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LiNi0.8Co0.2O2 particles were modified by Co3(PO4)2 coating.The effects of the Co3(PO4)2 coating on the structure and electrochemical properties of the LiNi0.8Co0.2O2 cathode material were investigated.The Co3(PO4)2 coating forms a thin layer on the surface of the LiNi0.8Co0.2O2 material and a solid solution by interacting with the LiNi0.8Co0.2O2 core material during calcination at 700℃ for 4 h.Charge-discharge experiment results show that the Co3(PO4)2 coating improves the cycling stability of the LiNi0.8Co0.2O2 cathode material,The capacity retention of the pristine LiNi0.8Co0.2O2 cathode after 50 cycles is 83.6%,whereas it is 91.7% in the case of the LiNi0.8Co0.2O2 cathode coated with 1 wt.% Co3(PO4)2.Storage tests of the 4.35 V charged electrode at 60℃ after a month show that the Co3(PO4)2-coated sample exhibits good storage properties compared with the pristine sample.