Recently, niobium tungsten oxide has garnered considerable attention owing to its excellent Li-ion diffusion rate and prominent structural stability during charge–discharge cycles. Here, a cathode material (LiNi_0.8Co_0.1Mn_0.1O₂, NCM811) for Li-ion batteries is successfully coated with Li-ion conductive Li_2.09W_0.9Nb_0.1O₄ using a simple wet-chemical coating method followed by high-temperature sintering. A physicochemical phase analysis reveals that a 4–5-nm-thick coating with a Li_2.09W_0.9Nb_0.1O₄ crystal structure is evenly distributed on the surface of the cathode particles. Among cathodes coated with different amounts of material, the one coated with 0.5 wt% Li_2.09W_0.9Nb_0.1O₄ yielded the best overall performance, with a high discharge capacity of 136.8 mAh g⁻¹ at 10 C and long-term cycling stability with a capacity retention of 91.7% after 100 cycles at 1 C. This excellent electrochemical performance can be attributed to the coating’s ability to prevent the impedance from increasing and the Li-ion diffusion coefficient from decaying. In addition, it protects the cathode from side reactions and stabilizes the structure during cycling.

近年来，铌钨氧化物因其优异的锂离子扩散速率和充放电循环中突出的结构稳定性而备受关注。在这里，采用简单的湿化学涂覆方法，然后通过高湿化学涂覆方法，成功地将锂离子传导性Li _2.09 W _0.9 Nb _0.1 O ₄涂覆在用于锂离子电池的正极材料（LiNi _0.8 Co _0.1 Mn _0.1 O ₂，NCM811）上。温度烧结。物化相分析表明，具有Li _2.09 W _0.9 Nb _0.1 O ₄的4-5 nm厚涂层晶体结构均匀地分布在阴极颗粒的表面上。在涂有不同量材料的阴极中，涂有0.5 wt％Li _2.09 W _0.9 Nb _0.1 O _4的阴极表现出最佳的整体性能，在10 C时具有136.8 mAh g ^-1的高放电容量和长期循环稳定性在1 C下进行100次循环后，其容量保持率为91.7％。这种出色的电化学性能可归因于涂层防止阻抗增加和Li离子扩散系数衰减的能力。另外，它保护阴极免受副反应并在循环过程中稳定结构。