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M. Fichtner
Associated Group Leader, Spokesman of the Cluster of Excellence POLiS
0721/608 25340 or 0731/50-34201 (HIU)
maximilian fichtnerObe2∂kit edu

KIT Campus North
Building 640


Energy Storage Systems

The energy storage systems group at the INT and the Materials-I group at HIU (leader: Maximilian Fichtner) consist of a multidisciplinary group of 25 researchers combining chemists and physicists, experimental and theoretical research
The group at the Conclave Meeting in Schöntal in July 2019.

An increasing fraction of renewable energies is expected to contribute to the global energy demand in the future and energy storage systems are needed for an efficient use of discontinuous sources such as wind and solar power. In this context, nanostructured architectures employing a 3-D structuring for power storage and conversion (batteries, supercapacitors, hydrogen storage materials, fuel cells, photovoltaics) provide many advantages over existing technologies to minimize power losses, improve charge/discharge rates, and enhance energy densities, because functional units in these architectures consist of interconnected ~10 nm domains and mesopores (10-50 nm), for example. In this regard, nanoscience and nanotechnology offer promising approaches as all the elementary steps of energy conversion (charge transfer, molecular rearrangement, chemical reactions, etc.) take place on the nanoscale.
For practical reasons, it is one of the favourable options to store energy in electrical and chemical storage devices such as batteries and supercapacitors.

The work on batteries focuses on the development of Novel Battery Chemistries involving new shuttle mechanisms based on singly charged negative ions such as F, Cl and the shuttle of Mg. Mg batteries are safe and can reach very high energy densities. The theoretical energy density of the Mg/S couple is 4000 Wh/L. In addition, nanostructured cathode materials are developed for Li ion batteries which are based on reactive nanocomposites. The aim is to develop materials with gravimetric energy storage capacities that are considerably above  those of current battery materials (i.e. approx. 250 Wh/kg). Targeted properties are the energy capacity, the power density, the cycling stability, and the sustainability of the materials.



New battery types

A recent paper on chloride ion batteries and new related cathode materials was highlighted in NATURE ENERGY.  (VOCl as Cathode for Rechargeable Chloride Ion Batteries; P. Gao et al., Angew. Chemie Int. Ed. 53 (2016) 4285-4290)

Small Ti clusters for catalysis of hydrogen exchange in NaAlH4
Paper awarded

Our paper "Small Ti clusters for catalysis of hydrogen exchange in NaAlH4" from 2003 in Nanotechnology has recently been awarded as one of the TOP 25 papers of the journal of the last 25 years.