Suppressing Self-Discharge with Polymeric Sulfur in Li-S Batteries
Min Jiang,
Bingqing Gan,
Yongqi Deng,
Yin Xiong,
Ruixuan Tan
Affiliations
Min Jiang
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Bingqing Gan
College of Materials Science and Engineering, Changsha University of Science & Technology, Changsha 410114, China
Yongqi Deng
College of Materials Science and Engineering, Changsha University of Science & Technology, Changsha 410114, China
Yin Xiong
College of Materials Science and Engineering, Changsha University of Science & Technology, Changsha 410114, China
Ruixuan Tan
Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
Lithium–sulfur (Li-S) batteries, due to their high theoretical capacity, intrinsic overcharge protection, and low cost, are considered as the most promising candidates for next-generation energy storage systems. To promote widespread use of Li-S batteries, various tactics have been reported to improve the columbic efficiency and to suppress the shuttle effect. Herein, we report a novel polymeric sulfur via heat radical polymerization, for the Li-S battery. The insolubles after CS2 washing, and the changes in XRD (X-ray diffraction) results imply the formation of polymeric sulfur. Owing to the absence of cyclic S8 molecular, the shuttle effect is depressed, and the polymeric sulfur cathodes exhibit lower self-discharge rates, higher sulfur utilization, better rates of performance, and enhanced cycling stabilities than the commercial sublimed sulfur. Thus, polymeric sulfur provides a new train of thought and tactics for restricting the formation of the dissolution of polysulfides, and self-discharge.
