Uncontrollable　dendrite　growth　during　the　repeated　plating　stripping　of　Li　ions　induces　short　cycle　life　and　safety　issues,　which　has　severely　impeded　the　practical　application　of　lithium　metal　battery.　It　is　acknowledged　that　the　solid　electrolyte　interphase　(SEI)　is　pivotal　for　Li　metal　anode　stabilization.　Here,　a　lithium　metal　anode　coated　with　an　artificial　SEI　film　as　the　working　electrode　is　applied.　The　TiO2　coating　layer　is　firstly　demonstrated　for　the　lithium　metal　anode　protection　via　atomic　layer　deposition　(ALD)　method.　Thanks　to　the　ultrathin　TiO2　layer,　dendritic　growth　is　suppressed　and　the　cycling　lifetime　is　significantly　improved.　Additionally,　the　thickness　of　TiO2　protective　layer　has　been　further　optimized.　Comparing　with　other　different　thickness　TiO2　layer,　5　nm　TiO2　layer　is　found　to　be　the　optimized　parameter　toward　capacity,　cycling　stability　and　rate　capability　in　both　symmetric　battery　system　and　full-cell　system.　The　TiO2　layer　promoted　uniform　deposition　of　Li+　and　effectively　inhibited　the　growth　of　lithium　dendrites.　Symmetric　Li/50TiO(2)parallel　to　Li/50TiO(2)　battery　could　cycle　stably　for　more　than　1600　h　at　1　mA　cm(-2),　and　more　than　500　hat　3　mA　cm(-2)　and　10　mA　cm(-2)　current　density.　The　Li/50TiO(2)parallel　to　NCM622　full-cell　exhibited　better　rate　performance　and　long-cycle　performance,　which　capacity　retention　was　increased　by　23.3%　compared　to　bare　electrode　after　100　cycles　at　0.5　C　charge-discharge　current　density.　Furthermore,　the　inherent　working　mechanism　of　TiO2　artificial　SEI　film　has　been　proposed.　This　work　provides　an　effective　and　new　alternative　method　for　lithium　metal　anodes　protection,　which　is　critical　for　the　future　design　of　next-generation　Li　metal　batteries　under　safe　operation.　(C)　2021　Elsevier　B.V.　All　rights　reserved.