Examining multi-stage ageing mechanisms for lithium titanate oxide batteries
Lithium-titanate-oxide (LTO) batteries are one of the most promising technologies for various types of future applications in electric mobility, stationary storage systems and hybrid applications with high-power demands due to their long cyclic stability and superior safety. In our prior investigation we tested the cyclic and calendar ageing of 43 LTO cells under 16 different […]
On the inhomogeneous nature of Li-intercalation and Li-plating on graphite-based anodes – an experimental study by means of high-resolution light microscopy under inert gas atmosphere
Lithium-ion batteries (LIBs) currently represent the dominant technology in the field of rechargeable mobile and stationary energy systems. In order to ensure the longest possible life time, critical ageing mechanisms must be prevented. This includes, in particular, anode-side Li deposition (“Li plating”), which can lead to a rapid shortening of life time as well as […]
Optimal battery cells for grid-serving applications
In the context of the energy transition and the resulting expansion of renewable energies, the electrical grid is changing. As generator-based nuclear and coal-fired power plants will be switched off, inverter-based feed-in battery plants have to provide the ancillary services to stabilize the electrical grid in the future. Grid services are used to stabilize the […]
Thickness change and jelly-roll deformation and its impact on the aging and lifetime of commercial 18650 cylindrical li-ion cells with silicon containing anodes and NCA cathodes
In this work, different commercial available cylindrical cells in the format 18650 with each NCA cathode and anodes containing different silicon materials were electrochemically long-term cycled. Multiple Computed Tomography (CT) images were carried out after a settled number of completed cycles. Two voltage windows and their influence on the aging of the cells were investigated. […]
Optimal battery cells for grid-serving applications
In the context of the energy transition and the resulting expansion of renewable energies, the electrical grid is changing. As generator-based nuclear and coal-fired power plants will be switched off, inverter-based feed-in battery plants have to provide the ancillary services to stabilize the electrical grid in the future. Grid services are used to stabilize the […]
Recent development on materials, components, and processes for thiophosphate-based all-solid-state-batteries
All-solid-state lithium-ion batteries are promising candidates to overcome safety and energy limitations of common lithium-ion batteries. Although excellent results have been reported for sulfide based electrolytes on a small scale, classical slurry-based lithium-ion processing fails to reproduce the same performance in a larger cell. In this lecture, scalable concepts for material and component development are […]
Effect of silicon fraction and polymer molecular structure on the electrochemical performance of high-capacity lithium-ion cells
Silicon – with its low operating potential and much higher theoretical capacity than graphite – is assumed to be the anode material of choice for next generation lithium-ion batteries. However, silicon undergoes huge volume changes during lithium intercalation, deteriorating the mechanical integrity of the electrode and resulting in a significant capacity loss during cell cycling. […]
A novel capacity management system for leveling cells in a lithium-ion battery pack
The number of lithium-ion batteries for stationary storage and electric vehicles has expanded rapidly worldwide in the last years. The high voltage required for most applications is realized by serial connection of a large number of single battery cells. These cells have inherently different characteristics like internal resistance, capacity or self-discharge rate which results in […]
TEESMAT – Open Innovation Test Bed
TEESMAT is a platform to characterize electrochemical energy storage material and devices: Li-ion, Na-ion and all-solid-state batteries, printed Zn/Li batteries, lead-acid, metal-air, redox flow batteries and super-capacitors or any other kind of electrochemical device. TEESMAT is a unique pool of characterization techniques, brought by 8+ service providers, to probe the behavior of all the components […]
Significance of Additive Selection for Effective SEI during Prelithiation and Its Influence on Long-term Cyclability
Pre-lithiation, a method of doping an active material with lithium prior to being assembled into a battery cell, has been regarded as one of the most prominent ways to compensate for the amount of active lithium loss during the initial few cycles. The precedent researches have successfully verified the effectiveness of prelithiation in diverse ways […]