Synthesis of Semi-IPN Polymer Electrolytes Containing Binary Lithium Salt and Their Electrochemical Properties

Abstract

In this study, we have synthesized a poly(methylsiloxane-g-PEO) with ethylene oxide groups and prepared polymer electrolytes using lithium perchlorate (LiClO4) or LiClO4 with lithium methacrylate (BF3-LiMA). In the electrochemical measurement after UV curing of the polymer electrolyte, BF3-LiMA-introduced binary lithium salt had a high room temperature ionic conductivity of 2.63×10 S/cm and it was able to obtain relatively better electrochemical stability of 5 V. The prepared polymer electrolyte was then impregnated and crosslinked on the LMO electrode to fabricate a composite electrode, and a battery test consisting of a lithium/electrolyte/composite electrode was performed. As a result, although the high interface resistance of the oxidation electrode was observed in the binary lithium salt system, the capacity retention characteristic was better than that of the LiClO4 salt system.