Modulating SEI formation tuning the solvation sheath for lithium metal batteries.

The solvation sheath of Li-glyme was modulated to enhance Li-TFSI association by adopting a highly polar solvent, especially water molecules, which affects the solid electrolyte interface (SEI) layer composition. By the Li-TFSI association, a TFSI anion-derived SEI layer is formed on the Li metal anode, resulting in higher Li metal anode efficiency.