High Power and Energy Density Supercapacitors Based on Conductive Polymers
P.J. Kinlen, S. Viswanathan, J.-H. Young, Y.-G. Kim, J. Mbugua, J. Simpson, W.-S. Shih, M. Stroder, K. Edwards, H.-L. Nguyen
Keywords: supercapacitor, CNT, conductive polymers, ICPs, EDLC, ultracapacitor, pseudocapacitance
Abstract:Crosslink, in collaboration with Brewer Science and the U.S. Army, is developing novel materials and device structures for electrochemical double layer capacitors (EDLCs), or supercapacitors. Efforts are focused on the development of highly conductive processable inherently conductive polymers (ICPs), for use as electrodes in new EDLC device structures. The use of ICPs reduces the overall weight of the capacitors – making them more cost effective than currently available COTS supercapacitors and/or batteries—and boosts energy density via added RedOx and pseudocapacitance capability, which is correlated with p- and n-type polymer doping. In this program, Crosslink’s technical edge lies in utilizing ICP-based electrodes prepared under processing conditions that provide properties such as high metallic conductivity (greater than 1000 S/cm) enabling the fabrication of low ESR devices. A parallel effort involves the development of carbon nanotube-conducting polymer composite supercapacitors with superior charge storage performance that arises from their ability to synergistically merge the high surface area and electrical conductivity of carbon nanotubes with the RedOx electrochemistry of conducting polymers.