Kim Soochan, Yang Kyeongmin, Yang Kaiwei, De Volder Michael, Lee Youngkwan
Department of Engineering, University of Cambridge, Cambridge, CB3 0FS United Kingdom.
School of Chemical Engineering, Sungkyunkwan University, 16419 Suwon, Republic of Korea.
Nano Lett. 2023 Nov 22;23(22):10391-10397. doi: 10.1021/acs.nanolett.3c03021. Epub 2023 Nov 9.
Lithium-sulfur batteries (LiSBs) are promising next-generation batteries because of their low cost and high theoretical energy densities. Despite remarkable advances over the decades, polysulfide (PS) shuttling during battery cycling remains a challenge in the development of commercial LiSBs and is accelerated under practical conditions. Herein, we report a permselective ionic shield between the electrodes that blocks PS shuttles and passes Li ions to high-performance LiSBs. This shield is easily built onto the separator by ionic complexation and intermolecular bonding of functional polymers, thereby improving the battery performance and safety. The LiSB with the developed shield delivers a remarkable discharge capacity of 917 mAh g after 1000 cycles at 2 C. In addition, the behavior of LiSBs under practical conditions that can realize a high energy density is investigated to achieve the optimal balance in this system. This study provides new insights into the imminent development of separators for practical LiSBs.
锂硫电池（LiSBs）因其低成本和高理论能量密度而成为很有前景的下一代电池。尽管几十年来取得了显著进展，但电池循环过程中的多硫化物（PS）穿梭现象仍是商用锂硫电池发展中的一个挑战，并且在实际条件下会加速。在此，我们报告了一种电极之间的选择性离子屏蔽层，它能阻止PS穿梭并使锂离子通过，从而实现高性能的锂硫电池。这种屏蔽层通过功能聚合物的离子络合和分子间键合很容易地构建在隔膜上，从而提高了电池性能和安全性。具有这种开发的屏蔽层的锂硫电池在2 C下经过1000次循环后，放电容量达到了917 mAh g。此外，还研究了锂硫电池在能够实现高能量密度的实际条件下的行为，以在该系统中实现最佳平衡。这项研究为实际锂硫电池隔膜的迫切发展提供了新的见解。
