Sulfur in Amorphous Silica for an Advanced Room-Temperature Sodium-Sulfur Battery.
Angew Chem Int Ed Engl
; 60(18): 10129-10136, 2021 Apr 26.
Article
em En
| MEDLINE
| ID: mdl-33554433
ABSTRACT
The room-temperature (RT) Na/S battery is a promising energy storage system owing to suitable operating temperature, high theoretical energy density, and low cost. However, it has a poor cycle life and low reversible capacity. In this work, we report a long-life RT-Na/S battery with amorphous porous silica as a sulfur host. The sulfur is loaded into amorphous silica by a dipping method; the optimal sulfur loading is up to 73.48â
wt %. Molecular dynamics simulation and first-principles calculations suggest that the complex pores, acting as micro-containers and the formation of Na-O chemical bonds between amorphous silica and sodium polysulfide, give the electrodes a strong ability to inhibit sodium polysulfide shuttle. This would give rise to effectively avoiding the loss of active sulfur, corresponding to a superior capacity and an excellent cyclability even at 10â
A gsulfur -1 (nearly 100 % coulomb efficiency and high reversible capacity of 955.8â
mAh gsulfur -1 after 1460â
cycles).
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article