Lithium-rich　layered　oxides　(LLOs)　are　fascinating　high-energy-density　cathode　materials　for　next-generation　lithium-ion　batteries　(LIBs).　However,　the　high　voltage　causes　severe　decomposition　of　conventional　carbonate-based　electrolytes　at　LLOs＇　surfaces,　often　producing　a　non-uniform,　unstable,　and　non-protective　cathode-electrolyte　interphase　(CEI),　hindering　the　Li+　diffusion　and　reducing　the　electrochemical　efficiency.　Various　side　reactions,　such　as　the　release　of　lattice　oxygen,　dissolution　of　transition　metals　(especially　manganese),　and　irreversible　structural　transformations,　also　occur　and　severely　attenuate　the　electrochemical　performance.　Electrolyte　additives　provide　a　facile　and　effective　approach　to　optimize　the　battery　performance　by　in　situ　regulating　the　physical/chemical　structures/properties　of　CEI.　This　paper　reviews　the　research　progress　in　functional　electrolyte　additives　for　LLOs　and　discusses　the　mechanisms　of　CEI　construction　with　diverse　functions.　Finally,　we　tentatively　propose　suggestions　to　construct　CEI　by　screening　and　customizing　electrolyte　additives　to　promote　the　large-scale　application　of　LLOs　for　LIBs.