Boosting the Kinetics and Stability of Zn Anodes in Aqueous Electrolytes with Supramolecular Cyclodextrin Additives

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(25), P. 11129 - 11137

Published: June 14, 2022

The hydrophobic internal cavity and hydrophilic external surface of cyclodextrins (CDs) render promising electrochemical applications. Here, we report a comparative mechanistic study on the use CD molecules (α-, β-, γ-CD) as electrolyte additives for rechargeable Zn batteries. addition α-CD in aqueous ZnSO4 solution reduces nucleation overpotential activation energy plating suppresses H2 generation. Computational, spectroscopic, studies reveal that preferentially adsorbs parallel via secondary hydroxyl groups, suppressing water-induced side reactions hydrogen evolution hydroxide sulfate formation. Additionally, exterior with intense electron density simultaneously facilitates Zn2+ deposition alleviates dendrite A formulated 3 M + 10 mM enables homogenous plating/stripping (average Coulombic efficiency ∼ 99.90%) at 1 mA cm–2 Zn|Cu cells considerable capacity retention 84.20% after 800 cycles Zn|V2O5 full This provides insight into supramolecular macrocycles to modulate enhance interface stability kinetics metallic anodes battery chemistry.

Language: Английский

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P‐Doped NiTe₂ with Te‐Vacancies in Lithium–Sulfur Batteries Prevents Shuttling and Promotes Polysulfide Conversion

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(11)

Published: Jan. 12, 2022

Lithium-sulfur (Li-S) batteries have been hindered by the shuttle effect and sluggish polysulfide conversion kinetics. Here, a P-doped nickel tellurium electrocatalyst with Te-vacancies (P⊂NiTe2-x ) anchored on maize-straw carbon (MSC) nanosheets, served as functional layer (MSC/P⊂NiTe2-x separator of high-performance Li-S batteries. The P⊂NiTe2-x enhanced intrinsic conductivity, strengthened chemical affinity for polysulfides, accelerated sulfur redox conversion. MSC nanosheets enabled NiTe2 nanoparticle dispersion Li+ diffusion. In situ Raman ex X-ray absorption spectra confirmed that MSC/P⊂NiTe2-x restrained -based cell has cyclability 637 mAh g-1 at 4 C over 1800 cycles degradation rate 0.0139% per cycle, high performance 726 6 C, areal capacity 8.47 cm-2 under configuration 10.2 mg , low electrolyte/sulfur usage ratio 3.9. This work demonstrates vacancy-induced doping heterogeneous atoms enables durable electrochemistry can impact future electrocatalytic designs related to various energy-storage applications.

Language: Английский

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Metalated covalent organic frameworks: from synthetic strategies to diverse applications

Chemical Society Reviews, Journal Year: 2022, Volume and Issue: 51(15), P. 6307 - 6416

Published: Jan. 1, 2022

This review highlights the recent advances of metalated covalent organic frameworks, including synthetic strategies and applications, discusses current challenges future directions.

Language: Английский

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High‐Yield Carbon Dots Interlayer for Ultra‐Stable Zinc Batteries

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 12(26)

Published: May 7, 2022

Abstract The practical implementation of Zn metal anodes with high volumetric capacity is seriously plagued by the dendritic growth and accompanying interfacial parasitic reactions. Herein, yield carbon dots (CDs) abundant polar functional groups (CHO CN), as a artificial interface layer, are rationally designed to optimize electrolyte/Zn interfaces large‐scale viability. Of particular note, quantum‐sized CDs strong affinity can effectively ameliorate electric field distribution ensure that more 2+ adsorbed onto whole electrode, which beneficial for lowering barrier nucleation inducing homogeneous deposition, thus rendering dendrite‐free anode, extensively confirmed in situ optical microscope observation finite element simulation. Meanwhile, dense insoluble coating layer conducive arousing repulsion effect, good shielding active water SO 4 2− , eliminating water‐mediated reactions improving reaction kinetics. More importantly, electrochemically stable endows anode prolonged lifespan 3000 h at 1 mA cm −2 . This feasible efficient fabrication opens new avenue anodes.

Language: Английский

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Recent Progress for Concurrent Realization of Shuttle‐Inhibition and Dendrite‐Free Lithium–Sulfur Batteries

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(32)

Published: March 24, 2023

Lithium-sulfur (Li-S) batteries have become one of the most promising new-generation energy storage systems owing to their ultrahigh density (2600 Wh kg-1 ), cost-effectiveness, and environmental friendliness. Nevertheless, practical applications are seriously impeded by shuttle effect soluble lithium polysulfides (LiPSs), uncontrolled dendrite growth metallic Li, which result in rapid capacity fading battery safety problems. A systematic comprehensive review cooperative combination tackling fundamental problems terms cathode anode synchronously is still lacking. Herein, for first time, strategies inhibiting behavior dendrite-free Li-S simultaneously summarized classified into three parts, including "two-in-one" S-cathode Li-anode host materials toward full cell, "two birds with stone" modified functional separators, tailoring electrolyte stabilizing sulfur electrodes. This also emphasizes chemistry mechanism catalyst principles improving electrochemical performance; advanced characterization technologies monitor real-time LiPS evolution discussed detail. The problems, perspectives, challenges respect issues as well application proposed.

