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Separator is a crucial component for flexible lithium‐ion batteries. In article number eom2.12126, Haipeng Yu and co‐workers realize a green and scalable modification for glass microfiber separators without any complex operations. Based on the gradient entropy diffusion effect of fluidic cellulose macromolecules, they successfully prepared a cellulose/glass microfiber composite film with high surface density, adjustable pore structure, good flexibility, strong mechanical properties, and anti‐disintegration performance. These properties promote the rapid ion transmission and inhibit the lithium dendrite growth. image