The　practical　implementation　of　lithium-metal　anodes　in　high-energy-density　batteries　with　high-nickel　cathodes　requires　the　electrolytes　that　prevent　dendrite　growth,　enable　high　rate　performance,　and　provide　adequate　cathodic　stability.　Traditional　electrolytes,　however,　struggle　to　fulfill　these　requirements,　and　a　universal　electrolyte　design　rule　remains　lacking.　Herein,　we　introduce　a　hybrid　strongly-weakly-solvating　solvent　(HSWSS)　rule,　based　on　Raman　shifts　and　dielectric　constants　of　solvents,　to　rationally　design　a　multi-component　hierarchically-solvating　electrolyte　(HSE)　with　a　wide　electrochemical　window　(＞4.45　V),　decent　ionic　conductivity　(4.28　mS　cm−1),　and　dendrite　suppression　ability.　By　introducing　strongly-solvating　cosolvent　and　appropriate　Li　salts　into　weakly　solvating　solvent,　the　HSE　enable　the　Li||LiNi0.8Co0.1Mn0.1O2　cell　(1.8　mAh　cm−2,　with　3　times　excess　ultrathin　Li　metal)　to　exhibit　a　high　capacity　retention　of　74.3　%　after　150　cycles　at　1　C　with　a　remarkable　high　Coulombic　efficiency　of　99.60　%.　HSEs　can　also　be　conveniently　prepared　using　commercially　available　solvents　and　salts,　making　them　practical　and　cost　effective　for　large-scale　lithium-metal　battery　manufacturing.　As　a　result,　this　rational　design　offers　a　new　direction　for　the　development　of　advanced　electrolytes　in　high-energy-density　lithium-metal　batteries.　©　2023　Elsevier　B.V.