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 × 6 cm2, 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.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation (NRF) of Korea (NRF-2016M1B3A1A01937324) and the Korea Institute of Science and Technology Institutional Program (Project No. 2E29650).
This work was supported by the National Research Foundation (NRF) of Korea (NRF- 2016M1B3A1A01937324 ) and the Korea Institute of Science and Technology Institutional Program (Project No. 2E29650 ).
© 2019 Elsevier B.V.
- Large-scale sulfur cathode
- Lithium-sulfur batteries
- Polar binder
- Surface functionalization
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering