Al₂O₃包覆优化LiNi_0.8Co_0.1Mn_0.1O₂正极材料性能研究

通过原子层沉积工艺实现LLiNi_0.8Co_0.1Mn_0.1O₂颗粒表面的Al₂O₃包覆修饰，有效抑制了高镍三元正极材料与电解液的界面副反应，提升了其长循环稳定性。针对较厚的Al₂O₃包覆层可能阻碍锂离子传输动力学，影响正极材料倍率性能的问题，通过控制原子层沉积圈数，在界面稳定性和界面传输动力学两者间达到了优化平衡。实验结果表明，4圈原子层沉积的Al₂O₃包覆LiNi_0.8Co_0.1Mn_0.1O₂材料兼顾了循环稳定性和倍率性能。1C倍率下循环充放电60次后放电比容量为163.6 mAh/g，在10C倍率下仍具有高达162.6 mAh/g的放电比容量。包覆层厚度的精准控制有助于电极材料性能的最大化。

LiNi_0.8Co_0.1Mn_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..