Development of Synergistically Efficient Ni–Co Pair Catalytic Sites for Enhanced Polysulfide Conversion in Lithium–Sulfur Batteries

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(37)

Published: March 29, 2024

Abstract The performance of Lithium–sulfur (Li–S) batteries is constrained by the migration lithium polysulfide (LiPS), slow conversion LiPS, and significant reaction barrier encountered during precipitation/dissolution Li 2 S throughout discharge/charge cycle. In this contribution, study presents Ni–Co dual‐atom catalytic sites on hollow nitrogen‐doped carbon (NiCoNC). Theoretical calculations experimental data reveal that catalysts (DACs) accelerate kinetic LiPSs facilitate formation/decomposition discharging charging, which minimizes LiPS migration. Consequently, utilization S/NiCoNC cathodes manifests a substantial initial capacity 1348.5 mAh g −1 at 0.1 C, exceptional cycling stability with an average degradation rate 0.028% per cycle over 900 cycles 0.5 noteworthy capability 626 C. Electrodes higher sulfur loading 4.5 mg cm −2 low electrolyte/sulfur ratio 8 µL exhibit specific capacities up to 1236 as well retention 494.2 after 200 0.2 This effectively showcases potential DACs for cathodes, thereby enhancing overall Li–S batteries.

Language: Английский

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MoC‐MoSe₂ Heterostructures as Multifunctional Catalyst Toward Promoting the Stepwise Polysulfide Conversion for Lithium‐Sulfur Batteries

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(33)

Published: April 10, 2024

Abstract Catalyzing polysulfides conversion for lithium‐sulfur batteries is an efficient strategy to overcome the sluggish kinetics of as well its serious shuttling effect. Due multistep and complicated phase transformation sulfur species, monofunctional catalyst can hardly promote overall redox process. Herein, a molybdenum‐based heterostructure proposed, that facilitates entire reduction process by tandemly catalyzing liquid‐liquid liquid‐solid conversion. It uncovered MoC physiochemically immobilizes soluble long‐chain polysulfide accelerates between S 8 Li 2 4 through adsorbing extending S─S bond distance. Then, precipitation enhanced facilitating migration from MoSe . This driven internal electric field at heterogeneous interface low diffusion energy barrier on Li2S Moreover, MoC‐MoSe exhibits smallest degree disproportionation throughout Consequently, cell with /C/S cathode delivers initial discharge‐specific capacity 841.1 mAh g −1 long‐term cycling stability attenuation rate 0.08% per cycle 1.0 C. work presents novelty view design rational multifunction sequentially accelerating stepwise polysulfides.

Language: Английский

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Physical Field Effects to Suppress Polysulfide Shuttling in Lithium–Sulfur Battery

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

Published: Oct. 14, 2024

Lithium-sulfur batteries (LSB) with high theoretical energy density are plagued by the infamous shuttle effect of lithium polysulfide (LPS) and sluggish sulfur reduction/evolution reaction. Extensive research is conducted on how to suppress effects, including physical structure confinement engineering, chemical adsorption strategy, design redox catalysts. Recently, rational mitigate effects enhance reaction kinetics based field has been widely studied, providing a more fundamental understanding interactions species. Herein, focused their methods mechanisms interaction summarized systematically LPS. Overall, working principle LSB system, origin effect, kinetic trouble in briefly described. Then, mechanism application materials concepts external field-assisted elaborated, electrostatic force, built-in electric field, spin state regulation, strain magnetic photoassisted other strategies pivotally elaborated discussed. Finally, potential directions enhancing performance weakening high-energy anticipated.

Language: Английский

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Oxygen Bridges of CoTe₂/Co─O─NC Enhancing Adsorption‐Catalysis of Polysulfide for Stable Lithium–Sulfur Batteries

