High-performance all-polymer dielectric and electrical energy storage materials containing conjugated segment and multi-fluorinated pendants

摘要

Highly polarizable block copolymer consisting of insulating polynorbornene and conductive polyacetylene segments with multi-fluorinated pendants was synthesized by tandem ring-opening metathesis polymerization and metathesis cyclopolymerization, which displayed relatively high dielectric constant of 8, very low dielectric loss of about 0.003, and enhanced energy density of 11.45 J cm(-3) at the electric field strength of 450 MV m(-1) accompanied with an excellent charge-discharge efficiency of 99%. The outstanding dielectric and energy storage capability were mainly attributed to high dipole moment of multi-fluorinated groups on polymer backbone and the interfacial polarization derived from the unique self-assembled nanostructure of block copolymers.