Moderately Concentrated Acetonitrile-containing Electrolytes with High Ionic Conductivity for Durability-oriented Lithium-Ion Batteries
Until today, the use of acetonitrile (AN) based electrolytes in lithium-ion batteries could only be enabled by using superconcentrated electrolyte mixtures with a lithium salt concentration of over 2 mol L-1, due to the poor reductive stability of AN against graphite. [1] Here, the durability of electrolyte containing AN using low concentration of dual lithium […]
Effect of Doping on the Reuse of Recycled Positive Electrode Materials in Li-Ion Batteries
The demand for lithium-ion battery applications in both consumer electronics and electric vehicles is increasing rapidly. This will lead to resource shortages and increases in the prices of several critical metal elements, such as lithium and cobalt, vital for the electrode production. In addition to issues concerning the demands for new applications, the growing market […]
Control-Oriented Modeling of All-Solid-State Batteries
The emerging all-solid-state batteries (ASSBs) have attracted immense attention due to their superior thermal stability, increased power and energy densities, and prolonged cycle life. To achieve the expected high performance, practical applications of ASSBs require accurate and computationally efficient models for the design and implementation of many onboard management algorithms, so that the ASSB safety, […]
Lithium-Ion Battery Degradation: Measuring Rapid Loss of Active Silicon in Silicon-Graphite Composite Electrodes
Battery cell manufacturers strive to increase the energy density and specific energy of lithium-ion batteries to suit market needs. Using silicon in the negative electrode is one route towards this goal due to the high specific capacity of silicon (around 10 times higher than graphite). However, pure silicon degrades too quickly to be of use […]
Mechanical Structuring as Enabler for Increased Throughput in Lithium-Ion Cell Production
The reduction of manufacturing costs is a major task of battery production research and is inevitable for consumer acceptance of electromobility. One of the most prom-ising approaches for decreasing the costs is increasing the throughput by elevated coating thicknesses. However, thick electrodes suffer from a lack of performance due to the increased ionic resistance originating […]
Measuring inhomogeneous pressure distribution in lithium-ion pouch cells during long-term ageing
Several studies have shown that applying the right amount of mechanical pressure on lithium-ion batteries can reduce their aging drastically. In research, this pressure is usually applied using stiff plates that apply either a nearly constant force by using springs or a constant strain with fixed rods. In contrast, the industry uses cushioning pads in […]
Li+ concentration waves created in the electrolyte during operation of Li-ion batteries with porous graphite-based electrodes
In this presentation, Li+ concentration waves in the electrolyte of a C/Li cell during the galvanostatic operation are investigated with the help of the P2D model and experimental measurements with a four-electrode setup. The simulations reveal that Li+ concentration waves in the electrolyte are generated by the waves of reaction distribution inside the porous electrode. […]
Scanning Acoustic Microscopy of Side Reactions During Initial Cycles of Commercial Lithium-Ion Cells
In lithium-ion batteries, internal mechanical defects can be caused by a variety of production processes. Extensive research has shown that these defects are accompanied by a massive loss of capacity, are vastly limiting the fast charging capability, or can even lead to a safety-critical state. Therefore, it is of great interest to avoid unwanted artifacts […]
Effect of Doping on the Reuse of Recycled Positive Electrode Materials in Li-Ion Batteries
The demand for lithium-ion battery applications in both consumer electronics and electric vehicles is increasing rapidly. This will lead to resource shortages and increases in the prices of several critical metal elements, such as lithium and cobalt, vital for the electrode production. In addition to issues concerning the demands for new applications, the growing market […]
Revealing species distribution and morphology of SEI formation using kinetic Monte Carlo
Secondary lithium metal batteries are one of the promising technologies for future energy storage, even though the technology still faces issues regarding safety. One challenge is the generation of a stable and well performing Solid Electrolyte Interphase (SEI) which is a layer containing several species produced by (electro-)chemical reactions between lithium metal and electrolyte. The […]