Abstract: In this experiment, LiNi_0.8Co_0.1Mn_0.1O₂ cathode material was synthesized by sol-gel method. The effects of different lithium ratios and different sintering temperatures on the morphology and electrochemical properties of the cathode materials were investigated. The results of electrochemical performance show that when the lithium is over 13% and the sintering temperature is 800 ℃, the electrochemical performance is better, the first discharge specific capacity is 179.89 mAh/g, and the capacity retention rate is 94.72% after 0.2C cycle 20 times. At this time, the material has the smallest electrode polarization, the most stable crystal structure, and the best cycle reversibility. XRD and TEM analysis results show that the LiNi_0.8Co_0.1Mn_0.1O₂ cathode material has good crystallinity, and has a good a-NaFeO₂ layered structure, and the resulting material has an irregular block shape.