The　voltage　decay　of　lithium-rich　layered　oxides　(LLOs)　is　still　one　of　the　key　challenges　for　their　application　in　commercial　battery　although　these　materials　possess　the　advantages　of　high　specific　capacity　and　low　cost.　In　this　work,　the　relationship　between　voltage　decay　and　tap　density　of　LLOs　has　been　focused.　The　voltage　decay　can　be　significantly　suppressed　with　the　increasing　tap　density　as　well　as　the　homogenization　of　the　primary　or　secondary　particle　size　of　agglomerated　spherical　LLOs.　Experimental　results　have　shown　that　an　extreme　small　voltage　decay　of　0.98　mV　cycle(-1)　can　be　obtained　through　adjusting　the　tap　density　of　agglomerated　spherical　LLOs　to　1.99　g　cm(-3),　in　which　the　size　of　primary　and　secondary　particles　are　uniform.　Our　work　offers　a　new　insight　towards　the　voltage　decay　and　capacity　fading　of　LLOs　through　precursor　preparation　process,　promoting　their　application　in　the　real　battery　in　the　future.　(C)　2020　Published　by　Elsevier　Ltd　on　behalf　of　The　editorial　office　of　Journal　of　Materials　Science　&　Technology.