X-ray Raman spectroscopy of lithium-ion battery electrolyte solutions in a flow 
cell.

Ketenoglu, D.; Spiekermann, G.; Harder, M.; Oz, E.; Koz, C.; Yagci, M. C.; Yilmaz, E.; Yin, Z.; Sahle, C. J.; Detlefs, B.; Yavas, H.

doi:10.1107/S1600577518001662

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X-ray Raman spectroscopy of lithium-ion battery electrolyte solutions in a flow cell.

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Yin, Z.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for biophysical chemistry, Max Planck Society;

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Citation

Ketenoglu, D., Spiekermann, G., Harder, M., Oz, E., Koz, C., Yagci, M. C., et al. (2018). X-ray Raman spectroscopy of lithium-ion battery electrolyte solutions in a flow cell. Journal of Synchrotron Radiation, 25(2), 537-542. doi:10.1107/S1600577518001662.

Cite as: https://hdl.handle.net/21.11116/0000-0000-D5FC-4

Abstract

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 pi* feature in the carbon edge and the carbonyl pi* 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.