The very high specific discharge capacities of Ni> 90% cathodes are often undone by their extremely poor cycle life and thermal stability. Herein, Ni-poor, and Al-rich particle with double concentration gradients is fabricated by synthesizing particles of the Ni-rich hydroxide Ni_0.9Co_0.1(OH)₂ in a highly efficient Taylor flow (TF) reactor and then depositing Al onto their surfaces using three methods: spray-drying and conventional wet and dry chemical coating. The uniformity of the surface distribution of Al on the Ni-rich transition metal oxide cathode materials affected the overall structural and electrochemical stability. Among our three systems, the cathode material prepared with the spray-dried Al exhibited the best performance, with an initial discharge capacity of 196.9 mA h g^–1 and capacity retention of 93% after 100 cycles at a rate of 1 C. It also demonstrated superior electrochemical performance at higher C-rates. For example, at 10 C, it delivered an initial discharge capacity of 134.4 mA h g^–1, compared with 56.8 mA h g^–1 for the Al-free LiNi_0.9Co_0.1O₂. We attribute this enhanced electrochemical performance to the presence of Al and its uniform distribution (through spray-drying processing) on the outer layer of the active material, with the Ni and Co elements remaining mainly within the core.

Ni> 90% 正极的非常高的比放电容量通常因其极差的循环寿命和热稳定性而被破坏。本文通过合成富镍氢氧化物 Ni _0.9 Co _0.1 (OH) _{2的颗粒制备了具有双浓度梯度的贫镍富铝颗粒。}在高效的泰勒流 (TF) 反应器中，然后使用三种方法将铝沉积到它们的表面上：喷雾干燥和传统的湿法和干法化学涂层。Al在富Ni过渡金属氧化物正极材料上表面分布的均匀性影响了整体结构和电化学稳定性。在我们的三个体系中，用喷雾干燥的 Al 制备的正极材料表现出最好的性能，其初始放电容量为 196.9 mAh g ^-1，在 1 C 的 100 次循环后容量保持率为 93%。它还证明了在更高的 C 速率下具有优异的电化学性能。例如，在 10 C 时，它的初始放电容量为 134.4 mAh g ^–1，而 56.8 mAh g ^–1对于无铝LiNi _0.9 Co _0.1 O ₂。我们将这种增强的电化学性能归因于 Al 的存在及其在活性材料外层的均匀分布（通过喷雾干燥处理），而 Ni 和 Co 元素主要保留在核心内。