 |
Portail HAL - Université de Lille |  |
Article dans une revue
Ag4V2O6F2 (SVOF): A High Silver Density Phase and Potential New Cathode Material for Implantable Cardioverter Defibrillators
Abstract : The electrochemical reactivity of the cathode material Ag4V2O6F2 (SVOF) versus lithium, with a particular emphasis on the lithium insertion mechanism, was studied by means of the complementary techniques in situ X-ray diffraction, electron paramagnetic resonance, and high-resolution transmisssion electron microscopy. This study confirms the initial reports of a high capacity for SVOF of 148 mAh/g above 3 V and that the reduction of silver above 3 V (vs Li+/Li0) leads to a loss of SVOF crystallinity until it becomes completely amorphous between the third and fourth lithiums inserted. Next, vanadium is reduced between 2.5 and 1.5 V (vs Li+/Li0) for the fifth and sixth lithiums inserted. In addition, the polarization within the cathode is significantly lower for the vanadium reduction than for the silver reduction. The silver metal morphologies consisted of nanoparticles (∼5 nm diameter) and dendrites and were both seen in samples of lithiated SVOF.
https://hal.univ-lille.fr/hal-03373715
Contributeur : Lilloa Université de Lille Connectez-vous pour contacter le contributeur
Soumis le : lundi 11 octobre 2021 - 16:08:27
Dernière modification le : mardi 12 octobre 2021 - 03:35:18
Contributeur : Lilloa Université de Lille Connectez-vous pour contacter le contributeur
Soumis le : lundi 11 octobre 2021 - 16:08:27
Dernière modification le : mardi 12 octobre 2021 - 03:35:18
Lien texte intégral
