Facile and scalable fabrication of high-energy-density sulfur cathodes for pragmatic lithium-sulfur batteries

Authors
Kim, Min-SeopKim, Mun SekDo, VandungXia, YongyaoKim, WoongCho, Won Il
Issue Date
2019-05-15
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v.422, pp.104 - 112
Abstract
Lithium-sulfur battery is garnering much of attention due to its high energy densities, low-cost active material of sulfur and variety of applications in portable electronics. High integrity and consistent qualities of the large-scale sulfur cathode with high energy have to be ensured to construct reliable and practical lithium-sulfur batteries that could supersede advancing lithium-ion batteries. Here, facile and productive approaches are developed to mass-produce functional sulfur hosts and to fabricate large-scale sulfur cathode with high sulfur loading. The functional sulfur host is synthesized by anchoring polyethylenimine at the surface of commercially available carbon at inert conditions with a scale of more than 10 g per batch via simple solution method. Combining the functionalized sulfur host with a polyacrylic acid binder allows high integrity and uniformity of the high sulfur loading cathode to be fabricated in large dimensions. Followed by this approach, the sulfur cathode, 70 x 6 cm(2), is produced with the sulfur loading of > 4.3 mg cm(-2). It is found that 12 wt% of polyethylenimine in the functionalized sulfur host with polyacrylic acid is at optimal condition that presents stable electrochemical performances over 600 cycles.
Keywords
RAMAN-SPECTROSCOPY; ION BATTERY; LONG-LIFE; ELECTRODE; GRAPHENE; COMPOSITES; DISCHARGE; CAPACITY; POLYMER; AREA; RAMAN-SPECTROSCOPY; ION BATTERY; LONG-LIFE; ELECTRODE; GRAPHENE; COMPOSITES; DISCHARGE; CAPACITY; POLYMER; AREA; Surface functionalization; Large-scale sulfur cathode; Polar binder; Lithium-sulfur batteries
ISSN
0378-7753
URI
https://pubs.kist.re.kr/handle/201004/119991
DOI
10.1016/j.jpowsour.2019.02.093
Appears in Collections:
KIST Article > 2019
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