Lithium-Sulfur Batteries Get a Boost from Innovative Nanoporous Composite

Researchers from Hebei University of Technology in Tianjin, China, have developed a groundbreaking nanomaterial that significantly enhances the performance of lithium-sulfur (Li/S) batteries. By introducing a lightweight and porous TiO2-graphene oxide (GO) composite as an interlayer between the anode and cathode, the team has successfully suppressed the migration of intermediate polysulfides, thereby improving the battery's cyclic performance and rate capability.

Key Takeaways:

• The TiO2/GO composite interlayer effectively captures and stores polysulfides, leading to improved electrochemical performance.
• The hierarchically porous TiO2 nanoparticles wrapped in GO sheets facilitate the storage and chemical absorption of polysulfides, resulting in enhanced conductivity.
• The Li/S battery with the TiO/GO-coated separator exhibited an initial discharge capacity of 1102.8 mAh g, a 100th cycle capacity of 843.4 mAh g, and a capacity retention of 76.48% at a current rate of 0.2 C.
• The innovative composite interlayer holds promise for next-generation Li/S batteries.
• Researchers Lu Wang, Ning Liu, Taizhe Tan, Yan Zhao, and Yongguang Zhang contributed to this breakthrough study.

Statistics:

• Initial discharge capacity: 1102.8 mAh g
• 100th cycle capacity: 843.4 mAh g
• Capacity retention at 0.2 C: 76.48%
• Porous structure of TiO2 nanoparticles: hierarchically porous

Sources:

• [1] TiO2/GO-coated functional separator to suppress polysulfide migration in lithium-sulfur batteries. Beilstein Journal of Nanotechnology, 2019;10():1726-1736.
• [2] NewsRx. Researchers at Hebei University of Technology Discuss Findings in Nanoparticles (TiO2/GO-coated functional separator to suppress polysulfide migration in lithium-sulfur batteries). Nanotechnology Weekly. October 12, 2020; p 4806.