseille Université (AMU)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Collège de France (CdF (institution))-Université de Picardie Jules Verne (UPJV)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP); Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Université de Montpellier (UM)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP); Université de Toulouse (UT)-Université de Toulouse (UT)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP); Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA); Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB); Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS); Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM); Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS); Advanced Lithium Energy Storage Systems - ALISTORE-ERI (ALISTORE-ERI); Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS); The authors thank the financial support of E2S-UPPA, Région Nouvelle Aquitaine and the French National Research Agency (STORE-EX Labex Project ANR-10-LABX-76-01 and TROPIC project ANR-19-CE05-0026-01). The authors thank Cathy DENAGE, Etienne DURAND and Eric LEBRAUD (ICMCB) for their help with SEM, TGA-FTIR and XRD analyses, respectively. Authors also thank Joël GAUBICHER (IMN-Nantes) for fruitful discussions about redox processes in KVPF.; ANR-10-LABX-0076,STORE-EX,Laboratory of excellency for electrochemical energy storage(2010)
    • بيانات النشر:
      CCSD
      Electrochemical Society
    • الموضوع:
      2020
    • Collection:
      Université Grenoble Alpes: HAL
    • نبذة مختصرة :
      International audience ; K-ion batteries need efficient positive electrode materials with open structural frameworks to accommodate the large ionic radius of K +. In that direction, polyanionic compounds are of great interest. Among them, KVPO4F is the most studied one. Its electrochemical redox processes still remain unclear, especially at high voltage. To tackle this issue, X-ray photoelectron spectroscopy was used to reveal the electrochemical redox processes of KxVPO4F. First, a carbon coating was performed and allowed increasing the overall electrochemical performance while mitigating electrolyte degradation at high voltage. Then, XPS analysis showed a high reversibility of the redox processes although the K + extraction (and insertion) from x=0.5 to 0 2 was hindered, possibly by structural constraints while electrolyte degradation occurred mostly above 4.5 V.
    • الرقم المعرف:
      10.1149/1945-7111/abbb0c
    • الدخول الالكتروني :
      https://hal.umontpellier.fr/hal-02982857
      https://hal.umontpellier.fr/hal-02982857v1/document
      https://hal.umontpellier.fr/hal-02982857v1/file/KVPF%20redox%20-%20JES%20-%20Mainok%20-%20revised%20source%20file.pdf
      https://doi.org/10.1149/1945-7111/abbb0c
    • Rights:
      info:eu-repo/semantics/OpenAccess
    • الرقم المعرف:
      edsbas.DA84652D