LiNi_0.8Co_0.1Mn_0.1O₂ (NCM) materials with surface modification by Li₂TiO₃ (LTO), Li₂ZrO₃ (LZO) and Li₂TiO₃-Li₂ZrO₃ (LTZO) coatings are successfully synthesized via a simple wet chemical method and proper heat-treatment process. The crystal structure, surface morphology, valence states and electrochemical properties of different modified NCM materials are investigated by the means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The NCM co-modified by Li₂TiO₃ and Li₂ZrO₃ composite coatings (LTZO@NCM) shows remarkable improvements in cycling performance and rate capability, the discharge capacity is 190.36 mAh g⁻¹ with high capacity retention of 92.64% at 0.2C after 100 cycles between 2.75 and 4.4 V, compared to 174.83 mAh g⁻¹ with the capacity retention of 87.20% for pristine NCM. Even at a high current density of 1 C, LTZO@NCM still maintains a high discharge capacity of 149.77 mAh g⁻¹ cycled at high cut-off voltage of 4.4 V, with a capacity retention rate of 83.04% at 150th cycle, while bare NCM only delivers 123.92 mAh g⁻¹ with capacity retention of 68.86%. The enhanced electrochemical performance can be ascribed to the modified effect of LTZO nano-coating layer on the NCM surface. LTZO nano-coating layer can not only effectively protect NCM particles, avoid the occurrence of side reaction, but also provide a better Li⁺ transport channels, improve lithium ion diffusion rate and enhance the structure stability and electrochemical performances of NCM material.

具有Li ₂ TiO ₃（LTO），Li ₂ ZrO ₃（LZO）和Li ₂ TiO ₃ -Li ₂ ZrO ₃表面改性的LiNi _0.8 Co _0.1 Mn _0.1 O ₂（NCM）材料（LTZO）涂层是通过简单的湿化学方法和适当的热处理工艺成功合成的。通过X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM）和X射线光电子能谱研究了不同改性NCM材料的晶体结构，表面形态，价态和电化学性能。 （XPS）。由Li ₂ TiO ₃和Li ₂ ZrO ₃复合涂层（LTZO @ NCM）共改性的NCM在循环性能和倍率性能方面显示出显着改善，放电容量为190.36 mAh g ^-1，在0.2下的容量保持率高达92.64％ C在2.75和4.4 V之间经过100次循环后的电量，而174.83 mAh g^-1，原始NCM的容量保留率为87.20％。即使在1 C的高电流密度下，LTZO @ NCM仍保持149.77 mAh g ^-1的高放电容量，在4.4 V的高截止电压下循环，在第150次循环时的容量保持率为83.04％，而裸露NCM仅提供123.92 mAh g ^-1，容量保持率为68.86％。增强的电化学性能可归因于LTZO纳米涂层在NCM表面上的改进作用。LTZO纳米涂层不仅可以有效保护NCM颗粒，避免副反应的发生，而且还提供了更好的Li ⁺传输通道，提高了锂离子的扩散速率，增强了NCM材料的结构稳定性和电化学性能。