A Novel Salen‐based Porous Framework Polymer as Durable Anode for Lithium‐Ion Storage
Xinlu Zhang, Jiachen Wang, Caiyan Yu, Haibo Li, Fanyue Meng, Ting Lu, Likun Pan
Abstract
Abstract Organic electrode materials with abundant resources, environmental friendliness and recyclability play a crucial role in rechargeable lithium‐ion batteries (LIBs). However, the inferior electrical conductivity and unsatisfactory long‐term cycling performance seriously impede their large‐scale application in LIBs. Herein, a novel salen‐based porous framework polymer (SPP) with a large conjugated skeleton was constructed and utilized as anode for LIBs. Owing to its unique architecture with a large conjugated skeleton facilitating the electron transport, rich pores accelerating the organic electrolyte infiltration, and stable skeleton structure improving the long‐term cycling performance, SPP delivered a high specific capacity of 337 mA h g −1 at 0.1 C (1 C=250 mA g −1 ) after 100 cycles, and robust rate capacity of 95.5 mA h g −1 at 32 C. Importantly, an impressive long‐term cycling performance with a storage capacity of 155.7 mA h g −1 at 8 C after 4000 cycles was obtained, showing a durable cyclic stability of SPP. Furthermore, the lithium storage mechanism of SPP was evaluated by ex‐situ X‐ray photoelectron spectroscopy, manifesting that the multiple active sites of C=N, −OH, and benzene ring were responsible for the superior lithium storage performance. The novel SPP presented in this work should be a promising organic electrode for energy storage applications.