Transport kinetics in battery electrodes

基于原位光学显微成像，将研究薄膜电池电极中的离子传输。第一个目标是测量体积扩散动力学的组成和温度依赖于两个氧化物具有高的潜在应用（Li4Ti5O12，LiMn2O4）。除了此基础量化的扩散系数和活化能的材料的体积特性，一个特别的重点是设置在运输通过和沿着内界面。应发现、证实和量化相间的潜在输运障碍或沿沿着短电路路径的快速输运。应借助蒙特-卡罗和动力学平均场模拟检查和解释界面传输系数对局部成分和温度的依赖性。应通过比较不同的多晶显微结构来确定和量化晶界的潜在影响。

Based on in-situ optical microscopic imaging, the ionic transport shall be investigated in thin film battery electrodes. The first goal is the measurement of volume diffusion kinetics in dependence on composition and temperature in two oxides with a high potential to application (Li4Ti5O12, LiMn2O4). Beside this base quantification of the diffusion coefficients and activation energies as volume properties of the materials, a particular focus is set on the transport through and along inner interfaces. Potential transport barriers at interphases or the fast transport along short cirucuit paths should be discovered, proven and and quantified. The dependence of interfacial transport coefficients on the local composition and temperature shall be checked and explained with the help of Monte-Carlo and kinetic mean field simulations. The potential effect of grain boundaries should be determined and quantified via the comparison of different polycrystalline microstructures.