Research projects

AktivCaps

Novel carbons for highly efficient dual-layer capacitors

Within the framework of the BMBF project AktivCaps, carbide-derived carbons (CDCs) for highly efficient double-layer capacitors (EDLCs) are being investigated. This project is characterized by the interplay between material development and simulation. The core was formed by, in addition to material synthesis and characterization, the development and adaption of simulation tools in order to make precise predictions on the material properties of highly porous activated carbons, and to thereby optimize the synthesis conditions.

The manufacture of the EDLC electrodes from the CDCs as well as the electrochemical tests took place at the Department of Electrical Energy Storage at the Fraunhofer IFAM, Oldenburg.

Partner

  • Scienomics GmbH, Neubiberg
  • Friedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Chemische Reaktionstechnik (CRT), Prof. Dr.-Ing. B. J.M. Etzold (jetzt TU Darmstadt)

Activated carbons increase energy density – Research initiative for energy storage from the federal government

AKUZIL

Development of materials and components for zinc-air secondary elements under consideration of system restrictions and system options

The aim of the BMBF project AKUZIL was the development of materials and components for rechargeable zinc-air batteries. In addition to the familiar aqueous alkaline electrolytes, electrolytes based on ionic liquids (ILs) were investigated and tested. The mechanisms of zinc deposition on the one hand and oxygen reduction and reoxidation in the ILs on the other hand formed the key focus points. The manufacture and characterization of optimized zinc electrodes and novel gas diffusion electrodes were other important components of the project. Superior system considerations and calculations rounded out the initiative.

The main focus point of the Fraunhofer IFAM lay in the development of catalysts, carbon carrier materials, and electrode designs for novel gas diffusion electrodes. Their interplay with ionic liquids formed the core of our research work.

Partner

  • TU Clausthal, Institut für Elektrochemie, Prof. Dr. F. Endres
  • TU Clausthal, Institut für Chemische Verfahrenstechnik, Prof. Dr.-Ing. U. Kunz
  • TU Clausthal, Institut für Elektrische Energietechnik und Energiesysteme, Prof. Dr. H. Wenzl
  • TU Braunschweig, Institut für Partikeltechnik, Prof. Dr.-Ing. A. Kwade
  • Carl-von-Ossietzky-Universität Oldenburg, Physikalische Chemie, Prof. Dr. G. Wittstock
  • Grillo Werke AG, Goslar
  • Varta Microbattery GmbH, Ellwangen
  • Solvay Fluor GmbH, Hannover
  • Volkswagen AG, Wolfsburg

 

Batt3D

High performance and solid-state batteries on the basis of three-dimensional current collectors

The aim of this research initiative is the development of a novel three-dimensional, foam-based electrolyte structure for application in lithium-ion batteries with liquid and solid electrolytes. Through the special design of these electrodes, the energy and performance density as well as the intrinsic safety can be significantly improved in comparison to conventional batteries.

The Fraunhofer IFAM is working on the application of functional films on three-dimensional substrates: electrode/solid-state electrolyte, as well as with the development of cell concepts and their electrochemical characterization.

Partner

  • Alantum Europe GmbH
  • VARTA Microbattery GmbH
  • Jahnke GmbH
  • SEMA Gesellschaft für Innovationen mbH
  • Fraunhofer IAP
  • Hochschule Osnabrück
  • Smart Battery Solutions GmbH
  • enfas GmbH

MASAK

Magnesium sulfide battery for electrical energy storage

Within the framework of the BMBF project MASAK, a new storage concept based on magnesium and copper sulfide was investigated. Analogous to the lithium-sulfur battery, the sulfide ions here perform the ionic charge transport inside the cells. The aim was to test this so far unique system in the sense of a proof of concept. Processes for the manufacture of Cu/CuS and Mg/MgS electrodes were developed and optimized and the electrodes were comprehensively characterized. The search for a suitable electrolyte was a further essential focus point of the project. The electrolyte synthesis on the base of ionic liquids was supported and complemented by molecular dynamic simulations.

The sub-project of the Fraunhofer IFAM encompasses, among others, the physical-chemical characterization of the electrodes, the electrochemical analysis of potential electrolytes, and the construction and testing of the electrochemical cells.

Partner

  • Brandenburgische Kondensatoren GmbH
  • Universität Rostock, Physikalische und Theoretische Chemie, Prof. Dr. R. Ludwig

Publications on the topic of magnesium sulfide batteries – Fraunhofer Publica

Magnesium sulfide: An alternative to lithium – Research initiative for energy storage from the federal government

MeLuBatt

Fresh breeze for metal-air oxygen batteries, what can be learnt from lithium-ion batteries

In MeLuBatt two central solution approaches are being followed: On the one hand the sources of electrolyte decomposition in metal-air batteries is being investigated in order to develop solutions to this problem, using the example of lithium-ion batteries (LIB). On the other hand, it is being investigated whether the extremely reactive singlet oxygen causes the familiar degradation phenomena during the electrochemical formation of oxygen. The knowledge gained in the project will be used for electrolyte and anode stabilization, first in concentrated form for a number of metal-air batteries regarding their performance, and also in comparison to LIB. The MLB full-cells are matched to anode, electrolyte, and cathode.

The main focus point of the Fraunhofer IFAM lies in the development of an ideal gas diffusion electrode (cathode) for the various metal-air systems investigated in this project and to test these under operating conditions.

Partner

  • Justus Liebig Universität, Prof. Janek
  • Westfälische Wilhelms-Universität Münster, Prof. Winter
  • Technische Universität Braunschweig, Prof. Krewer
  • Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg, Dr. Marinaro
  • Forschungszentrum Jülich, Prof. Eichel
  • Universität Bonn, Prof. Baltruschat

PolyBatt

Intelligent polymer films with integrated light wave conductors for the improved monitoring of the condition of prismatic lithium-ion battery cells.

The aim of this research initiative is the development of a novel and cost-effective manufacturing process for the production of intelligent polymer foils in order to ensure meeting the increasing safety and quality demands placed on lithium-ion cells. These polymer foils can be applied onto conventional prismatic lithium-ion cells or used directly as sheath material, and thus serve to supplement conventional battery management systems for the continuous monitoring of the charge and health of cells. In this way, for example, the safety of cheaply produced prismatic cells can be significantly increased in a subsequent manufacturing process.

Partner

  • Fraunhofer HHI – Abteilung Faseroptische Sensorsysteme
  • Power Innovation Stromversorgungstechnik GmbH
  • Stöbich Technology GmbH

In situ equipment condition monitoring of lithium-ion-cells by novel fiber optic sensor systems