| As rich nickel cathode materials having high capacity and low cost, LiNi0.8Co0.15Al0.05O2was prepared by co-precipitation and high temperature calcination method with different sources of aluminum in this paper. The process conditions were studied, and the cathode materials prepared by different method were compared.In the experiment that A12(SO4)3was aluminium source, the way to adding Al2(SO4)3was mainly investigated and calcination process was studied by the orthogonal experiment. Results showed the best material’s tap density was only1.856g·cm-3, and the appearance was bad. Under the charge and discharge test with voltage range of2.7-4.2V and0.2C rate, the material respectively delivered the initial charge and discharge capacity of183.3,170.3mAh·g-1. After50cycles it retained139.7mAh·g-1discharge capacity, with the capacity retentivity of82.0%.For nano-Al2O3as aluminum source, the process of co-precipitation and calcination was systematically studied by the condition experiments. LiNi0.8Co0.15Al0.05O2synthesized under the optimum condition had integrity spherical morphology and the tap denstiy of the material reached2.37g·cm-3. It also had low degree of cationic mixed and complete α-NaFeO2layered structure. Under the charge and discharge test with the voltage range of2.7-4.2V and0.2C rate, the material respectively delivered the initial charge and discharge capacity of202.8,181.7mAh·g-1And it retained170·8mAh·g-1discharge capacity after50cycles, with an excellent capacity retentivity of94.0%. Its performances were superior to the materials synthesized with Al2(SO4)3. Therefore, with nano-Al2O3, through co-precipitation and high temperature calcination method to prepare LiNi0.8Co0.15Al0.05O2has certain development potential. |
