Two fully conjugated covalent organic frameworks as anode materials for lithium ion batteries

Bai, Linyi; Gao, Qiang; Zhao, Yanli

doi:10.1039/c6ta06449c

Cited by 156 publications

(129 citation statements)

References 47 publications

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“…The E-TFPB-COF and E-TFPB-COF/MnO 2 composite electrode in this work exhibit excellent Li-storage performance in terms of high capacity and long cycle life compared with previous related COF-based [30][31][32][33][34][35][36][37][38] and MnO 2 -based organic-inorganic hybrid materials [45][46][47][48][49] for Li-ion batteries (Table S2, Supporting Information). Please note that in our previous work, [30] the COF@CNTs composite exhibited a large capacity of 1021 mAh g −1 after 500 cycles, but more than 300 cycles are needed to activate and very small reversible capacities of ≈230-440 mAh g −1 were delivered in the first 100 cycles.…”

Section: Wwwadvmatde Wwwadvancedsciencenewscommentioning

confidence: 93%

High‐Lithium‐Affinity Chemically Exfoliated 2D Covalent Organic Frameworks

et al. 2019

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Covalent organic frameworks (COFs) with reversible redox behaviors are potential electrode materials for lithium‐ion batteries (LIBs). However, the sluggish lithium diffusion kinetics, poor electronic conductivity, low reversible capacities, and poor rate performance for most reported COF materials limit their further application. Herein, a new 2D COF (TFPB‐COF) with six unsaturated benzene rings per repeating unit and ordered mesoporous pores (≈2.1 nm) is designed. A chemical stripping strategy is developed to obtain exfoliated few‐layered COF nanosheets (E‐TFPB‐COF), whose restacking is prevented by the in situ formed MnO2 nanoparticles. Compared with the bulk TFPB‐COF, the exfoliated TFPB‐COF exhibits new active Li‐storage sites associated with conjugated aromatic π electrons by facilitating faster ion/electron kinetics. The E‐TFPB‐COF/MnO2 and E‐TFPB‐COF electrodes exhibit large reversible capacities of 1359 and 968 mAh g−1 after 300 cycles with good high‐rate capability.

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Section: Wwwadvmatde Wwwadvancedsciencenewscommentioning

confidence: 93%

High‐Lithium‐Affinity Chemically Exfoliated 2D Covalent Organic Frameworks

et al. 2019

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“…These unique structural properties are not available in other porous materials, which are typically not π-conjugated, or conventional conjugated polymers, which are nonporous. [35][36][37][38][39] Enhancement in the following electrochemical properties over common RAPs are anticipated: i) fast charge transport in the preorganized pathways including both eclipsed stacked π columns and π-conjugated intralayer skeletons, ii) the porous structure of the RCMPs serving as electrolyte reservoir iii) open channels at the nanoscale providing facile, rapid, and short diffusion paths for ion mobility, and iv) the shape-persistent polymeric nature of RCMPs guaranteeing high (electro)chemical stabilities and inhibiting the potential dissolution of the electrode materials. [34] Due to their appealing properties, the application of redoxactive COFs and redox-active conjugated microporous polymers (RCMPs), which are synthesized by incorporation of redox-active building blocks, in electrochemical energy storage is becoming a fast growing field, although still in its infancy compared to conventional linear RAPs.…”

Section: Introductionmentioning

confidence: 99%

New Anthraquinone‐Based Conjugated Microporous Polymer Cathode with Ultrahigh Specific Surface Area for High‐Performance Lithium‐Ion Batteries

