Poor stability of lithium metal anodes in liquid electrolytes hinders its practical application in rechargeable batteries with very high energy density. Herein, we present an approach to tackle the intrinsic problems of Li metal anodes from the standpoint of separators. By a facile and versatile method based on mussel-inspired surface chemistry, a hybrid polydopamine/octaammonium POSS (PDA/POSS) coating was spontaneously formed on the surface of PE separators through the self-polymerization and strong adhesion feature of dopamine. This ultrathin PDA/POSS coating endows PE separators with different surface characteristics while keeping its microporous structure almost unchanged. The altered surface characteristics influence the separator/electrolyte interaction, and lead to remarkable enhanced ionic conductivity (from 0.36 mS cm⁻¹ to 0.45 mS cm⁻¹) and Li⁺ ion transference number (from 0.37 to 0.47) of PE separators as well as the improved stability of lithium/electrolyte interface, which effectively decreases the electrode polarization and suppresses the lithium dendrites formation, contributing to superior C-rates capability and cycling performance of cells.

锂金属阳极在液体电解质中的稳定性差，阻碍了其在具有很高能量密度的可再充电电池中的实际应用。本文中，我们从隔板的角度提出了解决锂金属阳极固有问题的方法。通过一种基于贻贝启发的表面化学的简便而通用的方法，通过多巴胺的自聚合和强粘附特性，在PE隔板的表面自发形成了聚多巴胺/八铵POSS（PDA / POSS）杂化涂层。这种超薄的PDA / POSS涂层赋予PE隔膜不同的表面特性，同时保持其微孔结构几乎不变。改变的表面特性会影响隔板/电解质的相互作用，并导致离子电导率显着提高（从0.36 mS cm起）PE隔膜的^-1至0.45 mS cm ^-1）和Li ⁺离子转移数（0.37至0.47）以及改善的锂/电解质界面稳定性，从而有效降低电极极化并抑制锂枝晶的形成，从而有助于具有卓越的C速率能力和电池的循环性能。