Impregnation of sulfur into a 2D pyrene-based covalent organic framework for high-rate lithium–sulfur batteries

Meng, Yi; Lin, Guiqing; Ding, Huimin; Liao, Huaping; Wang, Cheng

doi:10.1039/c8ta05508d

Cited by 124 publications

(82 citation statements)

References 68 publications

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“…CTF‐1 (Figure f) with a pore diameter of 1.23 nm can load 34 wt % sulfur and the capacity drops from 1304 to 762 mAh g −1 after only 50 cycles . The sulfur loading of H 2 P‐Ph‐COF (Por‐COF; Figure d) and Py‐COF (Figure a) with porphyrin and pyrene units, respectively, can be increased to 55 and 70 wt %, respectively . Por‐COF retains a capacity of 633 mAh g −1 after 200 cycles at 0.5 C, while Py‐COF achieves a capacity of 481.2 mAh g −1 after 550 cycles at 5.0 C. The enhanced performance of Por‐COF and Py‐COF originates from the higher sulfur loading in the host COFs.…”

Section: Built‐in Functionsmentioning

confidence: 99%

Covalent Organic Frameworks: Chemical Approaches to Designer Structures and Built‐In Functions

et al. 2019

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A new approach has been developed to design organic polymers using topology diagrams. This strategy enables covalent integration of organic units into ordered topologies and creates a new polymer form, that is, covalent organic frameworks. This is a breakthrough in chemistry because it sets a molecular platform for synthesizing polymers with predesignable primary and high‐order structures, which has been a central aim for over a century but unattainable with traditional design principles. This new field has its own features that are distinct from conventional polymers. This Review summarizes the fundamentals as well as major progress by focusing on the chemistry used to design structures, including the principles, synthetic strategies, and control methods. We scrutinize built‐in functions that are specific to the structures by revealing various interplays and mechanisms involved in the expression of function. We propose major fundamental issues to be addressed in chemistry as well as future directions from physics, materials, and application perspectives.

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Section: Built‐in Functionsmentioning

confidence: 99%

Covalent Organic Frameworks: Chemical Approaches to Designer Structures and Built‐In Functions

et al. 2019

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“…Pyreneinheiten können die Schwefelbeladung auf 55 bzw. 70 Gew.‐% erhöhen . Por‐COF bewahrt eine Kapazität von 633 mAh g −1 über 200 Zyklen bei 0.5 C, im Fall von Py‐COF liegt die Kapazität nach 550 Zyklen bei 5.0 C bei 481.2 mAh g −1 .…”

Section: Integrierte Funktionenunclassified

Kovalente organische Gerüstverbindungen: chemische Ansätze für Designerstrukturen und integrierte Funktionen

et al. 2019

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Die Fortschritte der Chemie im letzten Jahrzehnt ebnen neue Wege zur Gestaltung organischer Polymere über Topologiediagramme. Dieser Ansatz ermöglicht das kovalente Zusammenfügen organischer Einheiten zu geordneten Topologien einer neuen Polymerform, den kovalenten organischen Gerüstverbindungen. Dies bedeutet einen Durchbruch in der Chemie, da nunmehr eine molekulare Plattform für die Synthese von Polymeren mit vorbestimmbaren Primärstrukturen und Strukturen höherer Ordnung zur Verfügung steht, ein zentrales Ziel, das über ein Jahrhundert lang angestrebt wurde, mit herkömmlichen Gestaltungsprinzipien aber nicht erreichbar war. Das neue Gebiet entwickelt seine eigenen Eigenschaften, die sich von jenen herkömmlicher Polymere unterscheiden. Unser Aufsatz fasst die Grundlagen und wichtigsten Fortschritte zusammen, wobei der Schwerpunkt auf der Chemie des Strukturdesigns liegt, einschließlich der Grundgedanken, Synthesestrategien und Kontrollverfahren. Wir prüfen integrierte, für die Strukturen spezifische Funktionen, indem wir verschiedene Wechselspiele und Mechanismen aufzeigen, die an der Expression der Funktion beteiligt sind. Wir benennen grundlegende Probleme, die in der Chemie und in zukünftigen Forschungsrichtungen der Physik und Materialwissenschaft zu adressieren sind, und beschreiben Anwendungsmöglichkeiten.

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“…Recent research of Ai, Wang and co-workerss howedt hat the distinctive oriented porous channels of 2D-COFs are suited to be impregnatedw ith sulfur 1) because the aggregation of sulfur is restricted and 2) especially because the diffusive loss of soluble polysulfide intermediates can be efficiently suppressed. [16] Furthermore, the post-synthetic modification (PSM) of 2D-COFs with sulfur has been also addressed in order to produce materials that have been efficiently used as cathodes in Li-Sb atteries. [17] Thus, PSM has revealed as an efficient strategy in order to complement the unique characteristics of the ordered porous structure of COFs and broaden the scopeo f their functionalities.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Covalent Bonding and Physical Encapsulation of Sulfur in the Pores of a Microporous COF to Improve Cycling Performance in Li‐S Batteries

Royuela

Almarza

Mancheño

et al. 2019

Chemistry A European J

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Lithium-sulfur batteriess tands out as ap romising technology for energy storageowing to acombination of favorablec haracteristics includingahight heoreticalg ravimetric capacity,e nergy density,i nexpensive character,a nd environmental benignity.C ovalento rganic frameworks (COFs) are ar apidlyd eveloping family of functional nanostructures which combinep orosity and crystallinity,a nd whichh ave been already used in these kinds of batteries to build sulfur electrodes, by embedding sulfur into porous COFs in order to enhancec ycle lifetimes. In this contribution, this is taken one step forward and aC OF endowedw ith vinyl groups is used,i norder to graft sulfur to the COF skeleton through inverse vulcanization. The main aim of the article is to show the synergistic effecto fcovalent bonding and physical encapsulation of sulfur in the pores of the COF in ordert oa lleviate the fatal redox shuttling process, to improvet he cycling performance, and to provide faster ion diffusion pathways.I na ddition, it is shownh ow the materialw ith covalently-bound Sp rovides better electrochemical performance underd emanding and/or changeable charge conditions than ap arent analogue material with sulfurp hysically confined,b ut without covalent linkage.Supporting information and the ORCID identification number(s) for the author(s) of this articlecan be found under: https://doi.

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Impregnation of sulfur into a 2D pyrene-based covalent organic framework for high-rate lithium–sulfur batteries

Abstract: By loading 70 wt% sulfur into a pyrene-based COF (Py-COF), we constructed Li–S batteries with high-rate capacity and long-term stability.

Cited by 124 publications

References 68 publications

Covalent Organic Frameworks: Chemical Approaches to Designer Structures and Built‐In Functions

Covalent Organic Frameworks: Chemical Approaches to Designer Structures and Built‐In Functions

Kovalente organische Gerüstverbindungen: chemische Ansätze für Designerstrukturen und integrierte Funktionen

Synergistic Effect of Covalent Bonding and Physical Encapsulation of Sulfur in the Pores of a Microporous COF to Improve Cycling Performance in Li‐S Batteries

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