Dendrite　growth　and　high-voltage　capacity　fade　conundrums　persist　as　key　barriers　in　lithium-metal　batteries　(LMBs).　Although　LiNO3　effectively　optimizes　interfacial　chemistry　as　an　electrolyte　additive,　its　application　remains　hampered　by　limited　carbonate-electrolyte　solubility　and　self-depleting　behavior　during　extended　cycling.　This　study　presents　an　innovative　interfacial　engineering　strategy　through　the　strategic　incorporation　of　LiNO3-impregnated　hollow　mesoporous　silica　composites　(HMS@LiNO3)　onto　separator　surfaces　to　achieve　dual-interface　modulation.　Capitalizing　on　the　strong　adsorption　capability　of　HMS　within　the　high-dielectric　ethylene　carbonate,　a　nitrate-rich　solvation　structure　is　lastingly　established　at　the　anode　interface.　The　configuration　facilitates　the　formation　of　a　Li3N-enriched　solid　electrolyte　interphase　with　superior　ionic　conductivity,　effectively　enhancing　lithium　deposition　kinetics　while　inhibiting　dendritic　growth.　Concurrently,　the　cathode　interface　benefits　from　a　controlled　nitrate-lean　solvation　sheath　that　preferentially　undergoes　oxidative　decomposition,　generating　a　robust　protective　layer　to　mitigate　electrolyte　decomposition　under　4.5　V　operation.　As　a　result,　the　lifetime　in　Li　plating/stripping　exceeds　1800　h　and　the　average　Coulombic　efficiency　is　as　high　as　98.25　%　over　350　cycles.　The　matched　NCM811//Li　full　cell　exhibits　a　high-capacity　retention　rate　of　80.38　%　after　500　cycles　at　a　cut-off　voltage　of　4.5　V,　providing　valuable　guidance　into　the　development　of　long-life　high-voltage　LMBs.　©　2025