Metallic　lithium　anode　is　considered　as　an　ideal　electrode　for　high-energy-density　batteries.　However,　the　uncontrollable　growth　of　lithium　dendrites,　large　volumetric　change,　and　interfacial　issues　during　the　repeated　plating　and　stripping　processes　severely　hinder　its　practical　applications.　Herein,　CoO　nanosheets-decorated　sponge　nickel　are　synthesized　as　a　host　skeleton　for　thermal-injected　Li　(LCN).　The　conductive　3D　matrix　serves　as　a　fast　electron　transfer　path　to　decrease　polarization　and　homogenize　the　local　current　density　to　suppress　the　Li　dendrite.　Moreover,　the　confined　framework　can　relieve　the　volume　change　of　lithium　metal　anodes.　Furthermore,　an　artificial　LiBr-LiF-rich　solid-electrolyte　interface　(SEI)　layer　is　constructed　at　the　surface　of　LCN　by　the　in　situ　spray-quenching　method.　Such　an　inorganic-rich　SEI　provides　fast　longitudinal　Li+　transportation　and　facilitates　the　uniform　deposition　of　lithium.　Accordingly,　the　SEI@Li/CoO@SN　(SLCN)　symmetrical　cells　exhibit　a　steady　overpotential　within　35　mV　for　1700　h　at　1　mA　cm(-2)/1　cm(-2)　and　achieve　high　Coulombic　efficiency　of　99.06%　after　150　cycles.　Matching　with　the　sulfur　cathode,　the　full　cells　present　promoted　rate　performance　and　cycling　stability　and　show　a　high　initial　capacity　of　1274　mAh　g(-1)　and　good　capacity　retention.