A novel phosphorus-containing pyridinium porous organic framework with flame retardancy for enhancing efficiency and safety of solid-state polymer electrolyte

The development of solid-state polymer electrolytes (SPEs) is aimed to obtain electrolyte materials with higher ionic conductivity, better mechanical properties, and greater flame retardancy. Based on the above considerations, a phosphorus-containing cationic porous organic polymer (ZR-POF) is prepared through "one-pot" three- component polymerization and incorporated as a filler to prepare poly(ethylene oxide) (PEO)-based SPEs. By padding ZR-POF into PEO, the ionic conductivity of SPEs is significantly improved, especially the PEO-10 % ZRPOF electrolyte exhibits the highest ionic conductivity at 90 degrees C (1.26 x 10-3 S cm- 1 ). And due to the nanosheet characteristics of ZR-POF, SPEs exhibit excellent mechanical properties, could form a more stable interface with the metal anode. It is worth noting that the introduction of phosphorus endows SPEs with excellent flame retardant properties, achieving rapid self-extinguishing within 12 s under intense combustion. Therefore, the resultant battery based on PEO-10 % ZR-POF electrolyte exhibits excellent electrochemical performance, with a capacity maintained at 591.8 mAh g- 1 and a capacity attenuation rate of 0.027 % over 500 cycles at 1 C.