Open AccessX‐ray Raman spectroscopy of lithium‐ion battery electrolyte solutions in a flow cell
Author(s) -
Ketenoglu Didem,
Spiekermann Georg,
Harder Manuel,
Oz Erdinc,
Koz Cevriye,
Yagci Mehmet C.,
Yilmaz Eda,
Yin Zhong,
Sahle Christoph J.,
Detlefs Blanka,
Yavaş Hasan
Publication year - 2018
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577518001662
Subject(s) - propylene carbonate , electrolyte , chemistry , ethylene carbonate , raman spectroscopy , inorganic chemistry , lithium (medication) , k edge , analytical chemistry (journal) , absorption spectroscopy , electrode , organic chemistry , medicine , physics , quantum mechanics , endocrinology , optics
The effects of varying LiPF 6 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 LiBF 4 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.