A Separator with Double Coatings of Li₄Ti₅O₁₂and Conductive Carbon for Li‐S Battery of Good Electrochemical Performance

Advanced Science, Journal Year: 2023, Volume and Issue: 10(22)

Published: May 18, 2023

The market demand for energy pushes researchers to pay a lot of attention Li-S batteries. However, the 'shuttle effect', corrosion lithium anodes, and formation dendrites make poor cycling performances (especially under high current densities sulfur loading) batteries, which limit their commercial applications. Here, separator is prepared modified with Super P LTO (abbreviation SPLTOPD) through simple coating method. can improve transport ability Li+ cations, reduce charge transfer resistance. SPLTOPD effectively barrier pass-through polysulfides, catalyze reactions polysulfides into S2- , increase ionic conductivity also prevent aggregation insulating species on surface cathode. assembled batteries cycle 870 cycles at 5 C capacity attenuation 0.066% per cycle. When loading up 7.6 mg cm-2 specific discharge 0.2 reach 839 mAh g-1 anode after 100 does not show existence or layer. This work provides an effective way preparation separators

Language: Английский

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Accelerating catalytic conversion and chemisorption of polysulfides for advanced Li-S batteries from incorporating [email protected] hetero-nanocrystals into boron carbonitride nanotubes

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 678, P. 393 - 406

Published: Aug. 24, 2024

Language: Английский

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Recent Progress and Challenge in Metal–Organic Frameworks for Lithium–Sulfur Battery Separators

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: June 4, 2024

Abstract The separators used in lithium‐sulfur (Li–S) batteries play a crucial role their cycling performance and safety. Current commercial lack the ability to efficiently regulate polysulfide shuttling are prone thermal runaway at high temperatures. Recent studies have shown that multifunctional can boost electrochemical safety of Li–S batteries. Metal–organic frameworks (MOFs) emerged as promising materials for modifying due large specific surface areas highly ordered tunable nanopores. Herein, this review focuses on advancements developing MOFs, derivatives, MOFs‐based composites separator coatings address shortcomings mechanisms behind these modified separators, designed inhibit lithium dendrite growth, discussed, emphasizing relationship between structure performance. impact battery is also explored, aiming design suitable composite films high‐safety Furthermore, future perspectives outlined guide practical applications overcome remaining challenges associated with MOFs‐modified separators.

Language: Английский

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Safe, Facile, and Straightforward Fabrication of Poly(N‐vinyl imidazole)/Polyacrylonitrile Nanofiber Modified Separator as Efficient Polysulfide Barrier Toward Durable Lithium–Sulfur Batteries

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 9, 2024

Abstract Lithium–sulfur (Li–S) batteries are gaining tremendous attention as promising energy storage solutions due to their impressive density and the affordability of sulfur. However, practical use Li–S encounter major obstacles such polysulfide shuttle effect, which leads capacity loss decreased cycling stability. Herein, a polyethylene imidazole/polyacrylonitrile (PVIMPAN) nanofibers‐modified Celgard separator is constructed via facile electrospinning strategy used polysulfides barrier for batteries. The electron‐deficient imidazole groups introduced on surface PVIMPAN separators create that prevents shuttling extends cycle life. Additionally, developed exhibits significantly enhanced Li + transfer number 0.60, compared commercial (0.20). This enhancement can be attributed strong binding between bis(trifluoromethanesulphonyl)imide anion, leading improved plating stripping performance. Consequently, incorporating into enable achievement discharge 786.0 mAh g −1 with close 100% Coulombic efficiency after 500 cycles at 1C (25 °C). It believed this work provide valuable insights designing suitable robust metal–sulfur

Language: Английский

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Promoting overall sulfur redox kinetics for Li–S batteries via interfacial synergy in a NiS–NiTe₂ heterostructure-modified separator

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(18), P. 10737 - 10744

Published: Jan. 1, 2024

Lithium–sulfur (Li–S) batteries have garnered significant attention as a promising alternative to conventional lithium-ion due their high theoretical energy density.

Language: Английский

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Sustainable release of Mg(NO₃)₂ from a separator boosts the electrochemical performance of lithium metal as an anode for secondary batteries

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(15), P. 5461 - 5467

Published: Jan. 1, 2024

A separator, which can sustainably release Mg(NO 3 ) 2 into the electrolyte to ensure dendrite-free and long cycling of lithium metal batteries, is reported. This method simple efficient.

