Shao Junke, Li Yiyang, Guo Junling, Duan Jiaozi, Liang Huan, Dou Ying, Lu Siyu, Liu Jinping
Country State Center for International Cooperation on Designer Low-Carbon & Environmental Materials, School of Materials Science and Engineering, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, P. R. China.
Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, P. R. China.
Adv Mater. 2025 Jun;37(24):e2415864. doi: 10.1002/adma.202415864. Epub 2025 Apr 14.
Nonflammable and flexible solid polymer electrolytes (SPEs) are widely studied to improve the safety of lithium-sulfur batteries (LSBs). Studies on SPE-based LSBs primarily focus on addressing issues stemming from poor SPE properties, Li dendrites, and "shuttle effect" of polysulfides. Currently, strategies from SPE-based lithium batteries (without sulfur cathodes) and liquid electrolyte (LE)-based LSBs (without SPEs) are the most commonly employed approaches to tackle above issues. These strategies are designed without taking into account the problems caused by the coexistence of SPEs and sulfur cathodes, resulting in SPE-based LSBs exhibiting significantly inferior performance than liquid-electrolyte-based LSBs. Therefore, the strategies for SPE-based LSBs necessitate different designs. However, no reviews have focused on the aforementioned differences and analyzing their corresponding causes thus far, which is unfavorable for the development of this field. Herein, the emerging advances in SPE-based LSBs are comprehensively reviewed. In particular, for the first time, the different designs and their corresponding causes are comprehensively discussed. These causes include the high adsorption strength of SPEs with polysulfides, corrosion of polysulfides to barrier layers, deterioration of the ionic conductivity of SPEs, and defective interfaces between cathodes and SPEs. Finally, several pressing challenges and future prospects for the field are discussed.
为提高锂硫电池（LSB）的安全性，人们对不可燃且柔性的固体聚合物电解质（SPE）展开了广泛研究。基于SPE的LSB研究主要集中于解决因SPE性能不佳、锂枝晶以及多硫化物的“穿梭效应”所引发的问题。当前，基于SPE的锂电池（无硫阴极）和基于液体电解质（LE）的LSB（无SPE）所采用的策略是解决上述问题最常用的方法。这些策略在设计时未考虑SPE与硫阴极共存所导致的问题，致使基于SPE的LSB性能显著低于基于液体电解质的LSB。因此，基于SPE的LSB策略需要不同的设计。然而，迄今为止尚无综述聚焦于上述差异并分析其相应原因，这不利于该领域的发展。在此，对基于SPE的LSB的新兴进展进行了全面综述。特别地，首次全面讨论了不同的设计及其相应原因。这些原因包括SPE对多硫化物的高吸附强度、多硫化物对阻挡层的腐蚀、SPE离子电导率的恶化以及阴极与SPE之间的缺陷界面。最后，讨论了该领域的若干紧迫挑战和未来前景。
