An electrochemical study of PEO:LiBF4−glass composite electrolytes

Several solid electrolytes derived from poly(ethylene oxide) doped with lithium tetrafluoroborate and a high conductivity lithium borosulfate glass were formulated and investigated for their electrochemical performance. The electrochemical characterization included a.c. impedance measurements, the temperature dependence of conductivity, scanning electron microscopy (SEM), cyclic voltammetry (CV), and the charge/discharge cycling of symmetric cells. the ionic conductivities of these electrolytes at ambient temperature were around 10−7 S cm−1. Although no significant improvement in conductivity was observed, the cyclic voltammetry, impedance spectroscopy, and cycling data on Li/polymer/Li and Li/polymer/ Ni cells reveal that the electrode reactions are facilitated by the glass incorporation.