Co/Mon Invigorated Bilateral Kinetics Modulation for Advanced Lithium–Sulfur Batteries

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(13)

Published: Dec. 22, 2023

Abstract Sluggish sulfur redox kinetics and Li‐dendrite growth are the main bottlenecks for lithium–sulfur (Li–S) batteries. Separator modification serves as a dual‐purpose approach to address both of these challenges. In this study, Co/MoN composite is rationally designed applied modifier modulate electrochemical on sides cathode lithium anode. Benefiting from its adsorption‐catalysis function, decorated separators (Co/MoN@PP) not only effectively inhibit polysulfides (LiPSs) shuttle accelerate their conversion but also boost Li + flux, realizing uniform plating/stripping. The accelerated LiPSs excellent reversibility triggered by modified evidenced performance, in‐situ Raman detection theoretical calculations. batteries with Co/MoN@PP achieve high initial discharge capacity 1570 mAh g −1 at 0.2 C low decay rate 0.39%, transportation 1 mA cm −2 over 800 h. Moreover, areal 4.62 achieved under mass loadings 4.92 mg . This study provides feasible strategy rational utilization synergistic effect multifunctional microdomains solve problems anode S toward long‐cycling Li–S

Language: Английский

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Strengthened d‐p Orbital‐Hybridization of Single Atoms with Sulfur Species Induced Bidirectional Catalysis for Lithium–Sulfur Batteries

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(51)

Published: Aug. 17, 2023

Abstract Single‐atom catalysts (SACs) have been widely explored as additives to improve the performance of lithium–sulfur (Li–S) batteries, however, design highly catalytic and in‐depth knowledge structure–activity relationship SACs remains a huge challenge. Herein, electron redistribution Co site by introducing S atom replace N in first coordination shell is theoretically predicted enhance anchoring capability lithium polysulfides (LiPSs) simultaneously facilitate redox process Li–S due strengthened d‐p orbital hybridization between sulfur species compared with traditional CoN 4 architecture. Enlightened theoretical analysis, asymmetric (N, S) coordinated single atoms embedded on N, S‐doped hierarchically porous carbon (S‐Co‐SACs/NSC) precisely designed constructed high‐efficiency fixity catalyst for batteries. Therefore, battery S@S‐Co‐SACs/NSC cathode exhibits high areal capacity cycling stability. This work highlights vital function electronic structures promoting practical application

Language: Английский

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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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Tailoring First Coordination Sphere of Dual‐Metal Atom Sites Boosts Oxygen Reduction and Evolution Activities

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(28)

Published: Feb. 24, 2024

Abstract It is important to tune the coordination configuration of dual‐atom catalyst (DAC), especially in first sphere, render high intrinsic catalytic activities for oxygen reduction/evolution reactions (ORR/OER). Herein, a type atomically dispersed and boron‐coordinated DAC structure, namely, FeN 4 B‐NiN B dual sites, reported. In this incorporation boron into sphere /NiN atomic sites regulates its geometry electronic structure by forming “Fe‐B‐N” “Ni‐B‐N” bridges. The exhibits much enhanced ORR OER property compared ‐NiN counterparts. Density functional theory calculations reveal that boron‐induced charge transfer asymmetric distributions central Fe/Ni atoms optimize adsorption desorption behavior ORR/OER intermediates reduce activation energy potential‐determining step. Zinc‐air batteries employing cathode exhibit maximum power density (236.9 mW cm −2 ) stable cyclability up 1100 h. result illustrates pivotal role first‐coordination DACs tuning electrochemical conversion storage activities.

Language: Английский

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Materials Containing Single‐, Di‐, Tri‐, and Multi‐Metal Atoms Bonded to C, N, S, P, B, and O Species as Advanced Catalysts for Energy, Sensor, and Biomedical Applications

Advanced Science, Journal Year: 2024, Volume and Issue: 11(33)

Published: July 1, 2024

Abstract Modifying the coordination or local environments of single‐, di‐, tri‐, and multi‐metal atom (SMA/DMA/TMA/MMA)‐based materials is one best strategies for increasing catalytic activities, selectivity, long‐term durability these materials. Advanced sheet supported by metal atom‐based have become a critical topic in fields renewable energy conversion systems, storage devices, sensors, biomedicine owing to maximum utilization efficiency, precisely located centers, specific electron configurations, unique reactivity, precise chemical tunability. Several offer excellent support are attractive applications energy, medical research, such as oxygen reduction, production, hydrogen generation, fuel selective detection, enzymatic reactions. The strong metal–metal metal–carbon with metal–heteroatom (i.e., N, S, P, B, O) bonds stabilize optimize electronic structures atoms due interfacial interactions, yielding activities. These provide models understanding fundamental problems multistep This review summarizes substrate structure‐activity relationship different active sites based on experimental theoretical data. Additionally, new synthesis procedures, physicochemical characterizations, biomedical discussed. Finally, remaining challenges developing efficient SMA/DMA/TMA/MMA‐based presented.

Language: Английский

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Modulating the d-band center of single-atom catalysts for efficient Li2S2-Li2S conversion in durable lithium-sulfur batteries

Energy storage materials, Journal Year: 2024, Volume and Issue: 70, P. 103477 - 103477

Published: May 18, 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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Challenges and Solutions for Lithium–Sulfur Batteries with Lean Electrolyte

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(42)

Published: Aug. 27, 2023

Abstract Lithium–sulfur (Li–S) batteries have high theoretical energy density and are regarded as next‐generation batteries. However, their practical is much lower than the value. In previous studies, increase of areal capacity cathode decrease negative/positive ratio can be well achieved, yet shows no corresponding increase. The main reason difficulty in decreasing electrolyte dosage because lean inevitably causes deterioration reaction kinetics sulfur utilization. Thus, electrolyte/active material reported works usually higher 10 µL mg −1 , that Li‐ion (usually ≈0.3 for cathode). Although many focused on this topic, a systematic discussion still rare. This review systematically discusses key challenges solutions assembling high‐performance lean‐electrolyte Li–S First, arising from conditions discussed detail. Then, approaches recent progress to reduce usage, including optimization electrode porosity ion conduction, introduction electrocatalysis, exploration new active materials, regulation, Li metal protection reviewed. Finally, future research directions proposed.

Language: Английский

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Bidirectional Catalyst with Robust Lithiophilicity and Sulfiphilicity for Advanced Lithium–Sulfur Battery

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(44)

Published: July 5, 2023

Abstract The application of lithium–sulfur batteries (LSBs) is immensely impeded by notorious shuttle effect, sluggish redox kinetics, and irregular Li 2 S deposition, which result in large polarization rapid capacity decay. To obtain the LSBs with high energy density fast reaction herein, a heterostructure composed nitrogen‐deficient graphitic carbon nitride (ND‐ g ‐C 3 N 4 ) MgNCN fabricated via magnesiothermic denitriding technology. Lithophilic C abundant acts as conductive framework, together sulfiphilic MgNCN, lithium‐polysulfides (LiPSs) can be effectively captured followed regulated nucleation. Furthermore, oxidation conversion kinetics accelerated well. As expected, catalytic MgNCN/ND‐ interlayer exhibit remarkable electrochemical performance discharge 650 mAh −1 at C. Meanwhile, low decay 0.008% per cycle reached 1 after 400 cycles. Even areal sulfur loading 5.1 mg cm −2 , outstanding retention achieved 0.5 (64.18%) (90.46%). presented strategy unlocks new way for design highly efficient catalyst.

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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