Breakthrough in Lithium-Sulfur Battery Technology

Research has led to a significant advancement in lithium-sulfur battery technology, with the introduction of a novel separator material that enhances the battery's cycle stability, rate performance, and anti-self-discharge capability. This innovative approach involves coating ultrasmall Fe3O4 nanoparticles on carboxylated carbon nanotubes, creating a synergistic effect that prevents polysulfide shuttling and promotes the kinetic conversion reaction of sulfur species. The resulting lithium-sulfur batteries exhibit exceptional stability and performance, paving the way for their practical application in high-density energy storage.

Key Takeaways:

• The lithium-sulfur battery's "shuttle effect" is a significant obstacle to its practical application, which has been addressed by introducing a synergistic inhibitory effect on polysulfides shuttling.
• The proposed combination strategy involves coating ultrasmall Fe3O4 nanoparticles on carboxylated carbon nanotubes, creating a physical barrier and ion shielding layer that prevents polysulfide migration.
• The synergistic effect of the ultralight separator coating enables lithium-sulfur batteries to show outstanding cycle stability, excellent rate performance, and superior anti-self-discharge capability.
• The capacity decay of the lithium-sulfur batteries is as low as 0.032% per cycle at 1 C over 2000 cycles.
• The proposed combination strategy paves the way to the simple and scalable preparation of advanced separators.
• Jian Xu from the Chinese Academy of Sciences led the research, which included Dongdong Li, Ning Zhao, Xun Xu, Xinwei Wang, Junfeng Yang, and Jitao Chen as co-authors.
• The research was funded by the Key Research Program of Frontier Sciences of CAS, National Natural Science Foundation of China, and Shanghai Research Institute of Chemical Industry Co., Ltd.

Statistics:

• Areal weight of the ultralight separator coating: 1.79 g/m²
• Number of cycles: 2000
• Capacity decay per cycle: 0.032%
• Current: 1 C
• Rate performance: Excellent
• Anti-self-discharge capability: Superior

Sources:

• Synergistic Inhibitory Effect of Ultralight CNTs-COOH@Fe3O4 Modified Separator On Polysulfides Shuttling for High-performance Lithium-sulfur Batteries. Journal of Membrane Science, 2020;611():.
• Elsevier - www.elsevier.com
• Journal of Membrane Science - www.journals.elsevier.com/journal-of-membrane-science/