Synthesis and Electrochemical Characterization of New Electro-Active Polymer Bearing TEMPO Functional Groups

Wednesday, 31 May 2017: 11:40
Grand Salon C - Section 15 (Hilton New Orleans Riverside)
 Synthesis and electrochemical characterization of new electro-active polymer bearing TEMPO functional groups

L.Assumaa, A.Santiagoa, Y. Kervallaa, JM. Mouescaa, V. Maurela, T. Gutelb, L. Duboisa, S. Sadkia

a. INAC-SPrAM-SYMMES, bLITEN-DEHT-Laboratoire des Composants pour Batteries, CEA 17, rue des Martyrs, Grenoble

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.