Improving Rate Performance of Encapsulating Lithium-Polysulfide Electrolytes for Practical Lithium-Sulfur Batteries.
Angew Chem Int Ed Engl
; 63(10): e202318785, 2024 Mar 04.
Article
de En
| MEDLINE
| ID: mdl-38226740
ABSTRACT
The cycle life of high-energy-density lithium-sulfur (Li-S) batteries is severely plagued by the incessant parasitic reactions between Li metal anodes and reactive Li polysulfides (LiPSs). Encapsulating Li-polysulfide electrolyte (EPSE) emerges as an effective electrolyte design to mitigate the parasitic reactions kinetically. Nevertheless, the rate performance of Li-S batteries with EPSE is synchronously suppressed. Herein, the sacrifice in rate performance by EPSE is circumvented while mitigating parasitic reactions by employing hexyl methyl ether (HME) as a co-solvent. The specific capacity of Li-S batteries with HME-based EPSE is nearly not decreased at 0.1â
C compared with conventional ether electrolytes. With an ultrathin Li metal anode (50â
µm) and a high-areal-loading sulfur cathode (4.4â
mgS cm-2 ), a longer cycle life of 113â
cycles was achieved in HME-based EPSE compared with that of 65â
cycles in conventional ether electrolytes at 0.1â
C. Furthermore, both high energy density of 387â
Wh kg-1 and stable cycle life of 27â
cycles were achieved in a Li-S pouch cell (2.7â
Ah). This work inspires the feasibility of regulating the solvation structure of LiPSs in EPSE for Li-S batteries with balanced performance.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Langue:
En
Journal:
Angew Chem Int Ed Engl
Année:
2024
Type de document:
Article