Rational design of free-standing 3D porous MXene/rGO hybrid aerogels as polysulfide reservoirs for high-energy lithium–sulfur batteries

Song, Jianjun; Guo, Xin; Zhang, Jinqiang; Chen, Yi; Zhang, Chaoyue; Luo, Linqu; Wang, Fengyun; Wang, Guoxiu

doi:10.1039/c9ta00212j

Cited by 262 publications

(137 citation statements)

References 52 publications

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“…[117,118] Upon further modification, such kinds of materials are expected to serve as binders with high adhesion, conductivity, polysulfide adsorption, and catalytic characteristic. For example, MXene, which composes of a transition metal, C and/or N, and surface termination group such as O, OH, and/or F, is of great potential to be the conductive additive of binder.…”

Section: Binder Using Conductive 2d Materialsmentioning

confidence: 99%

Rational Design of Binders for Stable Li‐S and Na‐S Batteries

Guo

Zheng

2019

Adv Funct Materials

133

111

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Binders play a critical role in stabilizing the sulfur cathode of Li-S and Na-S batteries. Over the past decade, the design of binder molecules has gone through tremendous evolution from primarily maintaining the structural integrity of the electrode against volume change to rationally immobilizing polysulfide intermediate and facilitating electron/ion transport in the charge and discharge process. This article reviews the development of binder for Li-S and Na-S batteries from the perspective of molecular design, and comprehensively discusses the correlation between the functions of the binder molecules and the cell performance. It also points out the future challenge and the potential solutions to address them. Figure 2. Timeline of the development of binders in terms of specific functions in Li-S and Na-S batteries. The binder in Li-S batteries has experienced a remarkable evolution in terms of functions, from fundamental structural and mechanical stabilizer (linear, hybrid, [30] dendrimer, [31] and crossedlinked binder [32,33] ) to versatile functions of polysulfide immobilization (polymer with functional groups [34][35][36] or cation groups [37] ) and facilitation of electron transport on the basis of conductive polymer. [38,39] It opens up the research of multifunctional binder. The analogous development route in the binder is found in Na-S batteries. [40,41] Reproduced with permission. [30]

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Section: Binder Using Conductive 2d Materialsmentioning

confidence: 99%

Rational Design of Binders for Stable Li‐S and Na‐S Batteries

Guo

Zheng

2019

Adv Funct Materials

133

111

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“…Thus far, there are several methods for preparing MXene aerogels including (1) direct freeze-drying of MXene NC dispersions, 16,25,35,36 (2) calcination after freeze-drying of MXene NC dispersions, [37][38][39][40][41] and (3) freeze-drying of MXene hydrogels. 5,6,12,28,[42][43][44][45][46][47] In all these methods, the sublimation of ice crystals from frozen dispersions or hydrogels was necessary for obtaining MXene aerogels. Similar to hydrogels, the resultant micro/nanostructures and mechanical behavior of the obtained aerogels are influenced by the MXene concentration, polymeric molecular weight, freezing methods, and post-processing procedure.…”

Section: Derivatives Of Mxene Hydrogels: Aerogels Xerogels Organohymentioning

confidence: 99%

MXene hydrogels: fundamentals and applications

et al. 2020

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“…[ 17,29–34 ] For example, MXenes (M n +1 X n T x , where M = transition metal, X = carbon/nitrogen, n = 1, 2, and 3, and T x represents surface functional groups) modified separators have been proved to be effective in suppressing the shuttle effect due to their anisotropic shape and large 2D dimensions that increases the diffusion pathway of polysulfide/polyselenide species. [ 35–37 ] In addition, MXene shows strong adsorption to polysulfides due to the Lewis acid–base interaction between polysulfides and Ti sites, [ 38,39 ] which may also work for polyselenides. Nazar and co‐workers have shown that the surface environment on MXene enhances such Lewis acid–base chemisorption via thiosulfate formation.…”

Section: Introductionmentioning

confidence: 99%

Interface Engineering of MXene Composite Separator for High‐Performance Li–Se and Na–Se Batteries

Zhang

Guo

Xiong

et al. 2020

Advanced Energy Materials

Self Cite

108

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However, the development of metal-Se batteries has been blocked by the severe shuttle effect of polyselenides, particularly in ether-based electrolyte, where the polyselenides diffuse across the separator and react with the metal anode. [12,13] Tremendous efforts have been devoted to the design of advanced cathode host materials to mitigate the shuttle effect. [14,15] These designed cathode strategies include: employing porous carbon materials as the hosts; [7,[16][17][18][19] coating the cathode materials with graphene, metal oxide, or conductive polymers; [20][21][22][23][24] and heteroatoms doping. [25][26][27] However, these cathode engineering would inevitably reduce the mass ratio of selenium by introducing additional components, leading to decreased energy density. [28] Recently, functional separators have been prepared to inhibit the shuttle effect in Se-or S-based batteries. [17,[29][30][31][32][33][34] For example, MXenes (M n+1 X n T x , where M = transition metal, X = carbon/nitrogen, n = 1, 2, and 3, and T x represents surface functional groups) modified separators have been proved to be effective in suppressing the shuttle effect due to their anisotropic shape and large 2D dimensions that increases the diffusion pathway of polysulfide/polyselenide species. [35][36][37] In addition, MXene shows strong adsorption to polysulfides due to the Lewis acid-base interaction between polysulfides and Ti sites, [38,39] which may also work for polyselenides. Nazar and co-workers have shown that the surface environment on MXene enhances such Lewis acid-base chemisorption via thiosulfate formation. [38] However, this enhanced adsorption undergoes a two-step process with sluggish kinetics. Although the shuttle effect can be mitigated, the battery showed slow redox reaction, especially under high current densities. In addition, the MXene nanosheets also suffer from restacking and poor electrolyte affinities due to the van der Waals (vdW) forces and rich hydrophilic surface groups (OH and F), respectively. [40,41] It is well known that the hydrophilic groups on MXene have low compatibility to organic electrolyte. [42] The inferior separator-electrolyte contact will lead to a poor solid-electrolyte interface (SEI) and slow electrolyte infiltration process. [43] Herein, we developed a novel self-assembled cetrimonium bromide (CTAB)/carbon nanotube (CNT)/Ti 3 C 2 T x MXene Selenium (Se), due to its high electronic conductivity and high energy density, has recently attracted considerable interest as a cathode material for rechargeable Li/Na batteries. However, the poor cycling stability originating from the severe shuttle effect of polyselenides hinders their practical applications. Herein, highly stable Li/Na-Se batteries are developed using ultrathin (≈270 nm, loading of 0.09 mg cm −2 ) cetrimonium bromide (CTAB)/carbon nanotube (CNT)/Ti 3 C 2 T x MXene hybrid modified polypropylene (PP) (CCNT/ MXene/PP) separators. The hybrid separator can immobilize the polyselenides via enhanced Lewis acid-base interactions betwee...

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Rational design of free-standing 3D porous MXene/rGO hybrid aerogels as polysulfide reservoirs for high-energy lithium–sulfur batteries

Abstract: A Ti3C2Tx MXene/rGO hybrid aerogel is applied for the first time as a free-standing polysulfide reservoir to inhibit the shuttle effect and improve the overall performance of Li–S batteries.

Cited by 262 publications

References 52 publications

Rational Design of Binders for Stable Li‐S and Na‐S Batteries

Rational Design of Binders for Stable Li‐S and Na‐S Batteries

MXene hydrogels: fundamentals and applications

Interface Engineering of MXene Composite Separator for High‐Performance Li–Se and Na–Se Batteries

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