Coating　a　carbon　layer　on　the　surface　of　the　current　collector　can　enhance　the　performance　of　lithium-ion　batteries　by　improving　the　interfacial　conductivity　and　the　adhesion　of　the　active　material.　However,　traditional　carbon-coated　copper　foil　uses　hydrophobic　graphite　as　the　conductive　material,　which　has　poor　dispersion　and　adhesion　to　the　binder,　and　the　preparation　process　requires　the　use　of　environmentally　harmful　organic　solvents.　In　this　work,　carboxylated　carbon　nanosheets　(CCN)　are　synthesized　via　a　simplified　ball-milling　method　utilizing　graphite　and　dry　ice　as　starting　materials,　and　a　water-based　carbon　slurry　is　formulated,　employing　environmentally　friendly　deionized　water　as　the　solvent.　By　coating　the　CCN-coated　copper　foil　surface　with　a　commercially　proportioned　graphite　slurry,　we　fabricate　electrodes　that　exhibit　exceptional　rate　performance　and　cycle　stability.　In　situ　impedance　combined　with　the　distribution　of　relaxation　times　analysis　reveals　that　the　CCN　layer　between　the　active　material　and　the　copper　foil　not　only　ensures　a　stable　and　fast　conductive　connection　but　also　reduces　side　reactions　caused　by　uneven　lithiation.　This　work　provides　insights　into　the　rational　design　of　battery　structures　and　the　preparation　of　environmentally　friendly　carbon　slurries.　©　2025　American　Chemical　Society.