An organic/inorganic hybrid coating consisting of molecular sieve (MS)/sulfonated melamine formaldehyde condensate (SMF) is fabricated on the polyethylene (PE) separator by a simple dip-coating process. The MS/SMF coating with high polarity enhances the electrolyte uptake of PE separator, and therefore favors higher ionic conductivity and Li⁺ transference number of separators. By regulating the ratio of MS/SMF, much higher Li⁺ transference number up to 0.5 can be obtained compared with the original PE separator (0.25). The PE separator possesses highest effective Li⁺ ionic conductivity when the ratio of MS/SMF is 3:1, which promotes more uniform Li⁺ deposition on the lithium metal surface for excellent lithium plating/stripping cycling stability up to 1000 h without any signs of short-circuit. Moreover, the functional PE separator possesses excellent H₂O and HF capturing ability due to strong adsorption of MS and SMF for H₂O and the scavenging of SMF for HF. The MS-SMF@PE separator-employed LiCoO₂/Li unit cell shows superior C-rates capability and cycling performance, and no obvious lithium dendrite growth is found on the surface of lithium metal anode after cycling.

通过简单的浸涂工艺在聚乙烯 (PE) 隔膜上制备由分子筛 (MS)/磺化三聚氰胺甲醛缩合物 (SMF) 组成的有机/无机混合涂层。具有高极性的 MS/SMF 涂层增强了 PE 隔膜的电解质吸收，因此有利于隔膜的更高离子电导率和 Li ⁺转移数。通过调节 MS/SMF 的比例，与原始 PE 隔膜 (0.25) 相比，可以获得高达 0.5 的更高的 Li ⁺转移数。当 MS/SMF 的比例为 3:1 时，PE 隔膜具有最高的有效 Li ⁺离子电导率，这促进了更均匀的 Li ⁺沉积在锂金属表面，可实现长达 1000 小时的优异锂电镀/剥离循环稳定性，且没有任何短路迹象。此外，由于 MS 和 SMF 对 H ₂ O 的强吸附和SMF 对 HF 的清除，功能性 PE 隔膜具有优异的 H ₂ O 和 HF 捕获能力。采用MS-SMF@PE隔膜的LiCoO ₂ /Li单元电池显示出优异的C-rates能力和循环性能，循环后锂金属负极表面未发现明显的锂枝晶生长。