A5042809441- Advanced Battery Technologies Research
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Radiation Effects in Electronics
- Electron and X-Ray Spectroscopy Techniques
- Physics and Engineering Research Articles
- Petri Nets in System Modeling
- VLSI and Analog Circuit Testing
- Flexible and Reconfigurable Manufacturing Systems
- Electric Vehicles and Infrastructure
- Supercapacitor Materials and Fabrication
- Advanced DC-DC Converters
Technical University of Munich
2018-2023
Whilst extensive research has been conducted on the effects of temperature in lithium-ion batteries, mechanical have not received as much attention despite their importance. In this work, stress response electrode particles is investigated through a pseudo-2D model with mechanically coupled diffusion physics. This can predict voltage, and thickness change for lithium cobalt oxide-graphite pouch cell agreeing well experimental results. Simulations show that level overestimated by up to 50%...
A physical-chemical model is suggested, which able to describe the enhanced discharge rate capability of lithium-ion cells by using laser-structured graphite anodes. Recently published test data coin comprising unstructured and structured anodes with LiNi1/3Co1/3Mn1/3O2 cathodes used for presented purpose modeling, simulation validation. To minimize computational demand, a homogenized three-dimensional representative hole structure developed, accounting charge mass transport throughout cell...
The energy density of lithium-ion batteries can be enhanced by using thicker and denser electrodes, which leads to transport limitations in the electrolyte within porous structures. A pore morphology modification electrodes counteract this limitation mechanism provide higher rate capabilities cells. In work, graphite anodes are structured with a picosecond laser order create pathways for lithium-ions allow penetration electrodes. Experimental data from graphite/NMC-111 coin cells varying...
A lithium- and manganese-rich layered transition metal oxide (LMR-NCM) cathode active material (CAM) is processed on a pilot production line assembled with graphite anodes to ≈7 Ah multilayer pouch cells. Each step outlined in detail compared NCA/graphite reference Using laboratory coin cell data for different CAM loadings porosities, simple calculation tool extrapolate optimize the energy density of cells presented validated. Scanning electron microscopy mercury porosimetry measurements...
A lithium- and manganese-rich layered transition metal oxide-based cathode active material (LMR-NCM) with a reversible capacity of 250 mAh g −1 vs graphite is compared to an established NCA/graphite combination in multilayer lithium-ion pouch cells 5.5 Ah at 1C discharge rate. The production the cells, electrode characterization as well formation described Part I this study. In II, two cell types are evaluated for their rate capability long-term stability. specific LMR-NCM ≈30% higher...
Lithium- and manganese-rich NCM (LMR-NCM) cathode active materials exhibit a pronounced energy inefficiency during charge discharge that results in strong heat generation operation. The implications of such are investigated for large-format lithium-ion batteries. Small laboratory cells generally considered isothermal, but larger cell formats this cannot be neglected. Therefore, the LMR-NCM/graphite coin NCA/graphite as reference is measured varying charge/discharge rates an isothermal flow...
State-of-the-art electric vehicles (EVs) rely on lithium-ion batteries with high energy densities, offering a sufficient driving range and thereby gaining the customer’s acceptance. In order to further increase density, current trend goes towards larger cell formats active materials incorporating higher specific capacities. Thicker denser electrodes also offer an opportunity required density independently of electrode’s composition, but face polarization issues if loads are applied. One...