Lithium-sulfur (Li-S) battery is attracting intense attention due to its extremely high theoretical specific capacity and low cost. However, the dissolution and diffusion of lithium polysulfides (LiPS), as well as the insulating property of sulfur and its discharge products, limit the practical application of Li-S battery. In this work, we developed an ultralight functional separator (LBL-fseparator) with orderly structure and multifunctional properties through electrostatic layer-by-layer (LBL) self-assembly of positively charged poly(diallyl dimethyl ammonium chloride) (PDDA) wrapped covalent triazine framework (CTF) (CTF@PDDA) and negatively charged poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PEDOT: PSS) to effectively retard LiPS shuttle and improve the utilization of active sulfur material. The CTF@PDDA as LiPS shuttle inhibiting layers displays strong LiPS-anchor ability through physical/chemical interaction as well as excellent electrolyte uptake capacity due to its large specific surface area and porous structure, while the PEDOT: PSS as the conductive layers improves electron transfer as well as excellent interface stabilizer and adhesion binder. It was demonstrated that the proposed LBL-fseparator assembled with general S-cathode and Li metal anode displays commendable cycling stability (0.052% capacity fade-rate per cycle over 1000 cycles at 1C), superb utilization of sulfur (90.7% at 0.1C and 59.2% at 2C), and enhanced protection ability of the Li metal. The excellent battery performance and easily mass-produced method provide a useful strategy for industrial-scale production.

锂硫（Li-S）电池由于其极高的理论比容量和低成本而备受关注。然而，多硫化锂（LiPS）的溶解和扩散以及硫及其放电产物的绝缘性能限制了锂硫电池的实际应用。在这项工作中，我们开发了超轻功能隔板（LBL- f通过带正电的聚（二烯丙基二甲基氯化铵）（PDDA）包裹的共价三嗪骨架（CTF）（CTF @ PDDA）和带负电的聚乙二烯的静电逐层（LBL）自组装而具有结构和多功能特性的有序结构（3,4-乙撑二氧噻吩）-聚（苯乙烯磺酸盐）（PEDOT：PSS）有效抑制LiPS穿梭并提高活性硫材料的利用率。CTF @ PDDA作为LiPS穿梭抑制层，由于其大的比表面积和多孔结构，通过物理/化学相互作用表现出强大的LiPS锚固能力以及出色的电解质吸收能力，而作为导电层的PEDOT：PSS改善了电子转移以及出色的界面稳定剂和粘合粘结剂。事实证明，拟议的LBL-f分离器与普通S阴极和Li金属阳极组装在一起，显示出可观的循环稳定性（在1C下1000次循环中，每循环0.052％的容量衰减率），硫的高利用率（0.1C下为90.7％，2C下为59.2％），以及增强了锂金属的保护能力。优异的电池性能和易于批量生产的方法为工业规模生产提供了有用的策略。