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LiNi_0.8Co_0.1Mn_0.1O₂ cathode materials were prepared by a high-temperature solid-phase reaction method with Four different lithium salts (LiOH.H₂O, Li₂CO₃, LiNO₃, CH₃COOLi) as lithium sources. The microstructure of the LiNi_0.8Co_0.1Mn_0.1O₂ materials was characterized by X-ray powder diffraction (XRD) and field emission electron microscopy (FESEM). The results demonstrated that the size of all the four synthesized LiNi_0.8Co_0.1Mn0.1O₂ samples were micrometers size, with a layered structure (R-3m space group). The electrochemical test results showed that the electrochemical performance of LiNi_0.8Co_0.1Mn_0.1O₂ samples prepared with different lithium sources is very different. Among them, the LiNi_0.8Co_0.1Mn_0.1O₂ sample prepared with LiOH?H₂O as lithium source (pre-sintering at 500 °C for 6 h and sintering at 800 °C for 16 h) exhibited the lowest degree of lithium-nickel mixing and the best electrochemical performance. For example, its reversible specific capacity is as high as 206.2 mA.h/g at a rate of 0.1 C (1 C=180 mA/g), and its reversible specific capacity remains 80.9 mA.h/g at a rate of 10 C; During 100 charge-discharge cycles at a rate of 0.5 C, the highest specific discharge capacity was 176.2 mA.h/g, and the average specific discharge capacity was 140.1 mA.h/g. The analysis of kinetics and electrode stability revealled that the LiNi_0.8Co_0.1Mn_0.1O₂ sample prepared with LiOH?H₂O as lithium source possessed the best electrochemical reversibility, highest Li^₊ diffusion coefficient, and superior structural stability during charge-discharge cycling.