a solid ionic electrolyte having an organic plastic crystal solvent doped with lithium bioxalato borate salt may be used in an electrochemical device . electrochemical devices are disclosed having a cathode , an anode , and a solid ionic electrolyte having a neutral organic plastic crystal solvent doped with libob alone or in combination with another lithium salt . such devices have a stable electrolyte interface over a broad potential window combined with high energy density delivery capacity and , in one example , the favorable properties of a neutral organic plastic crystal matrix such as succinonitrile .