The migration of small polysulfide (LiPS) chains through the porous polymeric separators seriously jeopardizes the cycle life and energy density of lithium–sulfur (Li–S) batteries. Herein, we present a new concept in which an organic oligoaniline, amine-capped aniline trimer (ACAT), serves as an effective suppressor of the LiPS migration in Li–S cells. The strong interaction between LiPS and ACAT facilitates the formation of bulky ACAT–LiPS complexes (organoLiPS complexes), which are then size-selectively sieved by the porous polymeric separators employed in Li–S cells. Thus, the addition of ACAT significantly ameliorates the electrochemical performances of Li–S batteries due to suppressed LiPS migration. This new concept offers a viable strategy to achieve practically viable Li–S batteries.

中文翻译：

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寡苯胺作为锂硫电池中多硫化物穿梭的抑制剂

小多硫化物（LiPS）链通过多孔聚合物隔板的迁移严重危害了锂硫（Li–S）电池的循环寿命和能量密度。在这里，我们提出了一个新概念，其中有机低聚苯胺，胺基苯胺三聚体（ACAT）可作为LiPS细胞中LiPS迁移的有效抑制剂。LiPS和ACAT之间的强相互作用促进了庞大的ACAT-LiPS复合物（organoLiPS复合物）的形成，然后通过Li-S电池中使用的多孔聚合物隔板对分子筛进行大小选择。因此，由于抑制了LiPS的迁移，添加ACAT可以显着改善Li-S电池的电化学性能。这个新概念提供了一种可行的策略，以实现切实可行的Li-S电池。