International audienceThis paper proposes a molecular grafting approach as a way to modify the interfacial chemical reactivity of oxide materials, which is detrimental to their long-term energy storage properties. The present study demonstrates that diazonium chemistry offers an efficient path to graft molecules at the surface of a powder oxide material. Indeed, surface derivatization of Li1.1V3O8 nanograins was accomplished by in situ electrografting of a diazonium salt during Li-ion intercalation. The results show that aryl molecules are strongly bonded to the surface forming an organic multilayer the thickness of which can be modulated. Based on TEM, XPS and electrochemical probing of the surface reactivity, the results demonstrate the interest of the proposed surface modifications as a way to tailor both electrochemical and chemical reactivities of oxide electrode materials. Interestingly, charge transfer at the surface of the material is not impeded, while electrolyte decomposition is inhibited. It is anticipated that molecular derivatization of electrode surfaces is a new research direction which will be developed in the field of battery science in the near future, in order to prevent targeted side reactions occurring at different steps of battery manufacturing and use, such as storage, electrode processing, simple contact with electrolyte, and cycling
Confrontée à la nécessité de pacifier le climat social, de trouver les voies et moyens d’une gestion robuste d’effectifs importants, de répondre à un souci d’égalitarisme poussé et à la volonté d’adopter la règle du «mieux disant, la DGFiP a été amenée à reproduire un «modèle» RH caractérisé par une forte centralisation et une approche très administrative. Elle est en train de transformer son «modèle RH» pour rebâtir une gestion RH plus transparente, plus ouverte, davantage tournée vers l’humain et plus responsabilisante avec l’ambition de faire de la gestion des ressources humaines un facilitateur, capable de fonder un «pacte social» empreint de confiance et de responsabilité.
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