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

Advanced Materials, Год журнала: 2023, Номер 35(26)

Опубликована: Март 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.

Язык: Английский

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Inorganic Filler Enhanced Formation of Stable Inorganic‐Rich Solid Electrolyte Interphase for High Performance Lithium Metal Batteries

Advanced Functional Materials, Год журнала: 2023, Номер 33(29)

Опубликована: Апрель 2, 2023

Abstract Lithium metal (LM) is a promising anode material for next generation lithium ion based electrochemical energy storage devices. Critical issues of unstable solid electrolyte interphases (SEIs) and dendrite growth however still impede its practical applications. Herein, composite gel polymer (GPE), formed through in situ polymerization pentaerythritol tetraacrylate with fumed silica fillers, developed to achieve high performance batteries (LMBs). As evidenced theoretically experimentally, the presence SiO 2 not only accelerates Li + transport but also regulates solvation sheath structures, thus facilitating fast kinetics formation stable LiF‐rich interphase achieving uniform depositions suppress growth. The GPE‐based Li||Cu half‐cells Li||Li symmetrical cells display Coulombic efficiency (CE) 90.3% after 450 cycles maintain stability over 960 h at 3 mA cm −2 mAh , respectively. In addition, Li||LiFePO 4 full‐cells LM limited supply capacity retention 68.5% 700 0.5 C (1 = 170 g −1 ). Especially, when further applied anode‐free LMBs, carbon cloth||LiFePO full‐cell exhibits excellent cycling an average CE 99.94% 160th cycle C.

Язык: Английский

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Morphology evolution of CoNi‐LDHs synergistically engineered by precipitant and variable cobalt for asymmetric supercapacitor with superior cycling stability

EcoEnergy, Год журнала: 2023, Номер 1(2), С. 448 - 459

Опубликована: Дек. 1, 2023

Abstract Cobalt–nickel layered double hydroxides (CoNi‐LDHs) have been extensively synthesized through precipitation methods for their application in supercapacitors (SC). However, the influence of precipitant quantity on both morphology evolution and SC performance has an underexplored area. This study systematically examines morphological changes CoNi‐LDHs by varying alkaline evaluates asymmetric SC. The findings reveal a progressive transformation with increase content, starting from nanorod (Co 1 Ni 2 (OH) ‐1HMA), progressing to nanorod/nansosheet composite ‐4HMA), ultimately evolving into nanosheet ‐8HMA). is attributed synergetic effect variable cobalt, which provides multiple valences induces evolution. resulting LDHs demonstrate different performances: (1) Co ‐1HMA exhibits maximum capacitance 1764 F/g, while ‐4HMA ‐8HMA show values 1460 F/g 1676 respectively; (2) rate capabilities showcase percentages 60.5% ‐1HMA, 83.1% ‐4HMA, 66.3% ‐8HMA; (3) energy densities are recorded at 72.1 Wh/kg 41.3 62.8 Co1Ni ‐8HMA. Particularly, superlong cycling stability, retaining approximately 99% after 25000 consecutive charge/discharge cycles 7.0 A/g. result underscores its significant potential efficient storage applications.

Язык: Английский

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Construction of Co₃O₄/ZnO Heterojunctions in Hollow N‐Doped Carbon Nanocages as Microreactors for Lithium–Sulfur Full Batteries

Advanced Science, Год журнала: 2023, Номер 10(19)

Опубликована: Апрель 20, 2023

Lithium-sulfur (Li-S) batteries are promising alternatives of conventional Li-ion attributed to their remarkable energy densities and high sustainability. However, the practical applications Li-S hindered by shuttling effect lithium polysulfides (LiPSs) on cathode Li dendrite formation anode, which together leads inferior rate capability cycling stability. Here, an advanced N-doped carbon microreactors embedded with abundant Co

Язык: Английский

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High-throughput and high-performance lithium-ion batteries via dry processing

Chemical Engineering Journal, Год журнала: 2023, Номер 471, С. 144300 - 144300

Опубликована: Июль 3, 2023

Язык: Английский

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MOF‐Derived Materials Enabled Lithiophilic 3D Hosts for Lithium Metal Anode — A Review

Chinese Journal of Chemistry, Год журнала: 2023, Номер 41(15), С. 1861 - 1874

Опубликована: Фев. 9, 2023

Comprehensive Summary This work systematically reviews recent progresses in the applications of MOF‐derived materials modified 3D porous conductive framework as hosts for uniform lithium deposition LMBs. A series commonly used lithiophilic and several kinds representative MOF‐derivation‐modified metal anode (LMA) are presented. Finally, challenges future development employing to modify LMA included.

Язык: Английский

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A composite gel polymer electrolyte by incorporating modified POSS endowing inorganic-rich SEI formation and stable cycle life for lithium metal batteries

Chemical Engineering Journal, Год журнала: 2024, Номер 484, С. 149499 - 149499

Опубликована: Фев. 10, 2024

Язык: Английский

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Lithiophilic CoF2@C hollow spheres towards spatial lithium deposition for stable lithium metal batteries

Journal of Energy Chemistry, Год журнала: 2024, Номер 97, С. 55 - 67

Опубликована: Июнь 5, 2024

Язык: Английский

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Insight into the Fast‐Rechargeability of a Novel Mo_1.5W_1.5Nb₁₄O₄₄Anode Material for High‐Performance Lithium‐Ion Batteries

Advanced Energy Materials, Год журнала: 2022, Номер 12(36)

Опубликована: Июль 22, 2022

Abstract Wadsley–Roth phased niobates are promising anode materials for lithium‐ion batteries, while their inherently low electrical conductivity still limits rate‐capability. Herein, a novel doped Mo 1.5 W Nb 14 O 44 (MWNO) material is facilely prepared via an ionothermal‐synthesis‐assisted doping strategy. The detailed crystal structure of MWNO characterized by neutron powder diffraction and aberration corrected scanning transmission electron microscope, unveiling the full occupation 6+ ‐dopant at t 1 tetrahedral site. In half‐cells, exhibits enhanced fast‐rechargeability. origin improved performance investigated ultraviolet–visible diffuse reflectance spectroscopy, density functional theory (DFT) computation, electrochemical impedance revealing that bandgap narrowing improves MWNO. Furthermore, operando X‐ray elucidates typical solid‐solution phase conversion‐based insertion/extraction mechanism with reversible structural evolution during reaction. boosted diffusivity MWNO, due to /W effect, confirmed galvanostatic intermittent titration technique DFT. With simultaneously diffusivity, successfully demonstrates its fast‐rechargeability practicality in LiNi 0.5 Mn 4 ‐coupled full‐cells. Therefore, this work illustrates potential ionothermal synthesis energy storage provides mechanistic understanding effect on improving material's performance.

Язык: Английский

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In-situ synthesis of porous metal fluoride@carbon composite via simultaneous etching/fluorination enabled superior Li storage performance

Nano Energy, Год журнала: 2022, Номер 103, С. 107862 - 107862

Опубликована: Сен. 30, 2022

Язык: Английский

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