Preparation of Organic-based Radical Battery using Polyviologen Anode and Poly(TEMPO radical) Cathode

Abstract

In this experiment, poly(tripyridinio mesithylene) (PTPM) as an anode-active material and poly(2,2,6,6-tetramethylpiperidine-4-yl acrylamide)-poly(acrylicacid) (PTAm-PAA) as a cathode-active material was researched. PTPM has a cross-linked structure which leads to a long life time. It shows two electron reversible redox behavior which helps the radical battery to have high theoretical capacity. PTAm-PAA is rapidly and reversibly oxidized. Moreover, its high molecular weight helps in the formation of film and in having a long cycle life. The capacity of PTPM half-cell was 115 mAh/g, and it maintained 95 % capacity after 200 cycles. The capacity of PTAm-PAA half-cell was 106 mAh/g, and it maintained 98 % capacity after 200 cycles. Full-cell was fabricated with PTPM anode, PTAm-PAA cathode and aqueous NaCl electrolyte. The cell voltage of the full-cell was 1.1 and 1.5 V coinciding with difference of PTPM and PTAm-PAA voltages. The capacity of full-cell was 114 mAh/g and it maintained 95 % capacity after 200 cycles. According to the C rate, the rate performance of the full-cell was changed but the discharging capacity of the full-cell was 114 mAh/g at 15 C. (76 % coulombic efficiency)