High-end battery applications: Aluminum oxide coating on lithium-ion battery cathode materials shows significant effects. When coated with aluminum oxide, a large amount of Co3+ in the LiCoO2 structure transforms into Co4+ upon charging to high voltage, leading to the formation of oxygen vacancies and weakening the bonding force between excess metal and oxygen, causing Co4+ to dissolve in the electrolyte. After coating the LiCoO2 surface with nano-alumina (VK-L30D), the LiCoO2 and nano-Al2O3 react during the charging and discharging process.
(2) Aluminum Oxide Coating. High-end battery-grade aluminum oxide, on the other hand, if the material comes into direct contact with the electrolyte, the strongly oxidizing Co4+ ions will react with the electrolyte, leading to capacity loss. Coating the nanoparticles of Al2O3 (VK-L30D) can prevent direct contact between LiCoO2 and the electrolyte, reduce capacity loss, thereby enhancing the electrochemical specific capacity of LiCoO2 material and improving its cycling performance.
