Lithium–sulfur batteries (LSBs) are considered promising candidates for the next‐generation energy‐storage systems due to their high theoretical capacity and prevalent abundance of sulfur. Their reversible operation, however, encounters challenges from both the anode, where dendritic and dead Li‐metal form, and the cathode, where polysulfides dissolve and become parasitic shuttles. Both issues arise from the imperfection of interphases between electrolyte and electrode. Herein, a new lithium salt based on an imide anion with fluorination and unsaturation in its structure is reported, whose interphasial chemistries resolve these issues simultaneously. Lithium 1, 1, 2, 2, 3, 3‐hexafluoropropane‐1, 3‐disulfonimide (LiHFDF) forms highly fluorinated interphases at both anode and cathode surfaces, which effectively suppress formation of Li‐dendrites and dissolution/shuttling of polysulfides, and significantly improves the electrochemical reversibility of LSBs. In a broader context, this new Li salt offers a new perspective for diversified beyond Li‐ion chemistries that rely on a Li‐metal anode and active cathode materials.

中文翻译：

---

新的锂盐形成抑制锂枝晶和多硫化物穿梭的相间相

锂硫电池（LSB）由于具有较高的理论容量和普遍的硫含量，因此被认为是下一代储能系统的有希望的候选者。然而，它们的可逆运行面临着阳极的挑战，在阳极中，树状和死的锂金属形成，而阴极上，多硫化物溶解并成为寄生的穿梭。这两个问题都源于电解质和电极之间的相间缺陷。在本文中，报道了一种基于酰亚胺阴离子的新型锂盐，该酰亚胺阴离子的结构具有氟化和不饱和键，其相间化学性质同时解决了这些问题。1，1，2，2，3，3-六氟丙烷-1，3-二磺酰亚胺（LiHFDF）在阳极和阴极表面均形成高度氟化的中间相，有效抑制锂枝晶的形成和多硫化物的溶解/穿梭，并显着提高LSB的电化学可逆性。在更广阔的背景下，这种新的锂盐为依赖锂金属阳极和活性阴极材料的锂离子化学以外的多元化提供了新的视角。