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. , ...Daha Fazla

JOURNAL OF SYNCHROTRON RADIATION, cilt.25, ss.537-542, 2018 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 25
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1107/s1600577518001662
  • Dergi Adı: JOURNAL OF SYNCHROTRON RADIATION
  • Sayfa Sayıları: ss.537-542

Özet

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.