Layered　ternary　lithium-ion　batteries　LiNixCoyMnzO2　(NCM)　and　LiNixCoyAlzO2　(NCA)　have　become　mainstream　power　batteries　due　to　their　large　specific　capacity,　low　cost,　and　high　energy　density.　However,　these　layered　ternary　lithium-ion　batteries　still　have　electrochemical　cycling　problems　such　as　rapid　capacity　decline　and　poor　thermal　stability.　These　problems　are　mainly　caused　by　(1)　irreversible　phase　transition,　(2)　crack　and　pulverization　of　cathode　electrode　material　particles,　(3)　dissolution　of　transition　metal　elements,　(4)　oxidative　decomposition　of　electrolyte　and　(5)　repeated　growth　and　thickening　of　the　SEI　film　on　the　anode　electrode.　In　order　to　solve　these　problems,　various　strategies　based　on　doping　and　coating　of　the　cathode　material,　design　of　electrolyte,　and　anode　coating　have　been　studied　to　effectively　stabilize　the　NCM/NCA　cathode　and　achieve　the　purpose　of　improving　its　electrochemical　cycling　performance.　This　review　briefly　describes　the　working　principle　of　lithium-ion　batteries,　the　composition　and　structure　of　NCM/NCA　cathode　materials　and　the　roles　of　transition　metal　elements.　The　capacity　degradation　mechanism　of　layered　ternary　lithium-ion　batteries　is　reviewed　from　the　perspectives　of　cathode,　electrolyte　and　anode,　and　the　research　progress　in　the　modification　of　cathode　materials　is　emphatically　discussed.　Advances　in　the　modification　of　anode　materials　and　electrolyte　design　are　also　briefly　introduced.　Finally,　some　challenges　and　prospects　are　proposed　for　the　future　development　of　layered　ternary　lithium-ion　batteries.