TEMPO-Contained Polymer Grafted onto Graphene Oxide via Click Chemistry as Cathode Materials for Organic Battery

Poly(2,2,6,6-tetramethylpiperidin-1-oxyl-4-yl methacrylate) (PTMA) is a typical organic battery material containing nitrogen and oxygen radicals. The grafting of PTMA onto graphene oxide to obtain composite cathode material poly(2,2,6,6-tetramethylpiperidin-1-oxyl-4-yl methacrylate)-Graphene Oxide (PTMA-GO) via click chemistry is reported. The method of preparing PTMA-GO is completed at room temperature, which can retain the oxygen-containing functional groups on the surface of graphene oxide, and the process is simple and easy to conduct. The composite materials are characterized by infrared, X-ray diffraction, thermogravimetry, and electron paramagnetic resonance. The cathode material is assembled in a button battery to measure its cyclic voltammogram, electrochemical impedance spectroscopy, and charge and discharge capacity cycles. It is found that the PTMA-GO electrode is twice as conductive as the PTMA electrode alone. The specific capacity of the PTMA-GO electrode is nearly 2.3 times higher than that of the PTMA electrode after 300 charge–discharge cycles. This represents an important reference value for the development of organic batteries, especially for the research of nitroxide radical polymer electrode materials.