Abstract
Forming uniform metal oxide nano-coating is a well-known challenge in the construction of coating materials. Herein, we demonstrate the effectiveness of Al2O3 coating on different kinds of core cathode active materials by a simple, facile method, forming a uniform surface-coating layer with thicknesses achieving nanometers precision. Typically, the uniform, nano-sized and controllable Al2O3 coating layer endows LiNi0.5Co0.2Mn0.3O2 cathode material with superior high-voltage cycling and thermal stability. The superior cycling stability can be attributed to the reduced side reactions, decreased polarization and suppressed dissolution of transition metals. In addition, we also confirm the coating effect for LiMn2O4 and LiNi0.8Co0.15Al0.05O2, the results show a similar improvement in the electrochemical performance to LiNi0.5Co0.2Mn0.3O2 at high temperature and high operating voltage.
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