Dynamic Intercalation–Conversion Site Supported Ultrathin 2D Mesoporous SnO₂/SnSe₂ Hybrid as Bifunctional Polysulfide Immobilizer and Lithium Regulator for Lithium–Sulfur Chemistry

ACS Nano, Journal Year: 2022, Volume and Issue: 16(7), P. 10783 - 10797

Published: June 27, 2022

The practical application of lithium-sulfur batteries is impeded by the polysulfide shuttling and interfacial instability metallic lithium anode. In this work, a twinborn ultrathin two-dimensional graphene-based mesoporous SnO2/SnSe2 hybrid (denoted as G-mSnO2/SnSe2) constructed immobilizer regulator for Li-S chemistry. as-designed G-mSnO2/SnSe2 possesses high conductivity, strong chemical affinity (SnO2), dynamic intercalation-conversion site (LixSnSe2), inhibits shuttle behavior, provides rapid Li-intercalative transport kinetics, accelerates LiPS conversion, decreases decomposition energy barrier Li2S, which evidenced ex situ XAS spectra, in Raman, XRD, DFT calculations. Moreover, with lithiophilic characteristics enables homogeneous Li-ion deposition Li dendrite growth. Therefore, separator achieve favorable electrochemical performance, including sulfur utilization (1544 mAh g-1 at 0.2 C), high-rate capability (794 8 long cycle life (extremely low attenuation rate 0.0144% each 5 C over 2000 cycles). Encouragingly, 1.6 g S/Ah-level pouch cell realizes density up to 359 Wh kg-1 under lean E/S usage 3.0 μL mg-1. This work sheds light on design roadmap tackling S-cathode Li-anode challenges simultaneously toward long-durability

Language: Английский

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A review on lithium-sulfur batteries: Challenge, development, and perspective

Nano Research, Journal Year: 2023, Volume and Issue: 16(6), P. 8097 - 8138

Published: Jan. 5, 2023

Language: Английский

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A redox-active perylene-anthraquinone donor-acceptor conjugated microporous polymer with an unusual electron delocalization channel for photocatalytic reduction of uranium (VI) in strongly acidic solution

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 314, P. 121467 - 121467

Published: May 3, 2022

Language: Английский

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Monodispersed FeS₂ Electrocatalyst Anchored to Nitrogen‐Doped Carbon Host for Lithium–Sulfur Batteries

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(43)

Published: Aug. 15, 2022

Abstract Despite their high theoretical energy density, lithium–sulfur (Li–S) batteries are hindered by practical challenges including sluggish conversion kinetics and shuttle effect of polysulfides. Here, a nitrogen‐doped continuous porous carbon (CPC) host anchoring monodispersed sub‐10 nm FeS 2 nanoclusters (CPC@FeS ) is reported as an efficient catalytic matrix for sulfur cathode. This shows strong adsorption polysulfides, promising the inhibition polysulfide promoted initial stage process. Moreover, fast lithium ion (Li‐ion) diffusion accelerated solid–solid Li S to on CPC@FeS guarantee boosted electrochemical process species in Li–S cell, which gives utilization under conditions loading low electrolyte/sulfur (E/S) ratio. Therefore, surfur cathode (S/CPC@FeS delivers specific capacity 1459 mAh g −1 at 0.1 C, stable cycling over 900 cycles with ultralow fading rate 0.043% per cycle, enhanced capability compared only using host. Further demonstration this pouch cell density 372 Wh kg 7.1 mg cm −2 E/S ratio 4 µL .

Language: Английский

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A Dual−Functional Cationic Covalent Organic Frameworks Modified Separator for High Energy Lithium Metal Batteries

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(13)

Published: Jan. 15, 2023

Abstract Separator modification is an efficient strategy to handle with the challenges of lithium metal batteries but its success primarily subject materials. Herein, a cationic covalent organic framework (COF) composed positively charged units and weakly bonded fluoride ions (F − ) introduced modify commercial polypropylene separator (COF−F@PP). It found that unit has abundant nanopores homogenize (Li + flux can interact electrolyte solvent molecules form desolvation structure Li . Meanwhile, F within proved assist in building robust LiF−riched solid interphase avoid side reactions between anode electrolyte. Hence, COF−F@PP delivers feasible practicality for outstanding cycling stability, high Coulombic efficiency, superior rate capability Li//LFP coin cell at 5 C, low N/P ratio (2.19) full cell, pouch 1 C.

