Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 319, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121934
Keywords
Li -S battery; Separator; 3D hollow N-Gr spheres; MoS 2 nanosheets; NiS 2-MnS nanoparticles
Funding
- National Research Foundation - Ministry of Science and ICT of Republic of Korea [2019R1A5A8080326]
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This work develops a multifunctional separator, as trapper-catalyst-conductor, for Li-S batteries. The separator demonstrates high-efficiency polysulfide trapping and efficient catalytic behavior. The super-structured substrate prevents agglomeration and facilitates electron transportation, while the mesoporous architecture facilitates Li ion diffusion.
This work develops a multifunctional separator, as trapper-catalyst-conductor, for Li-S batteries through modifying a Celgard separator by a novel hybrid comprising NiS2-MnS on a MoS2 nanosheets/3D hollow N-doped graphene microsphere framework. Benefiting from the great adsorption ability of MoS2 and NiS2-MnS for polysulfide species, the separator demonstrates high-efficiency polysulfide trapping. The ultrafine NiS2-MnS nanoparticles induce the developed separator to offer abundant catalytic active sites and efficient catalytic behavior for fast polysulfide redox. Furthermore, the super-structured N-doped 3D hollow graphene microsphere substrate can prevent both NiS2-MnS and MoS2 from agglomeration phenomenon during the synthesis/operation process, while providing a highway for electron transportation to catalytic active sites. Importantly, the excellent mesoporous architecture of the coating material facilitates the diffusion of Li ion. Therefore, the Li-S battery constructed by the proposed separator shows a much higher performance and superior cycling stability than that of the cell using pristine Celgard separator.
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