Browsing by Subject "Lithium-ion battery electrolyte"

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    X-ray Raman spectroscopy of lithium-ion battery electrolyte solutions in a flow cell
    (Wiley-Blackwell, 2018) Ketenoglu, D.; Spiekermann, G.; Harder, M.; Oz, E.; Koz, C.; Yagci, M. C.; Yilmaz, E.; Yin, Z.; Sahle, C. J.; Detlefs, B.; Yavaş, H.
    The effects of varying LiPF6 salt concentration and the presence of lithium bis(oxalate)borate additive on the electronic structure of commonly used lithium-ion battery electrolyte solvents (ethylene carbonate-dimethyl carbonate and propylene carbonate) have been investigated. X-ray Raman scattering spectroscopy (a non-resonant inelastic X-ray scattering method) was utilized together with a closed-circle flow cell. Carbon and oxygen K-edges provide characteristic information on the electronic structure of the electrolyte solutions, which are sensitive to local chemistry. Higher Li+ ion concentration in the solvent manifests itself as a blue-shift of both the π∗ feature in the carbon edge and the carbonyl π∗ feature in the oxygen edge. While these oxygen K-edge results agree with previous soft X-ray absorption studies on LiBF4 salt concentration in propylene carbonate, carbon K-edge spectra reveal a shift in energy, which can be explained with differing ionic conductivities of the electrolyte solutions.Electronic structures of commonly used lithium-ion battery electrolyte solutions measured by non-resonant inelastic X-ray scattering method are presented.