Advanced Poly (Ether Ether Ketone) Separator for Lithium Metal Battery

after 1000 cycles at 3 C, and offers more than two times longer cycle life than that of other PEEK-based separators. Even at 70 °C, a high capacity retention rate of 84.2% is achieved after 200 cycles, ensuring battery safety in high-temperature environments. Different from the commonly used surface modification strategy for functional separators, the approach reported herein exhibits a fundamental advance in separator manufacturing for future high-safety LMBs.