Lithium　ion　battery　cathode　material　LiNi0.8Co0.1Mn0.1O2　(NCM811)　was　synthesized　via　a　spray　drying　method.　The　effect　of　different　spray　drying　flow-rates　(200,　250,　300,　and　400　mL·min-1)　on　the　structural　and　electrochemical　properties　of　NCM811　are　investigated.　We　find　that　the　contents　of　Ni,　Co,　and　Mn　in　the　NCM811　cathode　materials　do　not　change　significantly　with　the　changing　flow-rate,　but　the　lattice　parameter　and　morphology　of　the　materials　are　significantly　affected.　Under　the　optimal　spray　drying　flow-rate　(250　mL·min　-1),　the　obtained　NCM811　cathode　(250NCM811)　exhibits　the　best　crystallinity,　with　the　highest　ratio　of　I(003)/I(104)　in　the　XRD　pattern.　SEM　images　reveal　the　spherical　morphology　of　250NCM811　and　the　average　diameter　of　about　5　μm.　The　results　of　electrochemical　test　show　that　the　reversible　capacity　of　250NCM811　reaches　210　mA·g-1　at　0.2　C　(1　C　=　280　mA·g-1).　After　100　charge-discharge　cycles　at　1　C,　the　battery　retains　more　than　94%　of　its　initial　capacity.　Overall,　spray　drying　flow-rate　demonstrates　great　effect　on　the　electrochemical　properties　of　NCM811.　©　2020　Fujian　Institute　of　Research　of　the　Structure　of　Matter.　All　rights　reserved.