Polydopamine-assisted in-situ formation of dense MOF layer on polyolefin separator for synergistic enhancement of lithium-sulfur battery

Wu, Xiuxiu; Zhou, Cheng; Dong, Chenxu; Shen, Chunli; Shuai, Binbin; Li, Cheng; Li, Yan; An, Qinyou; Xu, Xu; Mai, Liqiang

doi:10.1007/s12274-022-4423-2

Cited by 31 publications

(27 citation statements)

References 43 publications

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“…This was not surprising since the top layer of both separators was the COF-PDA modification layer. The O1s spectra (Figure h) of COF-PDA/PP and COF-PDA/SWCNT/PP could be fitted with two peaks at 532.5 eV for CO of COF and 530.7 eV for C–O of the quinone group in the intermediate 5,6-dihydroxyindoline . In addition, the N 1s spectra (Figure i) of COF-PDA/PP and COF-PDA/SWCNT/PP separators contained two signals, which were typical peaks for −C–N (399.9 eV) and −N–H (399.3 eV), thus demonstrating that the amino groups were connected to the aromatic ring and formed an COF structure.…”

Section: Resultsmentioning

confidence: 92%

Polydopamine-Assisted In Situ Formation of a Covalent Organic Framework on Single-Walled Carbon Nanotubes to Multifunctionalize Separators for Advanced Lithium–Sulfur Batteries

Han

Yang

Sun

et al. 2023

ACS Sustainable Chem. Eng.

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Lithium–sulfur (Li–S) batteries are regarded to be one of the most promising energy storage systems owing to their high energy density. Nevertheless, polysulfide shuttle and self-discharge severely hinder their commercial production. To address these issues, a novel multifunctional separator (COF-PDA/SWCNT/PP) is developed by modifying the commercial polypropylene (PP) separator via in situ growth of a covalent organic framework (COF) functional layer on the gutter layer made from single-walled carbon nanotubes (SWCNTs). SWCNTs in this configuration works as the gutter layer to reduce the pore size of the PP separator and offers lithium ion/electron transmission channels, while the COF-PDA barrier layer acts as a robust and efficient shield against polysulfide shuttling via both physical confinement and chemical interactions. Notably, the simultaneous generation of polydopamine (PDA) can get rid of defects in COFs by welding the COF nanoparticles, enhancing the mechanical property of the ultrathin COF-PDA layer. On the basis of the multilayer architecture, the modified separator not only effectively suppresses the shuttle effect but also realizes rapid lithium-ion transportation. As expected, the battery with a COF-PDA/SWCNT/PP separator presents a reversible specific capacity of 1031 mAh g–1 over 100 cycles at 0.2 C. Moreover, a high reversible capacity of 642 mAh g–1 over 500 cycles even at 1 C and outstanding anti-self-discharge behavior by a low capacity-attenuation of 4.6% over 7 days are also acquired for the cells implementing the as-developed separator. Hence, this proposed strategy of multilayer modified separators will open a new route to prepare high-performance Li–S batteries.

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Section: Resultsmentioning

confidence: 92%

Polydopamine-Assisted In Situ Formation of a Covalent Organic Framework on Single-Walled Carbon Nanotubes to Multifunctionalize Separators for Advanced Lithium–Sulfur Batteries

Han

Yang

Sun

et al. 2023

ACS Sustainable Chem. Eng.

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“…Next, ZIF-90 nanoparticles were grown on the PDA-coated MF sponge in situ, followed by post-synthetic modification via a condensation reaction between the amine groups of TFEA and the aldehyde groups of ZIF-90 [ 28 , 39 ]. Previous reports have confirmed that the coated PDA as the reactive intermediate layer can create a large number of active sites for the subsequent in situ growth of ZIF-90 nanoparticles, and that they can improve the bonding force between ZIF-90 particles and the substrate [ 45 , 48 , 49 ]. Wang et al [ 45 ] reported that polydopamine provides essential growth sites for ZIF-8 and ensures that ZIF-8 particles adhere firmly to the melamine sponge.…”

Section: Resultsmentioning

confidence: 99%

Eco-Friendly Fluorine Functionalized Superhydrophobic/Superoleophilic Zeolitic Imidazolate Frameworks–Based Composite for Continuous Oil–Water Separation

2023

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Superhydrophobic metal−organic framework (MOF)-based sponges have received increasing attention in terms of treating oil−water mixtures. However, highly fluorinated substances, commonly used as modifiers to improve the hydrophobicity of MOFs, have aroused much environmental concern. Developing a green hydrophobic modification is crucial in order to prepare superhydrophobic MOF-sponge composites. Herein, we report the preparation of a porous composite sponge via a polydopamine (PDA)-assisted growth of zeolitic imidazolate frameworks (ZIF-90) and eco-friendly hydrophobic short-chain fluorinated substances (trifluoroethylamine) on a melamine formaldehyde (MF) sponge. The composite sponge (F-ZIF-90@PDA-MF) exhibited superhydrophobicity (water contact angle, 153°) and superoleophilicity (oil contact angle, 0°), which is likely due to the combination of the low surface energy brought on by the grafted CF3 groups, as well as the rough surface structures that were derived from the in situ growth of ZIF-90 nanoparticles. F-ZIF-90@PDA-MF showed an excellent adsorption capacity of 39.4–130.4 g g−1 for the different organic compounds. The adsorbed organic compounds were easily recovered by physical squeezing. Continuous and selective separation for the different oil−water mixtures was realized by employing the composite sponge as an absorbent or a filter. The separation efficiency and flux reached above 99.5% and went up to 7.1 ×105 L m−2 h−1, respectively. The results illustrate that the superhydrophobic and superoleophilic F-ZIF-90@PDA-MF sponge has potential in the field of water−oil separation, especially for the purposes of large-scale oil recovery in a water environment.

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“…To improve MOF compatibility, intermediate materials like polydopamine (PDA) may be used. For example, Wu et al 286 used PDA as a glue between PP and ZIF-8. The zinc centers in the MOF had strong interactions with the catechol groups in the PDA for improved adhesion to the PP substrate.…”

Section: Organic Framework-based Modificationsmentioning

confidence: 99%

Recent advances in modified commercial separators for lithium–sulfur batteries

Kim

Adhikari³

et al. 2023

J. Mater. Chem. A

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Polydopamine-assisted in-situ formation of dense MOF layer on polyolefin separator for synergistic enhancement of lithium-sulfur battery

Cited by 31 publications

References 43 publications

Polydopamine-Assisted In Situ Formation of a Covalent Organic Framework on Single-Walled Carbon Nanotubes to Multifunctionalize Separators for Advanced Lithium–Sulfur Batteries

Polydopamine-Assisted In Situ Formation of a Covalent Organic Framework on Single-Walled Carbon Nanotubes to Multifunctionalize Separators for Advanced Lithium–Sulfur Batteries

Eco-Friendly Fluorine Functionalized Superhydrophobic/Superoleophilic Zeolitic Imidazolate Frameworks–Based Composite for Continuous Oil–Water Separation

Recent advances in modified commercial separators for lithium–sulfur batteries

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