Poor interfacial contact and Li dendritic growth severely restrict practical applications of Li metal anodes. Herein, we report a novel biomimetic solid-state electrolyte based on injection of 1 M LiTFSI-Py13TFSI ionic liquid electrolyte into a leaf-like Al₂O₃ skeleton through an in situ sol–gel method. This structure is intended to address the poor contact at the interface and protect the Li metal anode. A large amount of ionic liquid electrolyte was absorbed by the leaf-like Al₂O₃ skeleton owing to its high specific surface area. This system improved the ionic conductivity and promoted migration of Li⁺ both in the bulk and at the interface. The lithiophilic Al₂O₃ skeleton was in close contact with metallic Li and formed a fast Li⁺ conductive layer (Li–Al–O composition), which facilitated uniform deposition of Li and thus inhibited Li dendrite formation during long-term cycling. Moreover, density functional theory calculations indicated spontaneous generation of a Li–Al–O layer and [Py13]⁺ in the ionic liquid facilitates this process. Symmetric Li cells assembled with this electrolyte exhibited an extremely long cycle lifetime of 1100 h at a high constant current density. This strategy of a biomimetic leaf-structured electrolyte with a Li–Al–O conductive layer at the interface addresses problems of solid-state Li metal batteries and provides an alternative system for practical applications.

中文翻译：

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具有快速Li +导电界面的叶状Al2O3基准固体电解质，用于稳定的锂金属阳极

不良的界面接触和锂枝晶生长严重限制了锂金属阳极的实际应用。在这里，我们报道了一种新型的仿生固态电解质，它是通过原位溶胶-凝胶法将1 M LiTFSI-Py13TFSI离子液体电解质注入到叶片状的Al ₂ O ₃骨架中。该结构旨在解决界面处的不良接触并保护锂金属阳极。叶状的Al ₂ O ₃骨架由于比表面积大而被大量的离子液体电解质吸收。该系统改善了离子电导率并促进了Li ⁺在本体和界面处的迁移。亲硫的Al ₂O ₃骨架与金属Li紧密接触，并形成快速的Li ⁺导电层（Li-Al-O组成），这有助于Li的均匀沉积，从而抑制了长期循环过程中Li枝晶的形成。此外，密度泛函理论计算表明，Li-Al-O层的自发生成和离子液体中的[Py13] ⁺促进了这一过程。组装有这种电解质的对称锂电池在高恒定电流密度下表现出极长的1100 h循环寿命。这种在界面处具有Li–Al–O导电层的仿生叶子结构电解质的策略解决了固态Li金属电池的问题，并为实际应用提供了替代系统。