Interface investigation between sulfidic and oxidic electrolytes

Considering Li-ion solid-state batteries, the area of solid electrolytes can be divided into polymers, sulfidic and oxidic electrolytes. Each of the material classes and their representatives deal with individual advantages as well as drawbacks. Thiophosphates, such as Li7P3S11 (LPS), have high ionic conductivities of up to 10 mS/cm. LPS can be processed easily at room […]

Impact of microstructure variations on the effective thermal conductivity of porous electrodes and cell stacks

The performance and lifetime of Lithium-ion batteries (LIB) are strongly influenced by the temperature distribution within the cells, as electrochemical reactions, transport properties, and aging effects are temperature-dependent. An optimization of LIB systems therefore also requires a profound understanding of the thermal cell behavior as well as efficient tools to describe these phenomena. However, thermal […]

Anode size – just geometry?

Electric cars powered by batteries have become one way of reducing CO2 emissions in cities. However, to increase the acceptance of electric cars in society, the reliability and longevity of the battery must be guaranteed. To achieve these goals, the battery’s functioning must be fully understood. In this context, especially the accurate prediction of the […]

Anode size – just geometry?

Electric cars powered by batteries have become one way of reducing CO2 emissions in cities. However, to increase the acceptance of electric cars in society, the reliability and longevity of the battery must be guaranteed. To achieve these goals, the battery’s functioning must be fully understood. In this context, especially the accurate prediction of the […]

A novel liquid electrolyte for high voltage lithium batteries

A novel liquid inorganic electrolyte for lithium batteries – alternative approach for high voltage cells In the last decade, enormous breakthroughs were made in the Li-ion battery technology (LIBT) by which LIBT dominated in the rechargeable battery market. The approaches in enhancing the energy density push the batteries to their limits, that triggers the urgent […]

Production of silicon nanopowders for use in high-capacity lithium-ion batteries

Silicon is considered as one of the most promising next generation lithium-ion battery (LIB) anode material due to its exceptional gravimetric and volumetric capacities. Unfortunately, the lithiation of silicon comes with important swelling which causes mechanical stresses on the silicon particles in the anode. Upon charge-discharge cycles, these stresses induce cracking and a degradation of […]

Study of the expansion of Li-ion cells with Si-based anodes with a combined approach of measurements and finite-element simulations

Si-based anode materials show promising volumetric energy density but suffer from significantly increased expansion upon lithiation compared to conventional graphite. This expansion causes detrimental effects in the cell and drastically reduces the cell’s lifetime. One reason for these effects are large mechanical stresses within the cell stack as a consequence of repeated expansion and contraction. […]

Study of the expansion of Li-ion cells with Si-based anodes with a combined approach of measurements and finite-element simulations

Si-based anode materials show promising volumetric energy density but suffer from significantly increased expansion upon lithiation compared to conventional graphite. This expansion causes detrimental effects in the cell and drastically reduces the cell’s lifetime. One reason for these effects are high mechanical stresses within the cell stack as a consequence of repeated expansion and contraction. […]

Binderless Electrode Technology for High Energy Density Lithium-ion Batteries

Energy storage electrodes are often limited in their electrochemical stability and electrical performance by polymer binders used in the active material layer. Binders are also used to adhere the active material to the current collector. Binders are usually polymeric resins used in electrodes to mechanically hold active material powders together. Active materials may be graphite, […]