Functionalized meso/macro-porous single ion polymeric electrolyte for applications in lithium ion batteries
We report a method to significantly enhance the conductivity of lithium ions in a polymeric lithium salt membrane by introducing functionalized meso/macro-pores to accommodate a mixture of organic solvents in the polymer matrix. The meso/macro-porous membrane is formed by a lithium poly[4-styrenesulfonyl(phenylsulfonyl)imide] polymer and serves as an electrolyte in lithium ion batteries. The substantially enhanced ionic conductivity of the membrane arises from the facile release of the lithium ions to the solvent and the extensive interconnectivity of the meso/macro-pores that provides a smooth passage for the solvated lithium ions to transport. The fabricated meso/macro-porous polymer membrane displays excellent high-temperature sustainability and wide electrochemical stability, important for battery safety and enhancement of device performance and longevity. The performance of the membrane is demonstrated in an assembled Li-ion battery cell.