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 15, 2025

Abstract Lithium–sulfur batteries are regarded as candidates for next‐generation energy storage systems, but their slow reaction kinetics and shuttle effect severely hinder practical applications. One of the key solutions is to design apply efficient, highly stable, long‐life catalysts. Herein, a nanostructured CoTe 2 /Co─O─NC electrocatalytic material developed achieve effective adsorption bidirectional catalytic conversions lithium polysulfides (LiPSs). Results show that oxygen bridges (Co─O─C) formed in not only effectively shift d‐band center cobalt near its Fermi level enhance LiPSs also strengthen built‐in electric fields /Co heterojunctions reduce barrier sulfur conversion. Deposition dissociation Li S significantly enhanced during charging/discharging processes. Durability active catalyst improved, rapid cross‐interfacial charge transfer achieved. The synthesized S/CoTe cathode exhibits an initial capacity 1498 mAh g −1 at 0.1 C, decay rate over 500 cycles 0.5 C 0.046%. Li─S pouch cells using density 368 Wh kg areal 7.7 cm −2 loading 6.7 mg , with electrolyte/sulfur ratio 4 µL .

Language: Английский

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Boosting Polysulfide Conversion on Fe‐Doped Nickel Diselenide Toward Robust Lithium–Sulfur Batteries

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 17, 2025

Abstract Sulfur offers a high‐energy‐density, low‐cost, and sustainable alternative to traditional battery cathodes, but its practical use is limited by sluggish uneven reaction polysulfide dissolution, necessitating electrocatalytic additives enhance conversion efficiency. Generating unpaired spin electrons has proven effective in enhancing performance Co‐based electrocatalysts. These increase adsorption weakening S─S bonds, facilitating their cleavage during sulfur reduction reactions. This work extends the strategy Fe–Ni‐based catalysts. The synthesis of NiSe 2 Fe‐doped particles reported investigate impact Fe doping on electronic structure, catalytic activity, introduced as coating cathode side Li–S (LSB) separator. Experimental analyses first‐principles calculations reveal that Fe‐rich cores surface density states at Fermi level introduce electrons, boosting LiPS conversion. synergistic effects significantly improve performance, cycling stability, overall LSB cells. Specifically, cells based ‐based separators achieve specific capacities 1483 mAh g⁻¹ 0.1C 1085 1C, along with remarkable retaining 84.4% capacity after 800 cycles. High sulfur‐loading tests further validate multifunctional membrane's effectiveness, showing significant retention reduced loss.

Language: Английский

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Tuning Redox Behavior of Sulfur Cathodes Via Ternary‐Coordinated Single Fe Atom in Lithium‐Sulfur Batteries

Small, Journal Year: 2024, Volume and Issue: 20(24)

Published: Jan. 4, 2024

Abstract Modulating the coordination configuration of single Fe atom has been an efficient strategy to strengthen redox dynamics for lithium‐sulfur batteries (LSBs) but remains challenging. Herein, is functioned with nitrogen and carbon atoms in first shell, simultaneously, oxidized sulfur (─SOx) second which presents a lower antibonding state well address activity cathodes. In ternary‐coordinated catalyst (FeN 2 C –SOx–NC), binary structure FeN provides Fe–S bonding strength d – p orbital hybridization, obviously optimizes adsorption desorption behavior species during reduction oxidation reaction processes. Simultaneously, ─SOx redistributes electron density coordinating atoms, possesses high electron‐withdrawing ability develops electrocatalytic activity. As result, cathodes –SOx–NC present excellent high‐rate cyclic performance, accompanied by capacity decay rate 0.08% per cycle 500 cycles at 4.0 . This study new insights optimizing LSBs atomic level.

Language: Английский

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Progress in the advancement of atomically dispersed catalysts for enhanced performance lithium-sulfur batteries

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 488, P. 150719 - 150719

Published: March 29, 2024

Language: Английский

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Atom-Dominated Relay Catalysis of High-Entropy MXene Promotes Cascade Polysulfide Conversion for Lithium-Sulfur Batteries

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

The high-entropy TiVNbMoC 3 MXene, with its atom-dominated relay catalysis effect and resilient lattice configuration, promotes a cascade of sulfur conversions guides uniform Li + deposition, enabling shuttle-free dendrite-free Li–S batteries.

Language: Английский

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Redox mediators for high performance lithium-sulfur batteries: Progress and outlook

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 495, P. 153648 - 153648

Published: July 1, 2024

Language: Английский

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Construction and catalysis role of a kinetic promoter based on lithium-insertion technology and proton exchange strategy for lithium-sulfur batteries

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 670, P. 519 - 529

Published: May 18, 2024

Language: Английский

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