Center for Relativistic Laser Science

2017 120th KCS Meeting

Electrolyte in lithium ion battery is mixture of lithium salt and carbonate solvents. Lithium ion is the charge carrier, carbonates form stable solvation sheath of Li⁺. Here two-dimensional infrared spectroscopy is applied to study dynamics of electrolyte in lithium ion battery. In LiPF₆ diethylcarbonate(DEC) solution, 2DIR spectra show increasing cross-peaks which means ultrafast exchange dynamics. The exchange time, which are calculated with 2DIR spectra and two state model, are on picosecond timescale. 2DIR spectra of DEC and propylene carbonate(PC) mixed solvent system, cross-peaks are observed as ever at same timescale.