The composite solid electrolyte (CSE) is an ideal material for high-energy density solid-state lithium metal batteries. However, incompatibility between interfaces, and the free movement of anions in the polymer matrix result in severe concentration polarization, resulting in slow interfacial transport of Li⁺. Herein, a composite solid electrolyte (PEO/LiTFSI/Al₂O₃@PDA) was prepared by coating PDA on Al₂O₃ surface as a functional filler. Li⁺ travel the elaborately built polymer matrix, of which PDA as transport channel pulls Li⁺ migration, Al₂O₃ as ferry position regulate the Li⁺ flow. At the same time, PDA bifunctional surface coating can anchor anions, promote the decomposition of lithium salts, form more free lithium ions, weaken the complexation of PEO and Li⁺, and improve the transmission of Li⁺ at the ceramic/polymer interface. This work provides a reasonable design strategy for breaking through the limitations of composite solid-state electrolytes, which are also applicable to other composite solid-state electrolyte systems.

中文翻译：

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由复合固体电解质的锚定阴离子制成的链段渡轮工程可实现快速锂离子传输


复合固体电解质 （CSE） 是高能量密度固态锂金属电池的理想材料。然而，界面之间的不相容性以及聚合物基质中阴离子的自由运动导致严重的浓度极化，从而导致 Li⁺ 的界面传输缓慢。本文通过在 Al₂O₃ 表面涂覆 PDA 作为功能填料制备了复合固体电解质 （PEO/LiTFSI/Al₂O₃@PDA）。Li⁺ 在精心构建的聚合物基质中移动，其中 PDA 作为传输通道拉动 Li⁺ 迁移，Al₂O₃ 作为渡轮位置调节 Li⁺ 流动。同时，PDA 双功能表面涂层可以锚定阴离子，促进锂盐的分解，形成更多的游离锂离子，削弱 PEO 和 Li⁺ 的络合，提高 Li⁺ 在陶瓷/聚合物界面的传输。这项工作为突破复合固态电解质的局限性提供了一种合理的设计策略，也适用于其他复合固态电解质体系。