The stability of the interfacial layers depends mainly on the composition and distribution of the decomposition products from solid-state electrolytes (SSEs) in lithium metal batteries. Therefore, the design of SSEs becomes an attractive way to construct a homogeneous stable interfacial layer. Herein, pentafluorostyrene (PFS) as a block is used to generate robust interfacial layers for solid-state batteries. Meanwhile, PFS facilitates the dissociation of lithium salts to produce more free Li-ions which can enhance the ionic conductivity from the results of ⁷Li solid-state NMR spectra, density functional theory, and molecular dynamics calculations. Subsequently, XPS depth etching and TOF-SIMS characterizations together show that the gradient interfacial layer is composed of a rich C-F bond surface layer and a rich–LiF&Li₃N bottom layer, enabling rapid transport and uniform deposition of lithium ions. As a result, the Li/Li symmetric cell can achieve a stable ultra-long cycle time of more than 3000 h at 0.2 mA cm⁻² and a critical current density of 2.4 mA cm⁻². The as-prepared SSE exhibits a high ionic conductivity of 4.3 × 10⁻⁴ S cm⁻¹ at 25 °C and remarkable cycling stability at 0 °C and − 20 °C. Moreover, the lithium metal batteries based on as-prepared SSEs deliver high-rate (2 C) capability and high-voltage (NCM811) stability at room temperatures.

界面层的稳定性主要取决于锂金属电池中固态电解质（SSE）分解产物的组成和分布。因此，SSE 的设计成为构建均匀稳定界面层的一种有吸引力的方式。在此，五氟苯乙烯 (PFS) 作为块体用于为固态电池生成坚固的界面层。同时，PFS 促进锂盐的解离，产生更多的游离锂离子，从而提高离子电导率（⁷锂固态核磁共振光谱、密度泛函理论和分子动力学计算。随后，XPS 深度蚀刻和 TOF-SIMS 表征共同表明，梯度界面层由丰富的 CF 键表面层和丰富的-LiF&Li ₃ N 底层组成，能够实现锂离子的快速传输和均匀沉积。^{因此，Li/Li 对称电池在 0.2 mA cm -2和 2.4 mA cm -2}的临界电流密度下可以实现超过 3000 小时的稳定超长循环时间。所制备的 SSE 具有 4.3 × 10 ^-4 S cm ^{-1的高离子电导率}在 25 °C 下，在 0 °C 和 − 20 °C 下具有显着的循环稳定性。此外，基于所制备的 SSE 的锂金属电池在室温下具有高倍率 (2 C) 能力和高电压 (NCM811) 稳定性。