INVESTIGADORES
GAVILÁN ARRIAZU Edgardo Maximiliano
artículos
Título:
Sodiation of hard carbon: how separating enthalpy and entropy contributions can find transitions hidden in the voltage profile
Autor/es:
MERCER, M. P.; AFFLECK, S.; GAVILÁN-ARRIAZU, E. M.; ZÜLKE, A. A.; MAUGHAN, P. A.; TRIVEDI, S.; FICHTERN, M.; MUNNANGI, A. R. ; LEIVA, E.P.M.; HOSTER, H. E.
Revista:
Chemphyschem
Editorial:
WILEY-V C H VERLAG GMBH
Referencias:
Lugar: Weinheim; Año: 2021
ISSN:
1439-4235
Resumen:
Sodium-ion batteries (NIBs) utilise cheaper materials than lithium-ion batteries (LIBs), and can thus be used in larger scale applications. The preferred anode material is hard carbon, because sodium cannot be inserted into graphite. We apply experimental entropy proling (EP), where the cell temperature is changed under open circuit conditions. EP has been used to characterise LIBs; here, we demonstrate the first application of EP to any NIB material. The voltage versus sodiation fraction curves (voltage proles) of hard carbon lack clear features, consisting only of a slope and a plateau, making it dicult to clarify the structural features of hard carbon that could optimise cell performance. We find additional features through EP that are masked in the voltage proles.
