Distinguished Lectures at HZB: Prof. Jürgen Janek will give talk about the Materials Research for "Next Generation" Batteries
Prof. Dr. Jürgen Janek, Universität Gießen
The search for new and the development of improved electrochemical energy storage systems stimulates world-wide research efforts in both academia and industry. While impressive improvements and cost reductions are still to be expected for lithium ionbatteries (LIB) and are part of enormous industrial efforts, more fundamental research aims for the creation and understanding of completely new cell types.
In order to provide an up-to-date overview on recent developments, the current status of LIB will be briefly reviewed, before major trends in the study of new cell types will be discussed. Essentially, three types of potential "next generation"; batteries will be considered in more detail: (a) alkali metal/ sulfur batteries (e.g. Li/S8), (b) alkali metal/oxygen batteries (e. g. Li/O2) and (c) solid state batteries (SSB).
The lecture will focus on major materials challenges on the one hand and to mechanistic questions from the physicochemical point of view on the other hand. The lecture will help to better judge a dynamic research field by evaluating the true chances and risks of new cell types.
23.02.2015 16:00 o clock
Lecture Hall at Lise-Meitner-Campus, Hahn-Meitner-Platz 1, 14109 Berlin
Please note that for entering HZB premises a valid ID card/passport is required.
- Perovskites: the future of PV? - The smarter-E PodcastPerovskites: The Race for the Future of PV?
- Magnetic imaging: Micro-flowers increase the local magnetic fieldMaterials with magnetic nanostructures have many potential applications such as in spintronics. To explore such materials, nanoscale magnetic-sensitive imaging techniques are very useful, but up to now only weak magnetic fields could be applied during the imaging process. Now an international collaboration led by Dr. Sergio Valencia, HZB, has developed an approach that overcomes this limitation. The team designed tiny magnetic flux concentrators (MFCs), into which the sample is placed. The geometry of the MFCs resembles a flower with a number of petals which focus the applied magnetic field into its center. This greatly expands the magnetic field range available during imaging, and so the range of magnetic systems that can be investigated. The micro-flowers, enhancing magnetic fields locally, can find application in different nanometric magnetic microscopy techniques.
- CIGS-perovskite tandem cell achieves record efficiency of 25.5 %A Berlin-based team from HZB and Center for the Science of Materials Berlin (CSMB) at the Humboldt-Universität zu Berlin has set a new record for a tandem solar cell. Using a combination of a CIGS semiconductor layer and perovskite, along with several optimised intermediate layers, they were able to convert 25.5% of sunlight into electrical energy. The previous record for this combination of materials and this size of cell stood at 24.6%. The new record has been certified and is visible in the prestigious Solar Cell Efficiency Tables (the "Green Tables"), which serve as the definitive ledger for the global photovoltaic community.