A novel conjugated porous polymer based on triazine and imide as cathodes for sodium storage
Huichao Dai, Jincheng Zou, Yanbo Gao, Zengyu Li, Chenyang Zhang, Guoqun Zhang, Xiaobo Wang, Chengliang Wang
Abstract
Abstract Organic electrode materials have attracted more and more attention for sodium‐ion batteries (SIBs) that are regarded as one of the most promising alternatives of lithium‐ion batteries, because they can endure the storage of large sodium ions (with a larger radius than that of lithium ions) without obvious volume change. Herein, we report a novel conjugated porous polymer (TPIP) based on triazine and imide as cathodes material for SIBs. TPIP has abundant redox‐active sites, good thermal stability (400°C) and large specific surface area (306 m 2 g −1 ). As a result, TPIP electrode delivered a specific capacity of 120 mAh g −1 after 50 cycles at a current density of 0.1 A g −1 and 85 mAh g −1 after 150 cycles at a current density of 1.0 A g −1 . Ex‐situ X‐ray photoelectron spectra and Fourier transform infrared spectra showed that the TPIP electrodes reversibly stored three sodium ions per unit through the triazine rings and half of the carbonyl groups. These results deepen our understanding of charge storage mechanisms of polymers with triazine and imide units and will provide guidance for the future design of electrode materials for high‐performance SIBs.