High-Entropy MXene as Bifunctional Mediator toward Advanced Li–S Full Batteries

ACS Nano, Год журнала: 2024, Номер 18(3), С. 2395 - 2408

Опубликована: Янв. 9, 2024

The development of high-energy-density Li–S batteries (LSBs) is still hindered by the disturbing polysulfide shuttle effect. Herein, with clever combination between "high entropy" and MXene, an HE-MXene doped graphene composite containing multiple element quasi-atoms as bifunctional mediator for separator modification (HE-MXene/G@PP) in LSBs proposed. HE-MXene/G@PP offers high electrical conductivity fast lithium (LiPS) redox conversion kinetics, abundant metal active sites efficient chemisorption LiPSs, strong lipophilic characteristics uniform Li+ deposition on surface. As demonstrated DFT theoretical calculations, situ Raman, DRT results successively, efficiently captures LiPSs through synergistic modulation cocktail effect accelerates reaction, lattice distortion effectively induces homogeneous dendritic-free lithium. Therefore, this work achieves excellent long-term cycling performance a decay rate 0.026%/0.031% per cycle after 1200 cycles at 1 C/2 C. Li||Li symmetric cell maintains stable overpotential 6000 h under 40 mA cm–2/40 mAh cm–2. Furthermore, it delivers favorable stability 7.8 mg cm–2 low E/S ratio 5.6 μL mg–1. This strategy provides rational approach to resolve sulfur cathode anode problems simultaneously.

Язык: Английский

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Accelerated Li⁺ Desolvation for Diffusion Booster Enabling Low‐Temperature Sulfur Redox Kinetics via Electrocatalytic Carbon‐Grazfted‐CoP Porous Nanosheets

Advanced Functional Materials, Год журнала: 2023, Номер 33(36)

Опубликована: Май 19, 2023

Abstract Lithium–sulfur (Li–S) batteries are famous for their high energy density and low cost, but prevented by sluggish redox kinetics of sulfur species due to depressive Li ion diffusion kinetics, especially under low‐temperature environment. Herein, a combined strategy electrocatalysis pore sieving effect is put forward dissociate the + solvation structure stimulate free diffusion, further improving reaction kinetics. As protocol, an electrocatalytic porous diffusion‐boosted nitrogen‐doped carbon‐grafted‐CoP nanosheet designed via forming NCoP active release more react with species, as fully investigated electrochemical tests, theoretical simulations in situ/ex situ characterizations. result, cells booster achieve desirable lifespan 800 cycles at 2 C excellent rate capability (775 mAh g −1 3 C). Impressively, condition mass loading or environment, cell 5.7 mg cm −2 stabilizes areal capacity 3.2 charming 647 obtained 0 °C after 80 cycles, demonstrating promising route providing ions toward practical high‐energy Li–S batteries.

Язык: Английский

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Toward Low‐Temperature Zinc‐Ion Batteries: Strategy, Progress, and Prospect in Vanadium‐Based Cathodes

Advanced Energy Materials, Год журнала: 2023, Номер 14(8)

Опубликована: Дек. 28, 2023

Abstract Low‐temperature vanadium‐based zinc ion batteries (LT‐VZIBs) have attracted much attention in recent years due to their excellent theoretical specific capacities, low cost, and electrochemical structural stability. However, working temperature surrounding often results retarded transport not only the frozen aqueous electrolyte, but also at/across cathode/electrolyte interface inside cathode interior, significantly limiting performance of LT‐VZIBs for practical applications. In this review, a variety strategies solve these issues, mainly including interface/bulk structure engineering electrolyte optimizations, are categorially discussed systematically summarized from design principles in‐depth characterizations mechanisms. end, several issues about future research directions advancements characterization tools prospected, aiming facilitate scientific commercial development LT‐VZIBs.

