Journal Article 2D molecular brushes DFT calculations carbon anodes carbon nanosheets diffusion kinetics high‐rate performance high‐voltage lithium metal battery ion conductivity layer-by-layer stacking lithium metal anodes lithium metal batteries lithium-metal batteries lithium-sulfur batteries mechanical strength polymer brush polymer brushes polymeric membranes potassium‐ion batteries quasi-solid-state polymer electrolytes quasi‐solid‐state polymer electrolyte shield defense sulfur hosts topological defects