Lithium　(Li)　metal　batteries　have　garnered　significant　attention　due　to　their　high　energy　density.　However,　the　safety　concerns　associated　with　Li-metal　batteries　need　to　be　addressed　for　their　commercial　viability.　Most　research　has　focused　on　the　safety　of　separators　and　electrolytes,　yet　little　emphasis　is　placed　on　the　heat　safety　of　lithium　metal.　In　an　out-of-control　scenario,　the　combustion　of　lithium　metal　can　release　significantly　more　heat　compared　to　other　components.　In　this　study,　a　highly　safe　composite　Li　metal　anode　is　introduced　fabricated　by　repeatedly　rolling　copper　(Cu)　powder　and　lithium　metal.　Electrochemical　tests　show　that　the　Cu/Li　anode　can　withstand　up　to　200　cycles,　far　surpassing　the　50-cycle　lifespan　of　conventional　Li　metal　anodes.　Safety　test　results　indicate　that　the　Li/Cu　composite　anode　possesses　self-extinguishing　properties,　significantly　mitigating　the　safety　risks　associated　with　lithium　metal　batteries.　Thermal　runaway　tests　on　the　1.0　Ah　pouch　cell　demonstrate　that　the　Li/Cu　composite　anode　exhibits　excellent　safety　characteristics,　effectively　inhibiting　thermal　runaway　phenomena.　The　proposed　straightforward,　and　high-safety　Li/Cu　composite　anode　can　enhance　the　safety　profile　of　lithium　metal　batteries　and　provide　crucial　technical　support　for　their　industrial　application.　©　2025　Wiley-VCH　GmbH.