Язык: Английский

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Heteroelectrocatalyst MoS2@CoS2 modified separator for Li-S battery: Unveiling superior polysulfides conversion and reaction kinetics

Chemical Engineering Journal, Год журнала: 2024, Номер unknown, С. 155915 - 155915

Опубликована: Сен. 1, 2024

Язык: Английский

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Three Birds with One Stone: Multifunctional TiN‐MXene‐Co@CNTs Network as Sulfur/Lithium Host for High‐Areal‐Capacity Lithium‐Sulfur Batteries

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(35)

Опубликована: Июнь 13, 2024

Abstract The inevitable shuttling and slow redox kinetics of lithium polysulfides (LiPSs) as well the uncontrolled growth Li dendrites have strongly limited practical applications lithium‐sulfur batteries (LSBs). To address these issues, we innovatively constructed carbon nanotubes (CNTs) encapsulated Co nanoparticles in situ grown on TiN‐MXene nanosheets, denoted TiN‐MXene‐Co@CNTs, which could serve simultaneously both sulfur/Li host to kill “three birds with one stone” (1) efficiently capture soluble LiPSs expedite their conversion, (2) accelerate nucleation/decomposition solid 2 S, (3) induce homogeneous deposition. Benefiting from synergistic effects, TiN‐MXene‐Co@CNTs/S cathode a sulfur loading 2.5 mg cm −2 show high reversible specific capacity 1129.1 mAh g −1 after 100 cycles at 0.1 C, ultralong cycle life over 1000 1.0 C. More importantly, it even achieves areal 6.3 50 under 8.9 low E/S ratio 5.0 μL . Besides, TiN‐MXene‐Co@CNTs deliver stable plating/striping behavior h.

Язык: Английский

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An interpenetrated protein-polar polymer interlayer for suppressing shuttle effect in Li-S batteries

Journal of Power Sources, Год журнала: 2025, Номер 630, С. 236145 - 236145

Опубликована: Янв. 2, 2025

Язык: Английский

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Eliminating bandgap between Cu-CeO2-x heterointerface enabling fast electron transfer and redox reaction in Li-S batteries

Energy storage materials, Год журнала: 2023, Номер 63, С. 102983 - 102983

Опубликована: Сен. 18, 2023

Язык: Английский

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Sulfur-doped hollow C@CoP nanosphere modified separator for enhancing polysulfides anchoring and conversion in Li–S batteries

Journal of Power Sources, Год журнала: 2023, Номер 580, С. 233382 - 233382

Опубликована: Июль 11, 2023

Язык: Английский

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Electron delocalization-enhanced sulfur reduction kinetics on an MXene-derived heterostructured electrocatalyst

Nano Research, Год журнала: 2024, Номер 17(8), С. 7153 - 7162

Опубликована: Май 15, 2024

Язык: Английский

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Polysulfide-mediated solvation shell reorganization for fast Li+ transfer probed by in-situ sum frequency generation spectroscopy

Energy storage materials, Год журнала: 2024, Номер 67, С. 103289 - 103289

Опубликована: Фев. 21, 2024

Understanding of interfacial Li + solvation shell structures and dynamic evolution at the electrode/electrolyte interface is requisite for developing high-energy-density batteries.Herein, reorganization sulfur/electrolyte along with presence a trace amount lithium polysulfides verified by in-situ sum frequency generation (SFG) spectroscopy together density functional theory (DFT) calculations.Both spectroelectrochemical DFT calculation results reveal strongly competitive anion adsorption polysulfide additive against pristine electrolyte on sulfur cathode surface, reorganizing local structure facilitating rapid ion transfer conduction.Meanwhile, SFG signals discharging/charging cycle exhibits improved reversibility, indicating transformation inner Helmholtz plane layer into stable molecular-layer interphase rather than diffusion layer.Consequently, applications in practical Li-S batteries capacity cycling stability corresponding cells are significantly enhanced.Our work provides methodology using probing charge carriers electrochemical interfaces.

Язык: Английский

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