A gel single ion polymer electrolyte membrane for lithium-ion batteries with wide-temperature range operability

Abstract

We report excellent operability of a lithium-ion battery with a gel membrane of an sp³ boron-based single ion polymer, lithium poly(1,2,3,4-butanetetracarboxylic acid borate) (LiPBAB), as the electrolyte. The battery exhibits outstanding performance in a wide temperature range of 25–100 °C with high ionic conductivity of 2.9 × 10⁻⁴ S cm⁻¹, high electrochemical stability of 4.3 V, a large cationic transference number t⁺ of 0.89 and an excellent mechanical strength of 33 MPa at room temperature. The remarkable cyclic stability of the battery at 100 °C demonstrates exceptional device safety enabled by the electrolyte membrane.