Ion Conduction and Electrochemical Performance of Poly(ozetane)-Based Electrolytes with Tri(cyanoethoxymethyl) Moiety As a Side Chain

摘要

We have prepared solid polymer electrolyte films based on poly(oxetane) with tri(cyanoethoxymethyl) moiety as a side chain. The oxetane monomer (COA) was synthesized by coupling reaction between oxetane with carboxylic acid moiety and branched amine with tri(cyanoethoxymethyl) groups. COA was polymerized though ring opening reaction of oxetane by using cationic initiator, BF_3(Et)_2O. The solid polymer electrolyte films were prepared from the poly(oxetane), poly(vinyhdenedifluoride-co-hexafluoropropylene), and LiTFSA. The highest ionic conductivity for the polymer electrolyte films was 0.74 mS cm~(-1) at 343 K and 0.098 mS cm~(-1) at 293 K. Electrochemical stability of the electrolyte films, and plating and stripping processes of lithium in the films were investigated by linear sweep and cyclic voltammetric techniques.