Breakthrough in Energy Storage: Researchers Develop Tandem Catalyst for Lithium-Sulfur Batteries

Researchers from the Beijing Institute of Technology have made a significant discovery in the field of energy storage, developing a tandem catalysis mechanism to improve the efficiency of lithium-sulfur batteries. Their innovative approach involves using a single-atom catalyst with dual active sites, which accelerates the conversion of lithium polysulfides, a crucial step in the battery's operation. The team's research demonstrates that their design can achieve high capacity retention and excellent performance in various testing scenarios, including high sulfur loading and cycling.

Key Takeaways:

• The researchers developed an asymmetric Ta-N5 single-atom catalyst (Ta SAs/NC) with dual active sites, which triggers tandem catalysis and promotes the conversion of lithium polysulfides.
• The Ta-S bond in the catalyst predominantly accelerates the liquid-solid conversion of LiPSs, while the N5-Li bond serves as the principal active site for the subsequent solid-solid conversion.
• The lithium-sulfur batteries with the Ta SAs/NC interlayer exhibit a high capacity retention of 90.42% after 500 cycles at 7 C.
• The cells with a high sulfur loading of 5.03 mg cm−2 deliver an exceptional initial areal capacity of 5.72 mAh cm−2 and maintain 5.01 mAh cm−2 after 30 cycles.
• The pouch cell based on this interlayer exhibits excellent capacity decay of 0.21% per cycle after 200 cycles.
• The researchers used financial support from the National Natural Science Foundation of China (NSFC) to conduct this research.
• The team included Zhenhua Wang, Tan Wang, Zhe Bai, Xiaotian Gao, Kening Sun, Yu Bai, Yaojie Lei, and Guoxiu Wang as authors, with Zhenhua Wang being the speaker from the Beijing Institute of Technology.
• The publication "A Tandem Catalysis To Accelerate Solid-state Sulfur Conversion In Lithium-sulfur Batteries" was released in Energy Storage Materials (Volume 81, 2025).

Statistics:

• 90.42% capacity retention after 500 cycles at 7 C
• 5.72 mAh cm−2 initial areal capacity with a sulfur loading of 5.03 mg cm−2
• 5.01 mAh cm−2 areal capacity maintained after 30 cycles
• 0.21% capacity decay per cycle after 200 cycles
• 5.03 mg cm−2 sulfur loading

Sources:

• A Tandem Catalysis To Accelerate Solid-state Sulfur Conversion In Lithium-sulfur Batteries. Energy Storage Materials, 2025;81.
• NewsRx. Findings from Beijing Institute of Technology Reveals New Findings on Energy Storage (A Tandem Catalysis To Accelerate Solid-state Sulfur Conversion In Lithium-sulfur Batteries). Energy Weekly News. September 26, 2025; p 76.