Spectroscopic investigations of solutions of lithium bis(fluorosulfonyl) imide (LiFSI) in valeronitrile

In the present work, the complexation of lithium bis(fluorosulfonyl)imide (LiFSI) with valeronitrile was studied spectroscopically (Raman, Infrared (IR), nuclear magnetic resonance (NMR)). Based on the spectroscopic information, a chemical model for the complexation was developed. [Display omitted] Lithium bis(fluorosulfonyl) imide (LiFSI) is an interesting electrolyte for lithium ion batteries and valeronitrile is a good solvent for LiFSI as it forms complexes with the Li+-ions. In the present work, this complexation was studied by optical spectroscopy (Raman and IR), as well as by nuclear magnetic resonance (NMR) spectroscopy. Based on these spectrocopic information a chemical model for the complexation was developed and the equilibrium constants for the formation of the different species that were considered are reported.