Construction of Fluorine‐ and Piperazine‐Engineered Covalent Triazine Frameworks Towards Enhanced Dual‐Ion Positive Electrode Performance

• DOI: 10.1002/cssc.202201219
• Publication Date: 2022-08-23T06:28:00Z
• Authors: Tao Wang; James Anthony Gau...; Meijia Li; Bishnu Prasad Tha...; Juntian Fan; Liqi Qiu; Debabrata Moitra; Takeshi Kobayashi; Ilja Popovs; Zhenzhen Yang; Sheng Dai
• Keywords: Triazine; Piperazine; Fluorine

Organic positive electrodes featuring lightweight and tunable energy storage modes by molecular structure engineering have promising application prospects in dual-ion batteries. Herein, a series of highly porous covalent triazine frameworks (CTFs) were synthesized under ionothermal conditions using fluorinated aromatic nitrile monomers containing piperazine ring. Fluorinated can result more defects CTFs, leading to higher surface area up 2515 m2 g-1 N content 11.34 wt % compared the products from non-fluorinated monomer. The high abundant redox sites these CTFs afforded specific capacities (up 279 mAh at 0.1 A ), excellent rate performance (89 5 durable cycling (92.3 retention after 500 cycles 2.0 ) as electrodes.