Solid Electrolyte Based on Succinonitrile and LiBOB

This paper reports physical and electrochemical properties of a solid electrolyte for lithium batteries formed by doping a plastic crystal solvent, succinonitrile, with lithium bioxalato borate . Thermal properties, solubility limits, conductivity, compatibility with lithium, and range of electrochemical stability have been studied. Succinonitrile doped with is a solid at room temperature and melts near . Electrochemical cells employing either or as the active cathode material and lithium metal as the anode were evaluated. This solid electrolyte showed excellent performance when combined with a cathode, delivering a reversible discharge capacity of with very good capacity retention. However, with the cathode, the cell's capacity retention was not as good exhibiting a discharge capacity that decreased from in the first cycle to at 20th cycle.