Phenothiazine-functionalized poly(norbornene)s as high-rate cathode-materials for organic batteries

Otteny F, Studer G, Kolek M, Bieker P, Winter M, Esser B

Zusammenfassung

Organic cathode materials are handled as promising candidates for new energy storage solutions based on their transitionmetal free composition. Phenothiazine-based polymers are attractive due to their redox potential of 3.5 V vs. Li/Li+ and high cycling stabilities. We herein present three types of poly(norbornene)s, functionalized with phenothiazine units through either a direct connection or ester linkages, as well as their cross-linked derivatives. The directly linked poly(3-norbornylphenothiazine)s demonstrate excellent rate capability and cycling stability with a capacity retention of 73% after 10,000 cycles at a C-rate of 100C rate for the cross-linked polymer. The polymer network structure of the cross-linked poly(3norbornylphenothiazine) herein is beneficial for its rate performance