Dual‐Functional V₂C MXene Assembly in Facilitating Sulfur Evolution Kinetics and Li‐Ion Sieving toward Practical Lithium–Sulfur Batteries

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(26)

Published: March 19, 2023

Abstract Lithium–sulfur (Li–S) batteries are considered as one of the most promising candidates to achieve an energy density 500 Wh kg⁻ 1 . However, challenges shuttle effect, sluggish sulfur conversion kinetics, and lithium‐dendrite growth severely obstruct their practical implementation. Herein, multiscale V 2 C MXene (VC) with a spherical confinement structure is designed high‐efficiency bifunctional promotor for evolution lithium species in Li–S batteries. Combining synchrotron X‐ray 3D nano‐computed tomography (X‐ray nano‐CT), small‐angle neutron scattering (SANS), first‐principle calculations, it revealed that activity VC can be maximized by tuning scale, as‐attained functions conducted follows: (i) acts efficient polysulfide (LiPS) scavenger due large number active sites; (ii) exhibits significantly improved electrocatalytic function Li S nucleation decomposition reaction kinetics owing scale effect; (iii) regulate dynamic behavior Li‐ions thus stabilize plating/stripping effectively on account unique ion‐sieving effect.

Language: Английский

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Fundamental, application and opportunities of single atom catalysts for Li-S batteries

Energy storage materials, Journal Year: 2022, Volume and Issue: 55, P. 322 - 355

Published: Dec. 5, 2022

Language: Английский

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Applications of MXene‐Based Single‐Atom Catalysts

Small Structures, Journal Year: 2023, Volume and Issue: 4(7)

Published: Jan. 27, 2023

Single‐atom catalysts (SACs) consist of isolated metal sites on the support through stable coordination bond, which usually have high catalytic activity and selectivity. With large surface area electron tunability, metallic carbides, nitrides, or carbonic nitrides (MXenes) are suitable carriers for supporting single‐metal atoms. The abundant surface‐functional groups vacancy defects MXenes ideal anchoring Herein, advanced synthesis characterization methods MXene‐based SACs first introduced. Three strategies (adsorption at functional groups, vacancies, terminating group vacancies) appear to be feasible in ensuring non‐aggregation atoms, attributed strong bonding between atoms carrier. applications electrocatalysis (including hydrogen evolution reaction, oxygen reduction carbon dioxide nitrogen reaction), energy storage Li‐ion batteries, metal–air supercapacitors), sensors gas biological sensors) fundamentally reviewed. Finally, own insight current challenges prospects is presented.

Language: Английский

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Asymmetrically Coordinated Cu–N₁C₂ Single‐Atom Catalyst Immobilized on Ti₃C₂T_x MXene as Separator Coating for Lithium–Sulfur Batteries

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(20)

Published: April 9, 2023

Abstract Lithium–sulfur (Li–S) batteries are receiving great attention owing to their large theoretical energy density, but the shuttle effect and sluggish kinetic conversion of lithium polysulfides (LiPSs) seriously restrict practical applications. Herein, various metal single‐atom catalysts immobilized on nitrogen‐doped Ti 3 C 2 T x ( M SA/N‐Ti , = Cu, Co, Ni, Mn, Zn, In, Sn, Pb, Bi) successfully prepared by a neoteric vacancy‐assisted strategy, applied as polypropylene (PP) separator coatings facilitate fast redox adsorption LiPSs for boosting Li–S batteries. Of particular note, among s, Cu /PP exhibits amazing properties, involving excellent rate performance (925 mAh g −1 at C), superb cycling stability over 1000 cycles, ultra‐high sulfur utilization even loadings (7.19 mg cm −2 ; an areal capacity 5.28 ). X‐ray absorption fine spectroscopy density functional theory calculations reveal that asymmetrically coordinated Cu–N 1 moieties act active sites, which possess higher binding larger electron cloud with than pristine facilitating effectively. This work may provide new insights into single atom‐decorated ultrathin 2D materials enhancing electrochemical advanced storage conversion.

Language: Английский

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Rechargeable Metal-Sulfur Batteries: Key Materials to Mechanisms

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(8), P. 4935 - 5118

Published: April 10, 2024

Rechargeable metal-sulfur batteries are considered promising candidates for energy storage due to their high density along with natural abundance and low cost of raw materials. However, they could not yet be practically implemented several key challenges: (i) poor conductivity sulfur the discharge product metal sulfide, causing sluggish redox kinetics, (ii) polysulfide shuttling, (iii) parasitic side reactions between electrolyte anode. To overcome these obstacles, numerous strategies have been explored, including modifications cathode, anode, electrolyte, binder. In this review, fundamental principles challenges first discussed. Second, latest research on is presented discussed, covering material design, synthesis methods, electrochemical performances. Third, emerging advanced characterization techniques that reveal working mechanisms highlighted. Finally, possible future directions practical applications This comprehensive review aims provide experimental theoretical guidance designing understanding intricacies batteries; thus, it can illuminate pathways progressing high-energy-density battery systems.

