Novel single lithium‐ion conducting polymer electrolyte based on poly(hexafluorobutyl methacrylate‐co‐lithium allyl sulfonate) for lithium‐ion batteries

A new type of single-ion conducting polymer electrolyte, poly(hexafluorobutyl methacrylate-co-lithium allyl sulfonate) (P (HFMA-co-ASLi)) for lithium-ion batteries, 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 ℃) and excellent cycle performance at high temperature, which could be attributed to the good thermal stability (remains stable up to 300 ℃), mechanical property (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.