Effect of sintering temperature on properties of LiNi_0.8Co_0.1Mn_0.1O₂ material synthesized by sol-gel method

LiNi_0.8Co_0.1Mn_0.1O₂ cathode materials were prepared by sol-gel method. The structure, morphology and electrochemical performance of the materials synthesized by the different sintering temperature were characterized through XRD, SEM and constant current charge and discharge tests. The results show that all the materials are characterized by a typical α-NaFeO₂ layered structure with good cation order. The morphology of the cathode materials shows irregular block shape. The particle size increases with the higher sintering temperature. At the same time, the crystal face is not well developed with poor crystallinity when the sintering temperature is lower than 780 ℃. However, the primary particles are easy to agglomerate when the sintering temperature is higher than 800 ℃. The cathode materials sintered at 800 ℃ has the best electrochemical performance: the first discharge specific capacity is 147.95 mAh/g at 5 C high rate charge and discharge after 200 cycles. The capacity retention rate reaches 76.71%.