Covalent Organic Frameworks-Enhanced Ionic Conductivity of Polymeric Ionic Liquid-Based Ionic Gel Electrolyte for Lithium Metal Battery

Wang, Zhennan; Zheng, Weizhong; Sun, Weizhen; Zhao, Ling; Wang, Yuan

doi:10.1021/acsaem.0c03229

Cited by 34 publications

(31 citation statements)

References 68 publications

(108 reference statements)

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“…[15] MOFs [18] and COFs [19] used in lithium batteries reported in literature are normally powders,t hen compressed into pellets as solid or quasi-solid electrolytes in lithium batteries.S uch traditional form lacks sufficient flexibility and requires desired processability.H ence,i ti s significant to explore other forms of COFs materials,such as flexible gel-state.H owever, the gelation of COFs remains unexploited. [20] In this contribution, we developed ab ottom-up strategy for the gelation of COF materials by means of ageneral sidechain engineering process.T his method takes advantages of large and soft branched alkyl side chains as internal plasticizers. [21] Them orphology of COF-Gel could be regulated effectively by designing monomers with different lengths of branched alkyl side chains rationally.F urther, the macroprofile of COFs turns out from powder to powder-gel mixed, and finally to gel state.T his method accomplished COFs at room temperature,d ifferent from the traditional solvothermal process.T he relations between COF-gel structures and properties were further investigated.…”

Section: Introductionmentioning

confidence: 99%

Highly Processable Covalent Organic Framework Gel Electrolyte Enabled by Side‐Chain Engineering for Lithium‐Ion Batteries

et al. 2021

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Although covalent organic frameworks (COFs) with agraphene-like structure present unique chemical and physical properties,t hey are essentially insoluble and infusible crystalline powders with poor processability,h indering their further practical applications.H ow to improve the processability of COF materials is am ajor challenge in this field. In this contribution, we proposed ag eneral side-chain engineering strategy to construct ag el-state COF with high processability. This method takes advantages of large and soft branched alkyl side chains as internal plasticizers to achieve the gelation of the COF.W es ystematically studied the influence of the length of the side chain on the COF gel formation. Benefitting from their machinability and flexibility,this novel COF gel can be easily processed into gel-type electrolytes with specific shape and thickness,w hich were further applied to assemble lithium-ion batteries that exhibited high cycling stability.

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Section: Introductionmentioning

confidence: 99%

Highly Processable Covalent Organic Framework Gel Electrolyte Enabled by Side‐Chain Engineering for Lithium‐Ion Batteries

et al. 2021

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“…Sun and co‐workers added TPBDMTPCOF into the polymeric ionic liquid/ionic liquid (PIL/IL)‐based ionic gel electrolyte (IGE), and the IL could infiltrate the pore of COF as a solid electrolyte for lithium metal batteries (Figure 10b). [ 118 ] The strong interaction between the wall of TPBDMTPCOF and ILs ensured the high loading amount of ILs. The enhanced ionic conductivity could be attributed to the higher content of ILs, the breaking of Coulombic ordering of ILs, and the faster diffusion of the anions.…”

Section: Design Principles For Ion‐conducting Cofsmentioning

confidence: 99%

Covalent Organic Framework for Rechargeable Batteries: Mechanisms and Properties of Ionic Conduction

