Investigation of phase formation and phase constitution in the systems Li-Mg-Al-O and Li-Al-Mn-O with special focus on spinel solid solutions

本项目的目标是详细研究Li-Mg-Al-O和Li-Al-Mn-O两个四元子系统中的相形成，这两个子系统是与锂离子电池回收相关的复合氧化物渣系（Li，Mg，Al，Si，Ca，Mn）-O的一部分。一个特别的重点将是尖晶石固溶体作为并发过程形成的LiAlO 2作为早期结晶。将使用薄膜材料库的组合沉积进行子系统的调查，伴随着成分和晶体学高通量表征以及矿物学调查和表征。在系统与锰的一个特别的重点将是形态（MnII - MnIV）的相反应的影响。材料库的退火将在相关温度下进行，以获得有关系统的相形成和动力学行为的信息。结果将是两个多元氧化物体系的存在图。这种方法的目的是指定凝固实验的“感兴趣的区域”。用PXRD和EPMA分析了Li、Mg、Al、Mn、O体系中所选凝固熔体的成分和形貌。样品中的锂含量将使用XPS和西姆斯进行分析，并对选定的样品进行原子探针断层扫描。这些结果与材料库相结合将用于矿物学表征，包括在微尺度（薄膜材料库）和宏观尺度（熔融实验）上的反应的比较，其中皮升打印实验作为中间步骤，以根据需要收集关于这些系统的动力学的额外信息。

The objective of this project is the detailed investigation of the phase formation in the two quaternary subsystems Li-Mg-Al-O and Li-Al-Mn-O, which are part of the complex oxide slag system (Li, Mg, Al, Si, Ca, Mn)-O, relevant for Li-ion battery recycling. A special focus will be on spinel solid solutions as concurring processes to the formation of LiAlO2 as early crystallization. The investigation of the subsystems will be conducted using combinatorial deposition of thin film materials libraries, accompanied by compositional and crystallographic high-throughput characterization as well as mineralogical investigation and characterization. In the system with Mn a special focus will be on the influence of the speciation (MnII – MnIV) on the phase reactions. Annealing of the materials libraries will be carried out at relevant temperatures to gain information about the phase formation and kinetic behavior of the systems. The result will be existence diagrams of the two multinary oxide systems. This approach aims on specifying “regions of interest” for solidification experiments. The compounds and the morphology of selected solidified melts in the system Li, Mg, Al, Mn, O will be analyzed with PXRD and EPMA. Li contents in the samples will be analyzed using XPS and SIMS and for selected samples with atom probe tomography,. These results in combination with the material libraries will be used for mineralogical characterization including a comparison of the reactions on the micro-scale (thin film material library) and the macro-scale (melt experiments) with pico-liter printing experiments as intermediate step on demand to gather additional information on the kinetics of these systems.