Language: Английский

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Effect of Heterostructure‐Modified Separator in Lithium–Sulfur Batteries

Small, Journal Year: 2023, Volume and Issue: 19(42)

Published: June 9, 2023

Lithium-sulfur (Li-S) batteries with high energy density and low cost are the most promising competitor in next generation of new reserve devices. However, there still many problems that hinder its commercialization, mainly including shuttle soluble polysulfides, slow reaction kinetics, growth Li dendrites. In order to solve above issues, various explorations have been carried out for configurations, such as electrodes, separators, electrolytes. Among them, separator contact both anode cathode is a particularly special position. Reasonable design-modified material can key problems. Heterostructure engineering modification method combine characteristics different materials generate synergistic effect at heterogeneous interface conducive Li-S electrochemical behavior. This review not only elaborates role heterostructure-modified separators dealing problems, but also analyzes improvement wettability thermal stability by heterostructure materials, systematically clarifies advantages, summarizes some related progress recent years. Finally, future development direction heterostructure-based given.

Language: Английский

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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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Bi‐Metallic Coupling‐Induced Electronic‐State Modulation of Metal Phosphides for Kinetics‐Enhanced and Dendrite‐Free Li–S Batteries

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(14)

Published: Jan. 17, 2023

Abstract Lithium–sulfur (Li–S) batteries are considered as next‐generation promising batteries, yet suffer from severe capacity decay and low‐rate capability. Transition metal compounds can solve these problems due to their unique electronic band structure, good chemical adsorption ability, exceptional catalytic Unraveling the essence of states fundamentally guide structure design promote Li–S battery performance. Herein, bi‐metallic coupling‐induced electronic‐state modulation phosphides is reported for kinetics‐enhanced dendrite‐free batteries. Bimetallic nanoparticles‐anchored N, P‐co‐doped porous carbons (NiCoP–NPPC) facilely constructed via a laser‐induced micro‐explosion strategy. Theoretical calculations reveal that be modulated NiCo coupling, leading lower polysulfides/Li + diffusion conversion barriers. As result, assembled full cells based on NiCoP–NPPC exhibit greatly improved (1150 mAh g ‐1 at 0.5 C) cycle stability (84.3% retention after 1000 cycles). Furthermore, they operated even under lean electrolyte (5.2 µL mg ) with high sulfur loading (6.9 cm ‐2 ), achieving areal 6.8 C. This study demonstrates an effective approach developing high‐performance

Language: Английский

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Tuning the Local Coordination of CoP_1–xS_x between NiAs- and MnP-Type Structures to Catalyze Lithium–Sulfur Batteries

ACS Nano, Journal Year: 2023, Volume and Issue: 17(3), P. 3143 - 3152

Published: Jan. 30, 2023

The slow conversion and rapid shuttling of polysulfides remain major challenges that hinder the practical application lithium-sulfur (Li-S) batteries. Efficient catalysts are needed to accelerate suppress shuttling. However, lack a rational understanding catalysis poses obstacles design catalysts, thereby limiting development Li-S Herein, we theoretically analyze modulation electronic structure CoP1-xSx caused by NiAs-to-MnP-type transition its influence on catalytic activity. We found interacting d-orbitals active metal sites play determining role in adsorption catalysis, optimal dz2-, dxz-, dyz-orbitals an appropriately distorted five-coordinate pyramid enable higher activity compared with their parent structures. Finally, rationally designed S were electrospun into carbonized nanofibers form nanoreactor chains for use as cathodes. resultant batteries exhibited superior properties over 1000 cycles only decay rate 0.031% per cycle demonstrated high capacity 887.4 mAh g-1 at loading 10 mg cm-2. structural bonding analyses this study provide powerful approach catalysts.

Language: Английский

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Boosting Charge Transport and Catalytic Performance in MoS₂ by Zn²⁺ Intercalation Engineering for Lithium–Sulfur Batteries

ACS Nano, Journal Year: 2024, Volume and Issue: 18(3), P. 2017 - 2029

Published: Jan. 9, 2024

Transition metal dichalcogenides (TMDs) have been widely studied as catalysts for lithium–sulfur batteries due to their good catalytic properties. However, poor electronic conductivity leads slow sulfur reduction reactions. Herein, a simple Zn2+ intercalation strategy was proposed promote the phase transition from semiconducting 2H-phase metallic 1T-phase of MoS2. Furthermore, between layers can expand interlayer spacing MoS2 and serve charge transfer bridge longitudinal transport along c-axis electrons. DFT calculations further prove that Zn-MoS2 possesses better ability stronger adsorption capacity. At same time, exhibits excellent redox electrocatalytic performance conversion decomposition polysulfides. As expected, battery using Zn0.12MoS2-carbon nanofibers (CNFs) cathode has high specific capacity (1325 mAh g–1 at 0.1 C), rate (698 3 outstanding cycle (it remains 604 after 700 cycles with decay 0.045% per cycle). This study provides valuable insights improving batteries.

Language: Английский

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