The 6^th International Conference on Graphene and Novel Nanomaterials
(GNN 2024)

Abstract: The severe shuttle effect of polysulfides（LiPSs） is the main cause of capacity fading in lithium-sulfur (Li-S) batteries. Therefore, numerous researchers are currently investigating effective strategies to mitigate the shuttle effect of polysulfides. Our research focuses on employing physical and chemical approaches to enhance the performance of lithium-sulfur batteries. Given sulfur's insulating nature, it is imperative to establish a highly conductive network within the battery system. To address this issue, we have chosen pine-derived carbon materials with uniform and abundant pore sizes as interlayer materials for lithium-sulfur batteries. These materials not only provide a three-dimensional interconnected conductive network but also facilitate the growth of graphite whiskers inside the graphitized wood carbon pores, thereby offering additional reaction sites for sulfur cathodes and significantly enhancing battery performance. Building upon this foundation, we have incorporated Lewis acid-type perovskite materials with oxygen vacancies into the wood carbon pores to investigate their adsorption and catalytic mechanisms towards Lewis base-type polysulfides. The results demonstrate exceptional electrochemical performance without any degradation even after 500 cycles. However, due to its inherent brittleness, practical applications of wood carbon face challenges. Consequently, we have further developed porous carbon sieve/carbon sheet materials using cellulose as a raw material that can serve as both carriers for sulfur and membrane modification agents while still achieving outstanding electrochemical performance. Moreover, loading catalytic materials onto these carbon sheets enables more efficient conversion rates of polysulfides while maintaining a specific capacity of 493 mAhg-1 at a current density of 10C. Biomass resources are abundantly available and can be processed into porous materials suitable for various applications; furthermore, advancements in biomass-based carbon materials lay a solid foundation for lithium-sulfur battery applications.