Lithium (Li) metal batteries (LMBs) are regarded as promising next-generation energy storage system owing to their high theoretical energy density. However, conventional polyolefin separators widely used in LMBs exhibit poor cycling stability due to their inherently hydrophobic nature. A conventional approach to mitigate this issue involves applying a micrometer-thick ceramic coating layer (CCL) through slurry-based coating methods, but this often compromises the energy density and power performance due to increased separator's mass, thickness and Gurley number. In this study, dry-biaxially stretched polypropylene separators (DB-PP) fabricated via flow/stress-induced crystallization provide a high porous and low tortuous pore network thereby resulting in low resistance, inherently supporting high-rate operation. Nevertheless, their poor mechanical robustness and high porosity make them susceptible to internal short circuits (ISCs), thereby limiting long-term cycling stability. Here, we retain the intrinsic pore structure of the DB-PP and stabilize the interface with a nanometer-scale Al₂O₃ coating applied by radio frequency (RF) sputtering method. The ultra-thin, binder-free ceramic-coated DB-PP (i.e., C-DB-PP) preserves the microstructure while enhancing electrolyte wettability and Li+ flux uniformity. As a result, Li||NCM622 cells sustain superior high-rate capacity and long-term stability, maintaining over 72% of the initial discharge capacity even after 600 cycles, whereas the DB-PP-based cell exhibits a sharp capacity decay after 400 cycles.