X-ray Raman spectroscopy of lithium-ion battery electrolyte solutions in a flow cell
Embargo Lift Date: 2019-01-28
Yagci, M. C.
Sahle, C. J.
Journal of Synchrotron Radiation
537 - 542
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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.
KeywordsC and O K-edge spectra
Lithium-ion battery electrolyte
Non-resonant inelastic X-ray scattering