A combinatorial library of twenty-three, phase pure, near-NMC111 (LiNi_0·33Mn_0·33Co_0·33O₂) compositions were synthesised and their electrochemical performance, was mapped (in lithium ion half-cells). Each of the 23 compositions was made in series, using a two-step process of 1) a rapid initial continuous hydrothermal precipitation, followed by 2) solid state lithiation. The 23 lithiated NMC samples were then subjected to analytical methods including electron microscopy (selected samples), Powder X-ray Diffraction and electrochemical tests in half cell Li-ion configurations versus Li metal. A sample with a Ni:Mn:Co (NMC) ratio of 39:28:33, revealed a specific capacity of 150 mA h g⁻¹ at a C/20 rate, which was 63 and 43% greater capacity than NMC111 and NMC433 samples produced in this work, respectively. The sample with NMC ratio 47:25:28, showed the best capacity retention characteristics, retaining 70% of its C/20 capacity at 1C, after 40 cycles. Further analysis of all the samples by cyclic voltammetry and electrochemical impedance spectroscopy, allowed compositional mapping of diffusion coefficients. Overall, the mapping data revealed a gradual change of properties across compositional space, which has validated our combinatorial approach and allowed identification of the optimum performing near-NMC111 cathode materials.

合成了 23 种纯相近 NMC111（LiNi _0·33 Mn _0·33 Co _0·33 O ₂）组合物的组合库，并绘制了它们的电化学性能（在锂离子半电池中）。23 种组合物中的每一种都是串联制备的，使用两步工艺：1) 快速初始连续水热沉淀，然后是 2) 固态锂化。然后对 23 个锂化 NMC 样品进行分析，包括电子显微镜（选定的样品）、粉末 X 射线衍射和半电池锂离子配置与锂金属的电化学测试。Ni:Mn:Co (NMC) 比为 39:28:33 的样品显示比容量为 150 mA hg ^-1 以 C/20 的速率，分别比本工作中生产的 NMC111 和 NMC433 样品的容量高 63% 和 43%。NMC 比为 47:25:28 的样品表现出最佳的容量保持特性，在 40 次循环后，在 1C 时保持其 C/20 容量的 70%。通过循环伏安法和电化学阻抗谱对所有样品进行进一步分析，可以绘制扩散系数的组成图。总体而言，映射数据揭示了整个组成空间的性质逐渐变化，这验证了我们的组合方法并允许识别最佳性能的近 NMC111 正极材料。