π-Extended Dihydrophenazine-Based Polymeric Cathode Material for High-Performance Organic Batteries

Organic electrode materials have attracted wide-spread attention as alternative candidates for lithium-ion batteries due to their potential for sustainable production, wide source, low cost, and adjustability. Herein, we develop a dihydrophenazine-based multielectron redox center to promote the energy and power density of organic batteries. The poly(1,3,5-tris(10-(4-vinylphenyl)phenazin-5(10H)-yl)benzene) (p-TPZB)-based battery shows a specific discharge capacity of 155 mAh g(-1) with a discharge voltage of 3.1-4.2 V (vs Li+/Li) initially. Until the 2000th cycle, the specific discharge capacity is still maintained up to 138 mAh g(-1), with an excellent capacity retention rate of ca. 89% at 2C. Meanwhile, the p-TPZBILi cell delivers outstanding power density and energy density up to 4320 W kg(-1) and 522 Wh kg(-1), respectively. Moreover, p-TPZB also has shown potential as an active material for sodium-ion batteries (SIBs). Our study provides a structure and strategy to improve the capacity and density of next-generation high-performance lithium/sodium-ion batteries.