A Dielectric Polymer with High Electric Energy Density and Fast Discharge Speed
Baojin Chu,1,2
Xin Zhou,3
Kailiang Ren,3
Bret Neese,1,2
Minren Lin,2
Qing Wang,1,2
F. Bauer,4
Q. M. Zhang1,2,3*
Dielectric polymers with high dipole density have the potential to achieve very high energy density, which is required in many modern electronics and electric systems. We demonstrate that a very high energy density with fast discharge speed and low loss can be obtained in defect-modified poly(vinylidene fluoride) polymers. This is achieved by combining nonpolar and polar molecular structural changes of the polymer with the proper dielectric constants, to avoid the electric displacement saturation at electric fields well below the breakdown field. The results indicate that a very high dielectric constant may not be desirable to reach a very high energy density.
1 Materials Science and Engineering Department, Pennsylvania State University, University Park, PA 16802, USA.
2 Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA.
3 Electrical Engineering Department, 5 Rue du General Cassagnou, 68300 Saint-Louis, France.
4 Institute Franco-Allemand de Recherches, 5 Rue du General Cassagnou, 68300 Saint-Louis, France.
* To whom correspondence should be addressed. E-mail: qxz1{at}psu.edu
