Novel Single Lithium‐Ion Conducting Polymer Electrolyte Based on Poly(hexafluorobutyl methacrylate–co–lithium allyl sulfonate) for Lithium‐Ion Batteries

Abstract A new type of single‐ion conducting polymer electrolyte for lithium‐ion batteries, poly(hexafluorobutyl methacrylate‐ co ‐lithium allyl sulfonate) (P (HFMA‐ co ‐ASLi)), was firstly prepared by copolymerizing hexafluorobutyl methacrylate (HFMA) and sodium allyl sulfonate (SAS) with a subsequent lithiation process. The prepared polymer electrolyte exhibits high lithium ionic conductivity (10 −4 S cm −1 at 80 °C) and excellent cycle performance at high temperature, which could be attributed to the good thermal stability (remains stable up to 300 °C), mechanical properties (7.1 MPa for breaking strength) and high lithium‐ion transference number (0.92). The electrolyte also displays good electrochemical stability (4.6 V). Our obtained results prove that the polymer P (HFMA‐ co ‐ASLi) is a promising candidate electrolyte for lithium‐ion batteries.