High-entropy oxide hollow spheres as efficient catalysts to accelerate sulfur conversion kinetics toward lithium–sulfur batteries

Chemical Communications, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Owing to the strong chemical adsorbing and catalytic effect of HEO on polysulfide transformation, HEO@S electrode exhibits excellent electrochemical performance.

Language: Английский

Solvent Dynamics in Gel Polymer Electrolytes for Lithium–Sulfur Batteries

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: May 16, 2025

Li-sulfur (Li-S) batteries are promising as the next-generation energy storage technology but face challenges due to sluggish sulfur redox reaction (SRR) kinetics and a shuttling effect. While many studies have explored polycaprolactone (PCL)-based gel polymer electrolytes (GPEs) address these issues, influence of solvent properties, including dielectric constant (ϵ) donor acceptor numbers (DN AN), remain unexplored despite their critical impact on performance full-scale implementation. This study systematically compares three distinct electrolytes, dimethoxyethane (DME), dimethyl sulfoxide (DMSO), tetraethylene glycol ether (TEGDME)-paired with PCL, correlate varied properties effects physical GPE, in terms Li+ transport solvation, polysulfide's confinement. Among them, DME-based an intermediate DN, exhibited lowest crystallinity (2.31%), highest ionic conductivity (7.49 mS/cm), high transference number (0.77). As result, it achieved specific capacity 795 mAh/g average Coulombic efficiency 97.5% after 120 cycles at C/5, outperforming its competitors. Operando Raman UV-vis spectroscopy confirmed that PCL effectively confines long-chain polysulfides within network, mitigating shuttle effect facilitating reversible polysulfide conversion. These findings demonstrate GPEs moderate DN values balanced ϵ significantly enhance stability, extend cycle life, improve rate for Li-S batteries. work provides valuable insights into design advanced electrolyte systems practical applications.

Language: Английский

Synergistic adsorption and catalysis enabled by hollow Co₉S₈–CoO heterostructures for high-performance lithium–sulfur batteries

Chemical Communications, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

The synergistic combination of adsorption and catalytic effects at the heterostructure interface empowers Co 9 S 8 –CoO@S composite to achieve superior electrochemical performance.

Language: Английский