Cao

Wang

et al. 2022

Advanced Energy Materials

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The ionic conduction plays an important role in the charging/discharging kinetics in rechargeable batteries, mainly including the steps of diffusion in the electrodes, transport in the electrolytes, and permeation through the electrode/electrolyte interphases. [8][9][10] Generally, the ionic transport is a critical control step in the electrochemical reactions, because it is much slower kinetics than electron transport. [8,11] Thus, regulating the ion-transport behavior is very vital to achieve fast-charging secondary batteries. [6,12] Mechanism exploration and novel material design become two important strategies to tackle the sluggish ionconduction kinetics. [13][14][15][16][17] In the secondary battery, the environment of ionic conduction can be roughly divided into liquid electrolytes and solid conductors. The ionic diffusion in the liquid electrolytes can be very fast. However, the flammability of organic solvents and the instability of salts (such as LiPF 6 ) at elevated temperature limit its commercial application. [18,19] The solid conductor is a safer choice to replace the current liquid electrolyte, but still suffers a serious impediment of low ionic conductivity. [20,21] Recently, covalent organic frameworks (COFs), an emerging type of crystalline porous materials, are considered to be a potential solid conductor. [22,23] Depending on the topological establishment of building blocks, COFs are classified into 2D COFs and 3D COFs. Unless otherwise noted, the COFs in this review specifically refer to 2D COFs. 2D COFs typically crystallize as stacked sheets through the π-π interaction between adjacent monolayers, meanwhile the organic units are connected by the covalent bond to form reticular framework with periodic channel structure. [24][25][26][27] Based on the nature of synthetic reactions, COFs have been synthesized with boroxine, boronate ester, borosilicate, triazine, imine, hydrazone, borazine, imide, spiroborate, amide linkages, etc. [24,25] In addition, based on the symmetry of the monomers, COFs can be designed in various topologies, such as tetragonal, hexagonal, rhombic, and trigonal. [24,25] Over the recent decades, a variety of synthetic approaches have been developed to prepare COFs, such as solvothermal synthesis, microwave synthesis, ionothermal synthesis, mechanochemical synthesis, and interfacial synthesis. [24,25] Among them, the solvothermal synthesis under a sealed vessel with a suitable temperature can produce highly crystalline COFs, but this method always needs a long Ionic conduction plays a critical role in the process of electrode reactions and the charge transfer kinetics in a rechargeable battery. Covalent organic frameworks (COFs) have emerged as an exciting new class of ionic conductors, and have made great progress in terms of their application in rechargeable batteries. The unique features of COFs, such as well-defined directional channels, functional diversity, and structural robustness, endow COF-based conductors with a low ionic diffusion energy barrier and excellent t...

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“…Clearly, in the past few years, COFs have been largely studied as Li + conductors or solid-state electrolytes. Their application in polymeric ionic liquid-based ionic gel electrolyte has also been reported recently . However, most previous research only studied their behaviors in conducting Li + and did not pay enough attention to the application of COF-based solid-state electrolytes in solid-state Li metal batteries, which was critical for evaluating the practical application ability. − In addition, the stability on the interface between Li metal and COF-based solid-state electrolyte should also be carefully investigated.…”

Section: Application Of Cofs and Their Derivatives In Stable LI Metal...mentioning

confidence: 99%

Covalent Organic Frameworks and Their Derivatives for Better Metal Anodes in Rechargeable Batteries

et al. 2021

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Metal anodes based on a plating/stripping electrochemistry such as metallic Li, Na, K, Zn, Ca, Mg, Fe, and Al are recognized as promising anode materials for constructing next-generation high-energy-density rechargeable metal batteries owing to their low electrochemical potential, high theoretical specific capacity, superior electronic conductivity, etc. However, inherent issues such as high chemical reactivity, severe growth of dendrites, huge volume changes, and unstable interface largely impede their practical application. Covalent organic frameworks (COFs) and their derivatives as emerging multifunctional materials have already well addressed the inherent issues of metal anodes in the past several years due to their abundant metallophilic functional groups, special inner channels, and controllable structures. COFs and their derivatives can solve the issues of metal anodes by interfacial modification, homogenizing ion flux, acting as nucleation seeds, reducing the corrosion of metal anodes, and so on. Nevertheless, related reviews are still absent. Here we present a detailed review of multifunctional COFs and their derivatives in metal anodes for rechargeable metal batteries. Meanwhile, some outlooks and opinions are put forward. We believe the review can catch the eyes of relevant researchers and supply some inspiration for future research.

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Covalent Organic Frameworks-Enhanced Ionic Conductivity of Polymeric Ionic Liquid-Based Ionic Gel Electrolyte for Lithium Metal Battery

Cited by 34 publications

References 68 publications

Highly Processable Covalent Organic Framework Gel Electrolyte Enabled by Side‐Chain Engineering for Lithium‐Ion Batteries

Highly Processable Covalent Organic Framework Gel Electrolyte Enabled by Side‐Chain Engineering for Lithium‐Ion Batteries

Covalent Organic Framework for Rechargeable Batteries: Mechanisms and Properties of Ionic Conduction

Covalent Organic Frameworks and Their Derivatives for Better Metal Anodes in Rechargeable Batteries

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