Improved performance of LiNi0.8Co0.1Mn0.1O2 via Al2O3 coating

Abstract: LiNi_0.8Co_{0. 1}Mn_0.1O₂ cathode was modified by Al₂O₃ coating via atomic layer deposition. Al₂O₃ coating layer prevents the reaction of the electrode with HF generated in the electrolyte, as well as metal dissolution, resulting in improving cycling stability. Nevertheless, too thick Al₂O₃ coating layer hinders the Li⁺ and electron conduction, resulting in poor rate performance. Four cycle Al₂O₃-coated LiNi_0.8Co_0.1Mn_0.1O₂ samples achieve a balance between the inhibition of interface side reaction and the kinetics of interface transport, resulting in best cycle stability and rate performance. Four cycle Al₂O₃- coated LiNi_0.8Co_0.1Mn_0.1O₂ cathode material can deliver an 60th discharge capacity of 163.6 mAh/g at 1C, and a superior discharge capacity of 162.6 mAh/g at 10C. The performance of electrode materials was maximized by the precise control of the coating thickness..

Key words: LiNi_0.8Co_0.1Mn_0.1O₂ ; atomic layer deposition; Al₂O₃ ; coating; cycling stability; rate performance