| 초록 |
Some of radical polymers displayed a reversible and very rapid redox: for example, the nitroxide radical forms its oxoammonium salt (a p-type doping), with which an organic-cathode of secondary battery was fabricated. On the other hand, the phenoxyl radical was rapidly and reversibly reduced to its phenolate form (a n-type doping), and anode-active. The very rapid redox or one-electron transfer of the radical polymers (electron-transfer rate constant = 10-1 cm/s, apparent diffusion constant of charge transfer = 10-8 cm2/s) enabled a dramatically high power-rate performance during the charging and discharging process of the secondary battery composed of these radical polymers. No deterioration both in the capacity and the power-rate was observed up to 10,000 charging and discharging cycles: The surprisingly long cyclability was ascribed to the simple electron transfer reaction and to the amorphous electrode structure. Environmentally-benign features of the totally organic-based battery are strong advantage against metal-based conventional batteries. A transparent, flexible organic battery composed radical polymer electrodes possesses a potential application in ubiquitous, wearable electronic devices. The use of organic radical polymers in a polymer memory, an electrochromic display, and a magnetic device will be also described, which can open the possibility to design the next generation electronic devices. |
