Organic salts such as spiro-（1,1’）-bipyrrolidinium tetrafluoroborate（[SBP][BF4]） dissolved in liquid acetonitrile（ACN） are a new kind of organic salt solution,which is expected to be used as an electrolyte in electrical double layer capacitors（EDLCs）.To explore the physicochemical properties of the solution,an all-atom force field is established on the basis of AMBER parameter values and quantum mechanical calculations.Molecular dynamics（MD） simulations are carried out to explore the liquid structure and physicochemical properties of [SBP][BF4] electrolyte at room temperature.The computed thermodynamic and transport properties match the available experimental results very well.The microscopic structures of [SBP][BF4] salt solution are also discussed in detail.The method used in this work provides an efficient way of predicting the properties of organic salt solvent as an electrolyte in EDLCs.
