Li[Mn1/3Co1/3Ni1/3]O2　cathode　material　for　lithium　ion　batteries　was　coated　by　CaF2　via　wet　coating　strategy.　The　CaF2-coated　Li[Mn1/3Co1/3Ni　1/3]O2　were　analyzed　by　X-ray　diffraction　spectra　(XRD),　the　scanning　electron　microscope　(SEM)　and　energy　dispersive　X-ray　analysis　(EDAX)　to　confirm　the　structure　and　morphology　of　cathode　material.　Cyclic　voltammetry　and　cycling　charge-discharge　measurements　were　carried　out　to　study　the　electrochemical　performance　of　bare　and　coated　samples,　as　well　as　the　optimal　coating　dosage.　Comparison　tests　have　found　that　the　capacity　retention　is　67.9%　for　bare　sample　and　93.5%　for　1.0　wt.%　CaF2-coated　sample.　In　summary,　the　CaF2　coating　strategy　benefits　the　cycling　performance　of　Li[Mn1/3Co1/3Ni1/3]O2　cathode　material,　and　the　optimal　dosage　of　coating　agent　is　1.0　wt.%.　©　2011　Elsevier　Ltd.　All　rights　reserved.