Influence of position and intensity of production-caused inhomogeneities on the spatially-resolved performance parameters and total performance of lithium-ion cells

降低锂离子电池(LIB)成本的一种方法是通过创新的处理工艺来增加生产的产量。组件和电极之间不可避免的相互作用在电极中产生不均匀的电流密度分布，从而影响LiB的性能。除了已经调查过的缺陷外，人们对处理电极时与生产相关的负载的影响知之甚少。特别是在设计创新生产线时，弄清不同程度和不同位置的不均匀对LIB性能的影响是很重要的。本项目的目的是研究电极上的不均匀(缺陷和负载)对LIB性能的(位置)影响。它可以分为两个目标。第一个目的是通过一个实验支持的等效电路模型(ESBM)来确定不均匀性对LiB性能的影响，以便首次比较不均匀性的影响。第二个目标也是确定职位的影响。为此，开发了一种用于空间分辨表征的ESBM(OESBM)，并在创新的空间分辨表征测试单元的帮助下将其参数化。对于这两个目标，分别检查了缺陷、颗粒污染、水分和针孔以及机械载荷的压缩、拉伸和弯曲。老化机制SEI生长和锂电镀被迫通过日历和测试电池的循环老化。性能分析的重点是库仑效率、阻抗和电容。这两个目标的结果最终都被连接到一个应用软件中，以实现老化预测。这使得甚至在实施之前就能够对生产中的处理过程进行评估。

One way to reduce the cost of lithium-ion batteries (LIB) is to increase the throughput of the production through innovative handling processes. The unavoidable interaction between assemblies and electrodes creates uneven current density distributions in the electrodes and thus influences the performance of the LIB. In addition to defects that have already been investigated, little is known about the effects of production-related loads when handling the electrodes. Especially when designing innovative production lines, it is therefore important to clarify what influence various intensities and positions of inhomogeneities have on the performance of the LIB.The aim of this project is to investigate the (positional) influence of inhomogeneities (defects and loads) on electrodes on the LIB performance. It can be split up into two aims. The first aim is to identify the influence of inhomogeneities on LIB performance with the help of an experimentally supported equivalent circuit model (ESBM) in order to compare the influences of the inhomogeneities for the first time. The second aim is to also determine the influence of the position. For this purpose, an ESBM for spatially resolved characterization (oESBM) is developed and parameterized with the help of an innovative test cell for spatially resolved characterization. For both aims, the defects particle contamination, moisture and pinholes and the mechanical loads compression, tension and bending are examined. The aging mechanisms SEI growth and lithium plating are then forced through calendar and cyclical aging with test cells. The performance analysis focuses on Coulomb's efficiency, impedance and capacitance. The results of both aims are finally linked into an application software to enable an ageing prediction. This enables the evaluation of handling processes in production even before they are implemented.