la9b02758_si_001.pdf (1.13 MB)
Anion Storage Behavior of Graphite Electrodes in LiBF4/Sulfone/Ethyl Methyl Carbonate Solutions
journal contribution
posted on 2019-11-08, 22:30 authored by Yunju Wang, Jiayu Li, Yuhao Huang, Hongyu WangThe electrolyte solutions
of 1 M LiBF4 dissolved in
ethyl methyl carbonate (EMC)/sulfone mixtures are applied for dual-ion
batteries using graphite positive electrodes. The representative sulfone
solvents include sulfolane (SL) and 3-methylsulfolane. Graphite electrodes
can deliver higher capacity of anion storage in the solutions of the
mixed solvents than those of pure solvents. Traditional electrochemical
and in situ X-ray diffraction measurements are performed on Li/graphite
cells to probe the anion intercalation process at the interface between
graphite electrode and electrolyte solutions. Ionic conductivity,
viscosity, and NMR tests are carried out to characterize electrolyte
solutions. The effects of ion-pairing between Li+ and BF4– and the anion solvations by EMC or sulfones
on the anion storage in graphite have been addressed.