LiNi_0.6Co_0.2Mn_0.2O₂ (NCM) is a highly potential cathode material for lithium-ion batteries (LIBs). However, its poor rate capability and cycling performance at high cutoff voltages have seriously hindered further commercialization. In this study, we successfully design an ultra-thin lithium aluminum oxide (LiAlO₂) coating on NCM for LIBs. Compared to Al₂O₃, the utilization of lithium-ion conducting LiAlO₂ significantly improves the NCM performance at high cutoff voltages of 4.5/4.7 V. The study reveals that the LiAlO₂-coated NCM can maintain a reversible capacity of more than 149 mA h g⁻¹ after 350 cycles with 0.078% decay per cycle. Furthermore, LiAlO₂-coated NCM exhibits higher rate capacities [206.8 mA h g⁻¹ at 0.2 C (50 mA g⁻¹) and 142 mA h g⁻¹ at 3 C] than the Al₂O₃-coated NCM (196.9 mA h g⁻¹ at 0.2 C and 131.9 mA h g⁻¹ at 3 C). Our study demonstrates that the ultra-thin LiAlO₂ coating is superior to Al₂O₃ and significantly improves the capacity retention and rate capability of NCM for LIBs.

LiNi _0.6 Co _0.2 Mn _0.2 O ₂（NCM）是用于锂离子电池（LIB）的高电势阴极材料。然而，其差的速率能力和在高截止电压下的循环性能严重阻碍了进一步的商业化。在这项研究中，我们成功地在NCM上设计了用于LIB的超薄锂氧化铝（LiAlO ₂）涂层。与Al ₂ O ₃相比，使用锂离子导电LiAlO _2可以显着提高4.5 / 4.7 V的高截止电压下的NCM性能。研究表明，涂覆LiAlO ₂的NCM可以保持149以上的可逆容量。毫安汞柱^-1350个周期后，每个周期衰减0.078％。此外，与涂有Al ₂ O ₃的NCM（196.9 mA h g ）相比，涂有LiAlO ₂的NCM表现出更高的倍率容量[在0.2 C下为206.8 mA h g ^-1（50 mA g ^-1）和在3 C时为142 mA h g ^-1 ]。^-1以0.2C和131.9毫安ħ克^-1以3℃）。我们的研究表明，超薄LiAlO ₂涂层优于Al ₂ O _3，并显着提高了NCM对LIB的容量保持率和倍率能力。