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A Promising Approach to Ultra-Flexible 1 Ah Lithium-Sulfur Batteries Using Oxygen-Functionalized Single-Walled Carbon
Junyoung Heo1,2, Jeong-Won Hong1, Ha Won Gu1
1Next-Generation Battery Research Center, Korea Electrotechnology Research Institute (KERI), 12, Jeongiui-gil, Seongsan-gu, Changwon-si, Gyeongsangnam-do, 51543, Republic of Korea.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 4, 2024
Summary
Highly oxidized single-walled carbon nanotubes (Ox-SWCNTs) enable ultra-flexible lithium-sulfur batteries with enhanced energy density. This advancement offers a viable path for commercializing lightweight, high-performance energy storage solutions.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-sulfur (Li-S) batteries offer high theoretical energy density.
- Achieving high energy density and stability in Li-S batteries remains a challenge.
Purpose of the Study:
- To develop large-area, ultra-flexible Li-S batteries with enhanced energy density.
- To utilize highly oxidized single-walled carbon nanotubes (Ox-SWCNTs) as a functional material.
Main Methods:
- Incorporation of Ox-SWCNTs into sulfur cathodes and separators.
- Fabrication of free-standing sulfur cathodes and flexible pouch cells.
- Electrochemical characterization of Li-S cells.
Main Results:
- Free-standing sulfur cathodes maintained 806 mAh g-1 after 100 cycles.
- Ox-SWCNTs promoted lithium polysulfide adsorption, enhancing performance.
- Flexible Li-S pouch cells achieved 1.06 Ah capacity and 909 mAh g-1 energy density over 50 cycles.
Conclusions:
- Ox-SWCNT-based architecture significantly enhances Li-S battery performance and mechanical flexibility.
- This approach provides a viable, lightweight, and ultra-flexible energy storage solution.
- The strategy is suitable for commercializing rechargeable Li-S batteries.
