Preparation and Performance of Regenerated Al(2)O(3)-Coated Cathode Material LiNi(0.8)Co(0.15)Al(0.05)O(2) from Spent Power Lithium-Ion Batteries

In this study, LiNi(0.8)Co(0.15)Al(0.05)O(2)@x%Al(2)O(3-)coated cathode materials were regeneratively compounded by the solid-phase sintering method, and their structural characterization and electrochemical performance were systematically analyzed. The regenerated ternary cathode material precursor synthesized by the co-precipitation method was roasted with lithium carbonate at a molar ratio of 1:1.1, and then completely mixed with different contents of aluminum hydroxide. The combined materials were then sintered at 800 °C for 15 h to obtain the regenerated coated cathode material, LiNi(0.8)Co(0.15)Al(0.05)O(2)@x%Al(2)O(3). The thermogravimetry analysis, phase composition, morphological characteristics, and other tests show that when the added content of aluminum hydroxide is 3%, the regenerated cathode material, LiNi(0.8)Co(0.15)Al(0.05)O(2)@1.5%Al(2)O(3,) exhibits the highest-order layered structure with Al(2)O(3) coating. This material can better inhibit the production of Ni(2+), and improve material structure and electrochemical properties. The first charge–discharge efficiency of the battery assembled with this regenerated cathode material is 97.4%, a 50-cycle capacity retention is 93.4%, and a 100-cycle capacity retention is 87.6%. The first charge–discharge efficiency is far better than that of the uncoated regenerated battery.