With　the　development　of　the　times,　the　energy　density　of　cathodes　can　no　longer　meet　the　requirement　of　the　society,　which　has　greatly　limited　the　commercialization　process　of　Ni-rich　cathodes.　Doping　combined　with　coating　is　a　perfect　approach　to　improve　the　performance　of　Ni-rich　cathodes.　In　this　paper,　La　was　used　as　a　modified　element　to　realize　doping　in　the　layered　host　structure　as　well　as　La2O3　coating　on　the　surface.　To　further　enhance　the　interface　stability　of　LiNi0.8Co0.1Mn0.1O2,　F　was　also　employed　to　modify　the　surface,　so　as　to　change　the　coating　layer　from　oxide　(La2O3)　to　fluoride　(LaF3),　which　further　improved　the　surface　stability.　Additionally,　a　series　of　testing　instruments,　including　XRD,　EDS　mapping,　and　HRTEM,　were　employed,　which　suggested　that　a　small　amount　of　La　was　introduced　into　the　host　structure　as　a　pillar　to　the　stable　layered　structure,　and　there　was　an　uniform　LaF3　coating　layer　covered　on　the　Ni-rich　cathodes.　As　a　result,　the　electrochemical　performance　of　the　cathodes　was　greatly　improved,　with　the　capacity　retention　of　86.63%　and　80.79%　after　200　cycles　at　1　C　rate　and　300　cycles　at　8　C　rate,　respectively;　besides,　the　kinetics　of　lithium　diffusion　was　also　improved.