Defective 2D Covalent Organic Frameworks for Postfunctionalization

Defects are deliberately introduced into covalent organic frameworks (COFs) via a three‐component condensation strategy. The defective COFs (dCOF‐NH2‐Xs, X = 20, 40, and 60) possess favorable crystallinity and porosity, as well as have active amine functional groups as anchoring sites for further po...

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Vydáno v:Advanced functional materials Ročník 30; číslo 10
Hlavní autoři: Li, Zhen, Liu, Zhi‐Wei, Li, Zeyu, Wang, Tian‐Xiong, Zhao, Fulai, Ding, Xuesong, Feng, Wei, Han, Bao‐Hang
Médium: Journal Article
Jazyk:angličtina
Vydáno: Hoboken Wiley Subscription Services, Inc 01.03.2020
Témata:
amine anchoring site
Anchoring
Condensates
Crystal defects
Crystal structure
Crystallinity
defective covalent organic framework
Electrolytes
Functional groups
Lithium
Lithium-ion batteries
lithium‐ion conduction
Materials science
Materials selection
Molten salt electrolytes
Porosity
Porous materials
postfunctionalization
solid electrolyte material
Solid electrolytes
ISSN:1616-301X, 1616-3028
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Shrnutí:Defects are deliberately introduced into covalent organic frameworks (COFs) via a three‐component condensation strategy. The defective COFs (dCOF‐NH2‐Xs, X = 20, 40, and 60) possess favorable crystallinity and porosity, as well as have active amine functional groups as anchoring sites for further postfunctionalization. By introducing imidazolium functional groups onto the pore walls of COFs via the Schiff‐base reaction, dCOF‐ImBr‐Xs‐ and dCOF‐ImTFSI‐Xs‐based materials are employed as all‐solid‐state electrolytes for lithium‐ion conduction with a wide range of working temperatures (from 303 to 423 K), and the ion conductivity of dCOF‐ImTFSI‐60‐based electrolyte reaches 7.05 × 10−3 S cm−1 at 423 K. As far as it is known, it is the highest value for all polymeric crystalline porous material based all‐solid‐state electrolytes. Furthermore, Li/dCOF‐ImTFSI‐60@Li/LiFePO4 all‐solid Li‐ion battery displays satisfactory battery performance under 353 K. This work not only provides a new methodology to construct COFs with precisely controlled defects for postfunctionalization, but also makes them promising candidate materials as all‐solid‐state electrolytes for lithium‐ion batteries operate at high temperatures. Defective COFs (dCOFs) with active amine functional groups as anchoring sites for postfunctionalization are constructed. After the postfunctionalization process, dCOF‐ImBr‐Xs‐ and dCOF‐ImTFSI‐Xs‐based materials are employed as all‐solid‐state electrolytes for lithium‐ion conduction. As a result, the dCOF‐ImTFSI‐60@Li‐based electrolyte exhibits outstanding lithium‐ion conductivity values, and the Li/dCOF‐ImTFSI‐60@Li/LiFePO4 all‐solid Li‐ion battery displays satisfactory battery performance under 353 K.
Bibliografie:ObjectType-Article-1
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ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.201909267