ORGANIC RADICAL BATTERY: NITROXIDE POLYMERS AS A CATHODE-ACTIVE MATERIAL

摘要

Stable Nitroxyl polymers, such as poly (2,2,6,6-tetramenthyl-l-piperidinyloxy-4-yl methacrylate) (PTMA), are known to be effective as cathode active materials for lithium rechargeable betteries.The nitroxide radicals displayed a reversible and very rapid redox performances .We present a new synthesized method to get PTMA powder, then a doctor-blading method was used to prepare the PTMA composite electrodes, enabling successful production of homogeneous electrodes. It was characterized through FT-IR and SEM methods.The organic radical battery consists of lithium metal anode and PTMA cathode with an active material content of 65wt percent .The best performance is achieved with a thin cathode that shows nearly 100 percent utilization of the active material (111mAh/g) at O.lC.Through the electrochemical tests, it was found that there was a stable plateau at 3.5V while discharging. Besides, the cycling stability and rate capability were measured in detail. Although they showed a certain quantity of irreversible capacity on the first cycle, the capacity stabilized after the second cycle.