Language: Английский

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Covalent Organic Framework Based Lithium–Sulfur Batteries: Materials, Interfaces, and Solid‐State Electrolytes

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(10)

Published: Jan. 20, 2023

Abstract Lithium–sulfur batteries are recognized as one of the most promising next‐generation energy‐storage technologies owing to their high energy density and low cost. Nevertheless, shuttle effect polysulfide intermediates formation lithium dendrites principal reasons that restrict practical adoption current Li–S batteries. Adjustable frameworks, structural variety, functional adaptability covalent organic frameworks (COFs) have potential overcome issues associated with battery technology. Herein, a summary is presented emerging COF materials in addressing challenging problems terms sulfur hosts, modified separators, artificial solid electrolyte interphase layers, solid‐state electrolytes. This comprehensive overview focuses on design chemistry COFs used upgrade Furthermore, existing difficulties, prospective remedies, research directions for discussed, laying groundwork future advancements this class fascinating materials.

Language: Английский

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Ordered Mesoporous Carbon Grafted MXene Catalytic Heterostructure as Li-Ion Kinetic Pump toward High-Efficient Sulfur/Sulfide Conversions for Li–S Battery

ACS Nano, Journal Year: 2023, Volume and Issue: 17(2), P. 1653 - 1662

Published: Jan. 6, 2023

Lithium–sulfur (Li–S) batteries exhibit unparalleled theoretical capacity and energy density than conventional lithium ion batteries, but they are hindered by the dissatisfactory "shuttle effect" sluggish conversion kinetics owing to low transport kinetics, resulting in rapid fading. Herein, a catalytic two-dimensional heterostructure composite is prepared evenly grafting mesoporous carbon on MXene nanosheet (denoted as OMC-g-MXene), serving interfacial kinetic accelerators Li–S batteries. In this design, grafted can not only prevent stack of nanosheets with enhanced mechanical property also offer facilitated pump for accelerating diffusion. Meanwhile, exposed defect-rich OMC-g-MXene inhibits polysulfide shuttling chemical interactions between polysulfides thus simultaneously enhances electrochemical efficiency, fully investigated situ/ex situ characterizations. Consequently, cells pumps achieve high cycling (966 mAh g–1 at 0.2 C after 200 cycles), superior rate performance (537 5 C), an ultralow decaying 0.047% per cycle 800 cycles 1 C. Even employed sulfur loading 7.08 mg cm–2 under lean electrolyte, ultrahigh areal 4.5 acquired, demonstrating future practical application.

Language: Английский

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Covalent Organic Framework for Rechargeable Batteries: Mechanisms and Properties of Ionic Conduction

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 12(20)

Published: April 10, 2022

Abstract Ionic conduction plays a critical role in the process of electrode reactions and charge transfer kinetics rechargeable battery. Covalent organic frameworks (COFs) have emerged as an exciting new class ionic conductors, made great progress terms their application batteries. The unique features COFs, such well‐defined directional channels, functional diversity, structural robustness, endow COF‐based conductors with low diffusion energy barrier excellent temperature tolerance, which are much superior to classic inorganic or polymer conductors. Here, comprehensive analysis summary ion‐conducting behavior presented, design principles for COFs emphasized. Moreover, systematic overview recent development serving electrodes, separators, solid electrolytes, artificial interphase materials diverse battery applications, metal‐ion batteries, lithium metal lithium–sulfur lithium–CO 2 zinc–air etc., is proposed. This review expected provide theoretical guidance novel kinds conductor bearing intrinsic framework structures boost further research enthusiasm

Language: Английский

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Crystalline molybdenum carbide−amorphous molybdenum oxide heterostructures: In situ surface reconfiguration and electronic states modulation for Li−S batteries

Energy storage materials, Journal Year: 2022, Volume and Issue: 47, P. 345 - 353

Published: Feb. 15, 2022

Language: Английский

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Aqueous Zinc‐Iodine Batteries: From Electrochemistry to Energy Storage Mechanism

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(41)

Published: Sept. 1, 2023

Abstract As one of the most appealing energy storage technologies, aqueous zinc‐iodine batteries still suffer severe problems such as low density, slow iodine conversion kinetics, and polyiodide shuttle. This review summarizes recent development Zn─I 2 with a focus on electrochemistry underlying working mechanism. Starting from fundamentals batteries, zinc anode, well scientific existing in are introduced. The concrete strategies dealing cathode, electrolyte, separator challenges confronting elaborated well. To deepen understanding important findings mechanism different summarized detail. Finally, some guidelines directions for also provided. is expected to battery promote their practical applications future.

Language: Английский

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