Published January 1, 2018
| Version v1
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X-ray Raman spectroscopy of lithium-ion battery electrolyte solutions in a flow cell
Creators
- 1. Ankara Univ, Fac Engn, Dept Engn Phys, TR-06100 Ankara, Turkey
- 2. Univ Potsdam, Inst Earth & Environm Sci, D-14476 Potsdam, Germany
- 3. Deutsch Elektronen Synchrotron DESY, D-22607 Hamburg, Germany
- 4. Univ Liverpool, Stephenson Inst Renewable Energy, Dept Phys, Liverpool L69 7ZE, Merseyside, England
- 5. Offenburg Univ Appl Sci, Inst Energy Syst Technol INES, D-77652 Offenburg, Germany
- 6. European Synchrotron Radiat Facil, F-38043 Grenoble, France
Description
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.
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