Li[Li_(0.2)Ni_(0.13)Co_(0.13)Mn_(0.54)]O_2 cathode materials were synthesized by carbonate-based co-precipitation method, and then, its surface was coated by thin layers of FePO_4. The prepared samples were characterized by X-ray diffraction(XRD), field emission scanning electron microscope(FESEM), energy-dispersive spectroscopy(EDS), and transmission electron microscopy(TEM). The XRD and TEM results suggest that both the pristine and the coated materials have a hexagonal layered structure, and the FePO_4 coating layer does not make any major change in the crystal structure. The FePO_4-coated sample exhibits both improved initial discharge capacity and columbic efficiency compared to the pristine one. More significantly, the FePO_4 coating layer has a much positive influence on the cycling performance. The FePO_4 -coated sample exhibits capacity retention of 82 % after 100 cycles at 0.5 ℃ between 2.0 and 4.8 V, while only 28 % for the pristine one at the same charge-discharge condition. The electrochemical impedance spectroscopy(EIS) results indicate that this improved cycling performance could be ascribed to the presence of FePO_4 on the surface of Li[Li_(0.2)Ni_(0.13)Co_(0.13)Mn_(0.54)]O_2 particle, which helps to protect the cathode from chemical attacks by HF and thus suppresses the large increase in charge transfer resistance. Li [Li_ (0.2) Ni_ (0.13) Co_ (0.13) Mn_ (0.54)] O_2 cathode materials were synthesized by carbonate-based co-precipitation method, and then, the surface was coated by thin layers of FePO_4. characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), energy-dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The XRD and TEM results suggest that both the pristine and the coated materials have a hexagonal layered structure, and the FePO 4 coating layer does not make any major change in the crystal structure. The FePO 4-coated sample exhibits both improved initial discharge capacity and columbic efficiency compared to the pristine one. much positive influence on the cycling performance. The FePO 4 -coated sample exhibits the retention capacity of 82% after 100 cycles at 0.5 ° C between 2.0 and 4.8 V, while only 28% for the pristine one at the same charge-discharge conditi on. The electrochemical impedance spectroscopy (EIS) results indicate that this improved cycling performance could be ascribed to the presence of FePO 4 on the surface of Li [Li 0.2 Ni 0.13 Co 0.13 Mn 0.54] O 2 particle, which helps to protect the cathode from chemical attacks by HF and thus suppresses the large increase in charge transfer resistance.