Developing a three-dimensional co-continuous phase network structure via enhanced inter-component affinity for high-performance flexible organic radical electrodes

Abstract

Inspired by the results of molecular dynamics simulation, a novel binary poly(ethylene-alt-2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) maleate) (PETM) and single-walled carbon nanotube (SWNT) nanocomposite thin film is first prepared and used as a flexible radical electrode. Benefiting from the enhanced affinity of PETM for SWNTs, a three-dimensional homogeneous co-continuous phase network structure is achieved in the PETM/SWNT electrode, which contributes to its high electrical conductivity, outstanding mechanical properties, and long-term deformation endurance. More importantly, the PETM/SWNT electrode exhibits a remarkable long-cycle life (96% capacity retention after 2000 cycles) and exceptional rate capability (almost unchanged capacity ranging from 5 to 50C). Additionally, a pouch cell based on the PETM/SWNT electrode demonstrated a stable operating voltage to power LED light strips under variant bending angles. These findings have practical significance towards designing high-performance flexible organic radical batteries.