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.
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- BESSY II: How intrinsic oxygen shortens the lifespan of solid-state batteriesAlthough solid-state batteries (SSBs) demonstrate high performance and are intrinsically safe, their capacity currently declines rapidly. A team from the TU Wien, Humboldt-University Berlin and HZB has now analysed a TiS₂|Li₃YCl₆ solid-state half-cell in operando at BESSY II using a special sample environment that allows for non-destructive investigation under real operating conditions. Data obtained by combination of soft and hard X-ray photoelectron spectroscopy (XPS and HAXPES) revealed a new degradation mechanism that had not previously been identified in solid-state batteries. They have gained some surprising insights, particularly regarding the harmful role played by intrinsic oxygen. This study provides valuable information for improving design and handling of such batteries.
- Spintronics at BESSY II: Real-time analysis of magnetic bilayer systemsSpintronic devices enable data processing with significantly lower energy consumption. They are based on the interaction between ferromagnetic and antiferromagnetic layers. Now, a team from Freie Universität Berlin, HZB and Uppsala University has succeeded in tracking, for each layer separately, how the magnetic order changes after a short laser pulse has excited the system. They were also able to identify the main cause of the loss of antiferromagnetic order in the oxide layer: the excitation is transported from the hot electrons in the ferromagnetic metal to the spins in the antiferromagnet.