Li-ion diffusion is of great importance in Li-ion batteries. The synthesis method is a significant factor that affects the crystal structure and interlayer distance of Li. In this study, different conditions of the co-precipitation method for the synthesis of precursor and eventually LiNi_0.8Co_0.15Al_0.05O₂ material, as well as some parameters that indicate the ease of Li diffusion, were investigated. Analytical techniques such as TGA, XRD, SEM, and EDS were used to characterize the samples. Structural analysis was done by Rietveld refinement using FullProf. Crystallite sizes were determined using both the Rietveld refinement and the Williamson-Hall methods. NaOH molarity of 1 M, NH₃ molarity of 2 M, pH = 12 and T = 60 °C were determined as the optimum condition for the synthesis of the LiNi_0.8Co_0.15Al_0.05O₂ precursor. Besides, the feeding rate, molarity, and the addition sequence of solutions were investigated to reach a material with low cation mixing, high interlayer distance, and small crystallite size which lead to faster Li-ion diffusion.

锂离子扩散在锂离子电池中非常重要。合成方法是影响锂晶体结构和层间距的重要因素。在这项研究中，研究了共沉淀法合成前驱体和最终合成 LiNi _0.8 Co _0.15 Al _0.05 O ₂材料的不同条件，以及一些表明 Li 扩散容易程度的参数。采用 TGA、XRD、SEM 和 EDS 等分析技术对样品进行表征。Rietveld 使用 FullProf 进行结构分析。使用 Rietveld 细化和 Williamson-Hall 方法确定微晶尺寸。NaOH 摩尔浓度为 1 M, NH ₃摩尔浓度为 2 M、pH = 12 和T  = 60 °C 被确定为合成 LiNi _0.8 Co _0.15 Al _0.05 O ₂前体的最佳条件。此外，还研究了溶液的进料速率、摩尔浓度和添加顺序，以获得具有低阳离子混合、高层间距离和小晶粒尺寸的材料，从而导致更快的锂离子扩散。