L.Assuma^a, A.Santiago^a, Y. Kervalla^a, JM. Mouesca^a, V. Maurel^a, T. Gutel^b, L. Dubois^a, S. Sadki^a

Organic radical species, particularly pendant nitroxide radical polymers, have been explored as a cathode-active, charge-storage material for secondary Li-ion batteries¹. However, nitroxide radical contained polymers are derivatives of conventional plastics, which are insulator, and a very large amount of conducting agents (such as carbon black, graphite, graphene and carbon fibers), even up to 60-80 wt% of the total electrode, is required in the fabrication of the composite electrode and this leads to a decrease of the composite electrode capacity². In order to decrease de quantity of conducting agents we combined a stable nitroxide radical with a conductive polymer backbone constituted by 2,7-bisthiophene carbazole, which is characterized by high thermal stability and high conductivity. In this work we present the synthesis of this new electro-active conductive redox polymer, the electrochemical characterization, the ESR characterization and battery test. The previous results showed a very high electrochemical reversibility of this system, and a superposition between the redox potential of bisthiophene carbazole backbone and nitroxide radical . Moreover, the preliminary battery test displayed a good capacity (about 60 mAh / g) and a good life cycle, about 50 cycles for a discharge rate equals to C/10.. Thanks to these preliminary results, this polymer could be a viable alternative to the actual radical redox polymers.

(1) Song, Z.; Hapshen Z., Energy and environmental Science 2013, 60, 2280.

(2) Lihuan X., Fang, Y., Chang, S., Lvlv Ji, Cheng Z., Electrochimica Acta, 2014, 130, 148-155.