High Spin‐State Modulation of Catalytic Centers by Weak Ligand Field for Promoting Sulfur Redox Reaction in Lithium‐Sulfur Batteries

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 8, 2024

The spin state of transition-metal compounds in lithium-sulfur batteries (LSBs) significantly impacts the electronic properties and kinetics sulfur redox reactions (SRR). However, accurately designing remains challenging, which is crucial for understanding structure-performance relationship developing high-performance electrocatalysts. Herein, CoF

Язык: Английский

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High Spin‐State Modulation of Catalytic Centers by Weak Ligand Field for Promoting Sulfur Redox Reaction in Lithium‐Sulfur Batteries

Angewandte Chemie, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 8, 2024

Abstract The spin state of transition‐metal compounds in lithium‐sulfur batteries (LSBs) significantly impacts the electronic properties and kinetics sulfur redox reactions (SRR). However, accurately designing remains challenging, which is crucial for understanding structure‐performance relationship developing high‐performance electrocatalysts. Herein, CoF 2 , specifically Co 2+ with 3 d 7 electrons a high‐spin distribution (t 2g 5 e g ), were tailored predictably first time through weak coordination field effect F element. Both DFT calculations experimental results confirm that transitions from low‐ to configurations strongly interacts species Co−S Li−F bonds during SRR process. This interaction weakens S−S bond, promoting its facile cleavage both ends while also facilitating rapid uniform nucleation Li S /Li S, thus resulting LSBs capacity 447.7 mAh −1 at 10 C rates stable cycling 1000 cycles, an acceptable practical 585 high loading mass mg cm −2 . work achieves rational control active electron enriches application accelerate LSBs.

Язык: Английский

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Moderately Solvating Electrolyte with Fluorinated Cosolvents for Lean‐Electrolyte Li–S Batteries

Advanced Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 30, 2024

Abstract To surpass the energy density limit of current Li–S batteries, attaining a long lifespan under lean‐electrolyte conditions is imperative. The persistent challenge involves suppressing electrolyte decomposition while facilitating sulfur electrode reaction. In this study, solvating power 1dimethoxy ethane fine‐tuned, main solvent, using fluorinated ether cosolvents via H–F interactions. As fluorination degree cosolvent increases, coordination anions around Li‐ion and solubilities Li polysulfides decrease. By systematically varying power, moderately electrolytes are prepared that can effectively suppress dissolution without hindering redox kinetics. induce uniform deposition reduce owing to formation anion‐derived solid interphase. An assembled pouch‐type battery containing an with optimized solvation delivers 405 Wh kg −1 at E/S ratio 2.0 µL mg s over 80 cycles. This study suggests strategy finely tune + structure for achieving well‐balanced performances cathodes Li‐metal anodes conditions.

Язык: Английский

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TiO2/CNTs dual-decorated functional carbon foam as self-supporting sulfur host for boosting the adsorption and redox kinetics of polysulfides

Journal of Alloys and Compounds, Год журнала: 2024, Номер unknown, С. 178225 - 178225

Опубликована: Дек. 1, 2024

Язык: Английский

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Synergistic effect of oxygen-deficient Ni3V2O8@carbon nanotubes-modified separator for advanced lithium–sulfur batteries

Rare Metals, Год журнала: 2024, Номер unknown

Опубликована: Дек. 28, 2024

Язык: Английский

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