Language: Английский

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Toward Dendrite-Free Metallic Lithium Anodes: From Structural Design to Optimal Electrochemical Diffusion Kinetics

ACS Nano, Journal Year: 2022, Volume and Issue: 16(11), P. 17729 - 17760

Published: Oct. 28, 2022

Lithium metal anodes are ideal for realizing high-energy-density batteries owing to their advantages, namely high capacity and low reduction potentials. However, the utilization of lithium is restricted by detrimental dendrite formation, repeated formation fracturing solid electrolyte interphase (SEI), large volume expansion, resulting in severe "dead lithium" subsequent short circuiting. Currently, researches principally focused on inhibition toward extending maintaining battery lifespans. Herein, we summarize strategies employed interfacial engineering current-collector host designs as well emerging electrochemical catalytic methods evolving-accelerating-ameliorating ion/atom diffusion processes. First, based fabrication robust SEIs reviewed from aspects compositional constituents including inorganic, organic, hybrid SEI layers derived additives or artificial pretreatments. Second, summary discussion presented metallic carbon-based three-dimensional current collectors serving hosts, functionality decreasing local deposition density effect introducing lithiophilic sites. Third, assess recent advances exploring alloy compounds atomic catalysts accelerate lateral kinetics average spatial distribution smooth plating. Finally, opportunities challenges presented, providing insights into modulation achieving dendrite-free batteries.

Language: Английский

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Engineering Strategies for Suppressing the Shuttle Effect in Lithium–Sulfur Batteries

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 16(1)

Published: Nov. 10, 2023

Lithium-sulfur (Li-S) batteries are supposed to be one of the most potential next-generation owing their high theoretical capacity and low cost. Nevertheless, shuttle effect firm multi-step two-electron reaction between sulfur lithium in liquid electrolyte makes much smaller than value. Many methods were proposed for inhibiting polysulfide, improving corresponding redox kinetics enhancing integral performance Li-S batteries. Here, we will comprehensively systematically summarize strategies from all components First, electrochemical principles/mechanism origin described detail. Moreover, efficient strategies, including boosting conversion rate sulfur, confining or polysulfides (LPS) within cathode host, LPS shield layer, preventing contacting anode, discussed suppress effect. Then, recent advances inhibition cathode, electrolyte, separator, anode with aforementioned have been summarized direct further design materials Finally, present prospects development directions

Language: Английский

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Covalent Organic Framework with 3D Ordered Channel and Multi-Functional Groups Endows Zn Anode with Superior Stability

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 16(1)

Published: Jan. 4, 2024

Abstract Achieving a highly robust zinc (Zn) metal anode is extremely important for improving the performance of aqueous Zn-ion batteries (AZIBs) advancing “carbon neutrality” society, which hampered by uncontrollable growth Zn dendrite and severe side reactions including hydrogen evolution reaction, corrosion, passivation, etc. Herein, an interlayer containing fluorinated zincophilic covalent organic framework with sulfonic acid groups (COF-S-F) developed on (Zn@COF-S-F) as artificial solid electrolyte interface (SEI). Sulfonic group (− SO 3 H) in COF-S-F can effectively ameliorate desolvation process hydrated ions, three-dimensional channel fluoride (-F) provide interconnected channels favorable transport ions ion-confinement effects, endowing Zn@COF-S-F dendrite-free morphology suppressed reactions. Consequently, symmetric cell stably cycle 1,000 h low average hysteresis voltage (50.5 mV) at current density 1.5 mA cm −2 . Zn@COF-S-F|MnO 2 delivers discharge specific capacity 206.8 mAh g −1 1.2 A after 800 cycles high-capacity retention (87.9%). Enlightening, building SEI metallic surface targeted design has been proved effective strategy to foster practical application high-performance AZIBs.

Language: Английский

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A Janus MXene/MOF separator for the all-in-one enhancement of lithium-sulfur batteries

Energy storage materials, Journal Year: 2022, Volume and Issue: 55, P. 652 - 659

Published: Dec. 20, 2022

Language: Английский

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Engineering Cooperative Catalysis in Li–S Batteries

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(26)

Published: June 6, 2023

Abstract Lithium–sulfur (Li–S) batteries are regarded to be one of the most promising next‐generation owing merits high theoretical capacity and low cost. However, aprotic S electrochemistry is hampered by shuttling effect sluggish conversion soluble lithium polysulfides (LiPSs). Various electrocatalysts have been designed optimize kinetics LiPSs. Heteroatom doping or polar catalyst incorporation plays an important role remedy these shortcomings. Here, cooperative catalytic effects engendered heteroatom codoping engineering, catalyst/heteroatom composite strategy, integrating polar‐metal‐based material design summarized. First, principles on conductive interface described in detail. Moreover, a systematic investigation electrocatalytic characterization techniques that establish bridge between solid–liquid macroscopic electrochemical performance highlighted, providing more scientific guidance for design. In conclusion, stemming from current achievements, future directions targeting high‐energy‐density Li–S commercialization proposed.

Language: Английский

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