Anthraquinone-Based Conjugated Microporous Polymer as Anode for Long-Life Lithium Batteries
Fengyuan Lu, Yuanyuan Che, Hualing Tian, Yanjun Cai, Qingrong Kong, Xiang Yao, Zhi Su
Abstract
Conjugated microporous polymers (CMPs), as an emerging class of organics, have generated keen interest due to their excellent structural stability and stronger designability. Herein, redox donor–acceptor conjugated microporous polymers (TAPB-AQ and PBAPD-AQ) were prepared by utilizing anthraquinone and anilines as linkers via C–N linkages and used as anodes to build high-performance LIBs. Compared with TAPB-AQ, PBAPD-AQ has more electroactive groups, a narrower band gap, and higher thermal decomposition temperatures (5% mass loss was up to 384 °C). Benefiting from the insolubility in electrolyte and richer pore structure, PBAPD-AQ shows a high capability (219.8 mA h g –1 at 0.5 A g –1 ) and ultrastable cycling performance (96.1% retention after 1200 cycles at 0.5 A g –1 ). Moreover, the lithium storage mechanism of PBAPD-AQ as the anode electrode material is explored through ex situ XPS and DFT computations.