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

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Wang, Tao
Gaugler II, James Anthony
Li, Meijia
Thapaliya, Bishnu Prasad
Fan, Juntian
Qiu, Liqi
Moitra, Debabrata
Kobayashi, Takeshi
Popovs, Ilja
Yang, Zhenzhen
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Iowa State University Digital Repository, Ames IA (United States)
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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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 a piperazine ring. Fluorinated monomers can result in more defects in CTFs, leading to a higher surface area up to 2515 m2 g−1 and a higher N content of 11.34 wt % compared to the products from the non-fluorinated monomer. The high surface area and abundant redox sites of these CTFs afforded high specific capacities (up to 279 mAh g−1 at 0.1 A g−1), excellent rate performance (89 mAh g−1 at 5 A g−1), and durable cycling performance (92.3 % retention rate after 500 cycles at 2.0 A g−1) as dual-ion positive electrodes.
This is a manuscript of an article published as Wang, Tao, James Anthony Gaugler, Meijia Li, Bishnu Prasad Thapaliya, Juntian Fan, Liqi Qiu, Debabrata Moitra et al. "Construction of Fluorine‐and Piperazine‐Engineered Covalent Triazine Frameworks Towards Enhanced Dual‐Ion Positive Electrode Performance." ChemSusChem 16, no. 4 (2023): e202201219. DOI: 10.1002/cssc.202201219. Copyright 2022 Wiley-VCH GmbH. Posted with permission. DOE Contract Number(s): AC02-07CH11358; AC05-00OR22725.
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