A　new　generation　of　Li-rich　solid　solution　materials　is　cathode　material　xLi(2)MnO(3　center　dot)(1-x)LiMO2(M=Co,　Fe,　Ni1/2Mn1/2...)　because　of　its　excellent　electrochemical　performance.　The　series　of　Li-rich　cathode　material　exhibits　high　capacity　and　excellent;　cycleability,　which　may　be　associated　with　a　new　electrochemical　charge-discharge　mechanism,　It　is　proposed　to　satisfy　the　high　energy　Li-ion　batteries.　The　structure,　synthesis　methods　and　electrochemical　properties　of　the　Li-rich　cathode　materials　were　reviewed　in　this　paper.　The　factors　affecting　the　electrochemical　properties　of　the　cathode　materials　were　discussed,　and　the　recent　research　progress　on　improving　the　electrochemical　performance　of　Li-rich　cathode　materials　was　summarized.　In　addition,　the　characteristics　and　the　trend　of　different　Li-rich　cathode　materials　were　described.