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Lithium(Li)metal is a promising anode for the next generation high-energy-density batteries.However,the growth of Li dendrites,low coulombic efficiency and dramatic volume change limit its development.Here,we report a new synthetic poly-dioxolane(PDOL)approach to constructing an artificial\'elastic\'SEI to stabilize the Li/electrolyte interface and the Li deposition/dissolution behavior in a variety of elec-trolytes.By coating PDOL with optimized molecular weights and synthetic routes on Li metal anode,the\'elastic\'SEI layer could be maintained on top of the Li metal anode to accommodate the Li deposi-tion/dissolution.No dendrite formation was observed during the cycling process,and the interfacial side reactions were reduced significantly.Consequently,we successfully achieved 330 cycles with a CE of 98.4%in ether electrolytes and 90 cycles with a CE of 94.3%in carbonate electrolytes.Simultaneously,the Li-metal batteries with LiFePO4 as cathodes also exhibited improved cycling performance.This strat-egy could promote the development of dendrite-free metal anodes toward high-performance Li-metal batteries.