In this article, we analyze the leaching kinetics with phosphoric acid of LiCoO₂ samples from spent Li-ion batteries and commercial LiCoO₂. The purpose was to study the mechanism by which the extraction reaction of cobalt and lithium is produced from the solid samples. The experimental results showed that raising the temperature and the reaction time contributed to improving both the extraction of Li and Co from the structure. The leaching rate of the metals from both samples in the phosphoric acid solution could be expressed as:$\text{ln}\left(1-\text{X}\right)=-{\text{b}}_1\left[\text{ln}\left(1+{\text{b}}_2\text{t}\right)-\frac{{\text{b}}_2\text{t}}{1+{\text{b}}_2\text{t}}\right]$. The morphology of the solid revealed that the dissolution reaction of the samples develops from preferential growth of active sites, points susceptible to chemical interaction, occurring in one direction, giving rise to the start and progress of the reaction. The generation of these sites in the LCO-H₃PO₄ reaction system is of the "sequential" type. The apparent activation energy values for the leaching of Co and Li would indicate that the surface chemical reaction is the rate-controlling step during this dissolution process.

在本文中，我们分析了废锂离子电池和商用LiCoO ₂中LiCoO ₂样品的磷酸浸出动力学。目的是研究从固体样品中产生钴和锂的萃取反应的机理。实验结果表明，提高温度和反应时间有助于改善结构中Li和Co的提取。两种样品在磷酸溶液中金属的浸出率可以表示为：$\text{ln}\left(\mathrm{1个}--\text{X}\right)=--{\text{b}}_{\mathrm{1个}}\left[\text{ln}\left(\mathrm{1个}+{\text{b}}_2\text{Ť}\right)--\frac{{\text{b}}_2\text{Ť}}{\mathrm{1个}+{\text{b}}_2\text{Ť}}\right]$。固体的形态表明，样品的溶解反应是由活性位点的优先生长而产生的，活性位点是易于发生化学相互作用的点，在一个方向上发生，从而引发了反应的开始和进行。在LCO-H ₃ PO ₄反应系统中这些位点的产生是“顺序”类型的。Co和Li的浸出的表观活化能值表明表面化学反应是该溶解过程中的速率控制步骤。