56 research outputs found
Unlocking the potential of weberite-type metal fluorides in electrochemical energy storage
Sodium-ion batteries (NIBs) are a front-runner among the alternative battery technologies suggested for substituting the state-of-the-art lithium-ion batteries (LIBs). The specific energy of Na-ion batteries is significantly lower than that of LIBs, which is mainly due to the lower operating potentials and higher molecular weight of sodium insertion cathode materials. To compete with the high energy density of LIBs, high voltage cathode materials are required for NIBs. Here we report a theoretical investigation on weberite-type sodium metal fluorides (SMFs), a new class of high voltage and high energy density materials which are so far unexplored as cathode materials for NIBs. The weberite structure type is highly favorable for sodium-containing transition metal fluorides, with a large variety of transition metal combinations (M, M’) adopting the corresponding Na2MM’F7 structure. A series of known and hypothetical compounds with weberite-type structure were computationally investigated to evaluate their potential as cathode materials for NIBs. Weberite-type SMFs show two-dimensional pathways for Na+ diffusion with surprisingly low activation barriers. The high energy density combined with low diffusion barriers for Na+ makes this type of compounds promising candidates for cathode materials in NIBs
Primärstabilität von 2 OSG Prothesen und Methodenschilderung mit vorläufigem Ergebnis
Die hintere und distale Referenzierung führt zu unnatürlichen Abweichungen im Femoropatellargelenk
Experimental investigations of metal-on-metal couplings and their relevance for expected in vivo behaviour
First In-Pile Experimental Results of High-Plutonium-Content Oxide Fuel for Plutonium Burning in Fast Reactor.
Abstract not availableJRC.E-Institute for Transuranium Elements (Karlsruhe
Überraschende Ergebnisse beim Vergleich der Primärästabilität von konischen und sphärischen Schraubpfannen in der Hüftendoprothetik
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