LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) cathodes have attracted the attention of the automotive industry due to their higher capacity and operating voltage. Despite their promising electrochemical behavior, these materials do not have a stable cycling performance, as parasitic reactions take place when they come in contact with the electrolyte. Herein, amorphous Nb₂O₅ is applied as a multifunctional protective layer to stabilize the NCM811 interface, resulting in reduced surface contamination (Li₂CO₃), alleviation of transition metal (TM) ion dissolution, and suppression of surface corrosion and phase transformations during cycling. As a result, after 200 cycles, the coated NCM811 had a capacity of 180 mAh g⁻¹ displaying an excellent capacity retention of 85.7%, which is 30% higher than that of the uncoated samples. Similarly, the Nb₂O₅ coating allows for an enhanced rate capacity of 139 mAh g⁻¹ at 5 C, compared to 117.6 mAh g⁻¹ for the pure NCM811. In addition, the Nb₂O₅ coating effectively suppresses the voltage decay with cycling, resulting in a voltage decay of 70 mV after 200 cycles, while a reduction of 190 mV takes place without the coating.

LiNi _0.8 Co _0.1 Mn _0.1 O ₂ (NCM811)正极因其较高的容量和工作电压而引起了汽车行业的关注。尽管它们具有良好的电化学性能，但这些材料不具有稳定的循环性能，因为当它们与电解质接触时会发生寄生反应。在此，非晶 Nb ₂ O ₅用作多功能保护层以稳定 NCM811 界面，从而减少表面污染（Li ₂ CO ₃)，缓解过渡金属 (TM) 离子溶解，并抑制循环过程中的表面腐蚀和相变。结果，经过 200 次循环后，涂覆的 NCM811 的容量为 180 mAh g ^-1，具有 85.7% 的出色容量保持率，比未涂覆的样品高 30%。类似地，与纯 NCM811 的117.6 mAh g ^-1相比，Nb ₂ O ₅涂层在 5 C 时允许提高 139 mAh g ^{-1的倍率容量。}此外，Nb ₂ O ₅涂层有效地抑制了电压随循环的衰减，导致200次循环后电压衰减为70 mV，而没有涂层时电压衰减为190 mV。