Helmholtz Zentrum Berlin für Materialien und Energie GmbH
MXenes are layered two-dimensional materials with outstanding properties for electrochemical energy storage for Li-ion battery. Their pseudocapacitive behavior, possibly enabling high power and energy densities, is partly governed by their rich surface chemistry Tx, constituted of a mixture of OH, O, F and Cl groups, which can be tuned by the etching procedure. However, the local distribution of surface functional groups over single flakes remain unclear. The difference between surface and interlayer chemistry in few- and multi-layered MXene particles is also unknown due to the lack of techniques with the relevant probing depths. In this presentation, I will introduce scanning X-ray microscopy (SXM) with simultaneous transmission and electron yield detection, enabling chemical imaging with bulk and surface sensitivity, respectively, of individual MXene flakes. Post mortem analysis of multi-layered MS-etched Ti3C2Tx electrodes cycled in LP30 (1M LiPF6 in EC/DMC) by SXM at the Ti L- and O K-edge in both modes enables the identification of the chemical fingerprints of the different components of the battery with spatial- and depth-resolutions.
Abstract
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