Language: Английский

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Sulfhydryl‐functionalized COF‐based electrolyte strengthens chemical affinity toward polysulfides in quasi‐solid‐state Li‐S batteries

Carbon Energy, Journal Year: 2024, Volume and Issue: 6(9)

Published: April 17, 2024

Abstract For lithium‐sulfur batteries (Li‐S batteries), a high‐content electrolyte typically can exacerbate the shuttle effect, while lean may lead to decreased Li‐ion conductivity and reduced catalytic conversion efficiency, so achieving an appropriate electrolyte‐to‐sulfur ratio (E/S ratio) is essential for improving battery cycling efficiency. A quasi‐solid (COF‐SH@PVDF‐HFP) with strong adsorption high was constructed in situ covalent organic framework (COF) growth on highly polarized polyvinylidene fluoride‐hexafluoropropylene (PVDF‐HFP) fibers. COF‐SH@PVDF‐HFP enables efficient low‐content liquid effectively suppresses effect. The results based Fourier‐transform infrared, Raman, UV–Vis, X‐ray photoelectron, density functional theory calculations confirmed of COF‐SH layer containing sulfhydryl imine groups lithium polysulfides. Lithium plating/stripping tests Li/COF‐SH@PVDF‐HFP/Li show excellent compatibility (5 mAh cm −2 1400 h). assembled Li‐S exhibits rate (2 C 688.7 g −1 ) cycle performance (at 2 568.8 capacity retention 77.3% after 800 cycles). This first report improve stability quasi‐solid‐state by reducing both E/S designing strategy sulfhydryl‐functionalized COF electrolytes. process opens up possibility solid‐state batteries.

Language: Английский

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Multifunctional Vanadium Nitride-Modified Separator for High-Performance Lithium–Sulfur Batteries

Nanomaterials, Journal Year: 2024, Volume and Issue: 14(8), P. 656 - 656

Published: April 10, 2024

Lithium-sulfur batteries (LSBs) are recognized as among the best potential alternative battery systems to lithium-ion and have been widely investigated. However, shuttle effect has severely restricted advancement in their practical applications. Here, we prepare vanadium nitride (VN) nanoparticles grown situ on a nitrogen-doped carbon skeleton (denoted VN@NC) derived from MAX phase use it separator modification materials for LSBs suppress optimize electrochemical performance. Thanks outstanding catalytic performance of VN superior electrical conductivity MAX, synergistic between two accelerates kinetics both lithium polysulfides (LiPSs) Li

Language: Английский

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Insight into the effect of N-doping level in N-doped carbons modified separator on improving the electrochemical performance of Li-S batteries

Electrochimica Acta, Journal Year: 2024, Volume and Issue: 496, P. 144487 - 144487

Published: May 25, 2024

Language: Английский

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Palygorskite‐Derived Ternary Fluoride with 2D Ion Transport Channels for Ampere Hour‐Scale Li‐S Pouch Cell with High Energy Density

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(4)

Published: Nov. 28, 2023

Abstract Although various excellent electrocatalysts/adsorbents have made notable progress as sulfur cathode hosts on the lithium‐sulfur (Li‐S) coin‐cell level, high energy density ( W G ) of practical Li‐S pouch cells is still limited by inefficient Li‐ion transport in thick under low electrolyte/sulfur (E/S) and negative/positive (N/P) ratios, which aggravates shuttle effect sluggish redox kinetics. Here a new ternary fluoride MgAlF 5 ·2H 2 O with ultrafast ion conduction–strong polysulfides capture integration developed. has an inverse Weberite‐type crystal framework, corner‐sharing [AlF 6 ]–[MgF 4 (H O) ] octahedra units extend to form two‐dimensional channels along [100] [010] directions, respectively. Applied host, lithiated LiTFSI (lithium salt electrolyte) acts fast ionic conductor ensure efficient accelerate kinetics S loadings E/S N/P. Meanwhile, strong polar captures chemisorption suppress effect. Therefore, 1.97 A h‐level cell achieves 386 Wh kg −1 . This work develops new‐type conductor, provides unique insights for designing cells.

Language: Английский

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