Exploit PVDF based copolymers for high energy density capacitors use

As a kind of emerging organic electronic materials, fluorinated electroactive polymers have been substantially developed in recent years. Among these materials, some poly(vinylidene fluoride) based copolymers have shown great potential in application for supercapacitors due to their high energy density (25J/cc), which is 10 times higher than that of commercially used polypropylene (2J/cc).

Here we modified one of such kind of polymers via photo-crosslinking method to further increase the stored energy density. Cross-linking favors formation of polar crystalline phase, drastic reduction of spherulite sizes and increase in copolymer inner interface area.The cross-linked P(VDF-CTFE)s possess high breakdown field as well as remarkably elevated polarization, both of which contribute to the enhanced energy density as high as 22.5J/cc. This copolymer case may facilitate a better design for polymer dielectric materials in their application of high energy density capacitors.

Moreover, patterned thin films with various shapes and sizes are fabricated by photolithography, which sheds new light on integration of PVDF-based electroactive polymers into organic microelectronic devices such as flexiblepyroelectric/ piezoelectric sensor arrays or nonvolatile ferroelectric memory devices.

Details can be found at :

Chen, X. Z.; Li, Z. W.; Cheng, Z. X.; Zhang, J. Z.; Shen, Q. D.; Ge, H. X.; Li, H. T., GreatlyEnhanced Energy Density and Patterned Films Induced by Photo Cross-Linking ofPoly(vinylidene fluoride-chlorotrifluoroethylene). Macromolecular Rapid Communications 2011, 32 (1), 94-99.

Chen, X. Z.; Cheng, Z. X.; Liu L.; Yang X. D.; Shen, Q. D.; Hu W. B.; Li, H. T., Evolution of nano-polar phases, interfaces and increased dielectric energy storage capacity in photoinitiated cross-linked Poly(vinylidene fluoride)-based copolymers. Colloid and Polymer Science 2013, 291 (8), 1989-1997.