Realizing High Utilization of High-Mass-Loading Sulfur Cathode via Electrode Nanopore Regulation.
Nano Lett
; 22(14): 5982-5989, 2022 07 27.
Article
em En
| MEDLINE
| ID: mdl-35816451
ABSTRACT
One main challenge of realizing high-energy-density lithium-sulfur batteries is low active materials utilization, excessive use of inert components, high electrolyte intake, and mechanical instability of high-mass-loading sulfur cathodes. Herein, chunky sulfur/graphene particle electrodes were designed, where active sulfur was confined in vertically aligned nanochannels (width â¼12 nm) of chunky graphene-based particles (â¼70 µm) with N, O-containing groups. The short charge transport distance and low tortuosity enabled high utilization of active materials for high-mass-loading chunky sulfur/graphene particle electrodes. The intermediate polysulfide trapping effect by capillary effect and heteroatoms-containing groups, and a mechanically robust graphene framework, helped to realize stable electrode cycling. The as-designed electrode showed high areal capacity (10.9 mAh cm-2) and high sulfur utilization (72.4%) under the rigorous conditions of low electrolyte/active material ratio (â¼2.5 µL mg-1) and high sulfur loading (9.0 mg cm-2), realizing high energy densities (520 Wh kg-1, 1635 Wh L-1).
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Nanoporos
/
Grafite
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article