Molina

Patil

Ventosa

et al. 2019

Adv Funct Materials

102

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Redox-active conjugated microporous polymers (RCMPs) polymerized by conventional methods are commonly obtained as irregular insoluble solid particles making the electrode processing difficult. In this work, the synthesis of RCMP based on anthraquinone moieties (IEP-11) is developed via a two-step pathway combining miniemulsion and solvothermal techniques that results in polymer nanostructures that are much easier to disperse in solvents facilitating the fabrication of electrodes. Interestingly, this synthetic approach is also found to have an important impact on the inherent morphology of IEP-11 that exhibits a dual porosity combining micro and mesopores with a specific surface area as high as 2200 m 2 g −1 , which is one of the highest values reported for RCMPs. Moreover, the compactness of the electrodes is also improved, the resulting electrodes have triple the density than those obtained with conventional methods. Consequently, when these electrodes are tested as cathodes in Li-ion battery, they deliver high gravimetric capacities (≈100 mAh g −1 ) and extraordinary rate capability keeping 76% of discharge capacity when charged-discharged in only 12 min (@5 C). Moreover, the insoluble and robust conjugated porous structure provides IEP-11-E12 with an unprecedented cycling stability retain ≈90% and ≈60% of its initial capacity after 5000 (@2 C) and 80 000 cycles (@30 C), respectively.

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“…[354] Durch postsynthetische Modifikation erhielten Xu et al zwei [TEMPO] x -NiP-COFs mit x = 50 und 100 %B eladung durch redoxaktive 2,2,6,6-Te tramethylpiperidinyloxyl(TEMPO)-Einheiten sowie Kapazitäten von bis zu 150 Fg À1 . [356] Ionische COFs zeigten effizienten Li + -Tr ansport, [89] und konjugierte COFs wurden sowohl als Ka-thoden- [357] wie auch als Anodenmaterial [358] in Li + -Batterien eingesetzt. [356] Ionische COFs zeigten effizienten Li + -Tr ansport, [89] und konjugierte COFs wurden sowohl als Ka-thoden- [357] wie auch als Anodenmaterial [358] in Li + -Batterien eingesetzt.…”

Section: Angewandte Chemieunclassified

Kovalente organische Netzwerke und Käfigverbindungen: Design und Anwendungen von polymeren und diskreten organischen Gerüsten

Beuerle

Gole

2018

Angewandte Chemie

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Poröse organische Materialien sind eine aufstrebende Klasse funktionaler Nanostrukturen mit beispiellosen Eigenschaften. Die dynamisch‐kovalente Organisation kleiner organischer Bausteine unter thermodynamischer Kontrolle wird dabei für die verblüffend einfache Bildung komplexer Architekturen in Eintopfreaktionen genutzt. In diesem Aufsatz werden die grundlegenden Designprinzipien analysiert, die zur Bildung von entweder kovalenten organischen Netzwerken als kristalline poröse Polymere oder kovalenten organischen Käfigverbindungen als formgetreue molekulare Objekte führen. Konventionelle Synthesevorschriften und Analysemethoden werden neben ausgefeilteren Strategien, wie postsynthetische Modifizierungen oder Selbstsortierung, diskutiert. Gegebenenfalls werden die entsprechenden Eigenschaften und Besonderheiten von polymeren Netzwerken und diskreten organischen Käfigen verglichen. Darüber hinaus wird das Potenzial dieser Materialien für Anwendungen, von der Gasspeicherung über die Katalyse bis hin zur organischen Elektronik, erörtert.

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Two fully conjugated covalent organic frameworks as anode materials for lithium ion batteries

Abstract: Two fully conjugated covalent organic frameworks present high performance for both gas capture and Li ion storage, confirming their high potential in future Li–gas battery applications.

Cited by 156 publications

References 47 publications

High‐Lithium‐Affinity Chemically Exfoliated 2D Covalent Organic Frameworks

High‐Lithium‐Affinity Chemically Exfoliated 2D Covalent Organic Frameworks

New Anthraquinone‐Based Conjugated Microporous Polymer Cathode with Ultrahigh Specific Surface Area for High‐Performance Lithium‐Ion Batteries

Kovalente organische Netzwerke und Käfigverbindungen: Design und Anwendungen von polymeren und diskreten organischen Gerüsten

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