The article reviews recent advancements in advanced separators for lithium-ion batteries (LIBs), addressing the challenges of low energy density, limited durability, and safety concerns. The development of innovative separators is crucial for designing more sustainable and reliable energy storage systems. The review categorizes advanced separators into three types: modified polymeric separators, composite separators, and inorganic separators. It discusses the fabrication methods, including dry- and wet-processed stretching techniques, and highlights the importance of separators in ensuring the safe and stable operation of LIBs. The review also outlines future challenges and directions for the development of advanced separators, emphasizing the need for separators with enhanced chemical stability, wettability, thermal stability, mechanical strength, and porosity.The article reviews recent advancements in advanced separators for lithium-ion batteries (LIBs), addressing the challenges of low energy density, limited durability, and safety concerns. The development of innovative separators is crucial for designing more sustainable and reliable energy storage systems. The review categorizes advanced separators into three types: modified polymeric separators, composite separators, and inorganic separators. It discusses the fabrication methods, including dry- and wet-processed stretching techniques, and highlights the importance of separators in ensuring the safe and stable operation of LIBs. The review also outlines future challenges and directions for the development of advanced separators, emphasizing the need for separators with enhanced chemical stability, wettability, thermal stability, mechanical strength, and porosity.