Polymer film capacitors with high dielectric constant, high capacitance density, and high energy density

A series of high dielectric constant polymers have been developed with K from 10 to over 50. The high-K polymers have high dielectric breakdown strength above 700 V/μm and high energy density up to 27 J/cm³ in lab-scale small sample test. As thermoplastic semi crystalline polymers similar to polypropylene, these high-K polymers can be processed into thin capacitor film using melt-extrusion and biaxial orientation process and film thickness from 2 μm to 10 μm has been achieved. Metallized prototype capacitors show promising performance with energy density above 5 J/cm³. Future development will target at 10 J/cm³ energy density in the packaged capacitors. On the other hand, the capability to produce ultrathin capacitor film enables the manufacturing of film capacitors with high capacitance density above 10 μF/cm³. Potential applications include pulsed power capacitors for external and implantable medical defibrillators, and other industrial applications.