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* Corresponding author 1 UPMC - Université Pierre et Marie Curie - Paris 6 2 CDF - Collège de France 3 LRCS - Laboratoire réactivité et chimie des solides 4 RS2E - Réseau sur le stockage électrochimique de l-énergie 5 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation 6 PSL - PSL Research University 7 LASIR - LAboratoire de Spectrochimie Infrarouge et Raman

Abstract : Batteries for electrical storage are central to any future alternative energy paradigm. The ability to probe the redox mechanisms occurring at electrodes during their operation is essential to improve battery performances. Here we present the first report on Electron Paramagnetic Resonance operando spectroscopy and in situ imaging of a Li-ion battery using Li 2 Ru 0.75 Sn 0.25 O 3 , a high-capacity 4270 mAh g À 1 Li-rich layered oxide, as positive electrode. By monitoring operando the electron paramagnetic resonance signals of Ru 5 þ and paramagnetic oxygen species, we unambiguously prove the formation of reversible O 2 n À species that contribute to their high capacity. In addition, we visualize by imaging with micrometric resolution the plating-stripping of Li at the negative electrode and highlight the zones of nucleation and growth of Ru 5 þ -oxygen species at the positive electrode. This efficient way to locate -electron-related phenomena opens a new area in the field of battery characterization that should enable future breakthroughs in battery research.

Keywords : Materials science Analytical chemistry Chemical sciences





Autor: M Sathiya - J.-B Leriche - E Salager - D Gourier - J.-M Tarascon - H. Vezin -

Fuente: https://hal.archives-ouvertes.fr/



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