Lithium-rich　layered　oxide　materials　are　extremely　important　for　improving　the　energy　density　of　lithium-ion　batteries.　However,　the　electrochemical　kinetics　and　cycle　stability　of　these　materials　are　still　not　good　enough　for　further　industrial　application.　Here,　the　effects　of　Nb　doping　on　the　crystalline　structure,　surface　chemistry,　cycle　stability,　and　electrochemical　kinetics　of　Li1.13Mn0.52Ni0.26Co0.10O2　are　studied.　Results　show　that　Nb　doping　can　significantly　promote　the　cycle　stability　and　electrochemical　kinetics　of　Li1.13Mn0.52Ni0.26Co0.10O2.　After　200　cycles,　the　discharge　capacity　retention　increases　from　59.2%　(pristine　material)　to　78.8%　(1%　Nb　element　doping)　with　obvious　enhanced　rate　performance.　Via　X-ray　diffraction,　scanning　electron　microscope,　energy　dispersive　spectroscopy,　X-ray　photoelectron　spectroscopy,　and　galvanostatic　intermittent　titration　analysis,　it　is　confirmed　that　Nb　element　has　been　successfully　doped　into　the　bulk　of　Li1.13Mn0.52Ni0.26Co0.10O2.　Doping　sites　of　Nb　element　in　structure　and　influence　on　lithium　migration　has　also　been　studied　by　the　Rietveld　refinement　and　first　principle　theoretical　calculation　methods.　Doped　Nb　element　efficiently　changes　the　lattice　parameters,　inhibits　the　resistance　rise,　accelerates　lithium　ion　diffusion,　and　finally　promotes　the　cycle　stability,　and　electrochemical　kinetics　of　Li1.13Mn0.52Ni0.26Co0.10O2.