Key Research Areas

Electrochemical micro-storage and harvesting

Energy autarkic microsystems and intelligent, self-sufficient sensor nodes will lead to completely new applications in the future. The power supply required for this must be an integral part of the early stages of development and requires the cooperation of developers, manufacturers and end users.

Energy autarkic microsystems and intelligent, self-sufficient sensor nodes will lead to completely new applications in the future. The energy supply required for this must be an integral part of the early phases of development and requires the cooperation of developers, manufacturers and end users. Micro-batteries and energy harvesting are keywords in this development. Fraunhofer IZM is working on a number of joint projects with partners from industry and other institutes in this field. In particular, the 3D silicon technologies of the WLSI department, but also innovative circuit board and packaging technologies, are used to miniaturise and integrate energy supply systems. In addition, the necessary equipment and facilities are available to supply, modify and test the electrochemically active materials. In addition to R&D services, testing of primary and secondary batteries, consultancy and testing services are offered.

Integrated micro batteries

© Fraunhofer IZM
SEM of coplanar battery. Graphite and lithium cobalt oxide electrodes on both sides of the separator
© Fraunhofer IZM
Prototypes of silicon integrated micro batteries
  • Development of electrode pastes and electrode fabrication technology suited for integrated lithium batteries
  • Anode and cathode material selection, investigation of nano tubes
  • Investigations on diffusion barrier and encapsulation materials for Lithium batteries. Increase of life time
  • Electrochemical simulation of rechargeable lithium batteries
  • Silicon patterning and 3D technology development for high power micro batteries

Micro fuel cells

© Fraunhofer IZM
Planar micro fuel cells
© Fraunhofer IZM
Micro fuel cell stacks, power 2 – 20 Watts
  • Electrochemical corrosion prevention – life time increase for low cost micro fuel cells
  • Design optimization of micro fuel cells based on simulation, area resolved measurement and rapid prototyping
  • Materials characterization for fuel cells (catalysts, membranes, gas diffusion layers, current collectors, micro channel plates)
  • Control algorithms for micro fuel cells

Hydrogen generators for micro fuel cells

© Fraunhofer IZM
Hydrogen evolving cells 2x180 Ah
Hydrogen evolving
© Fraunhofer IZM
Hydrogen evolving cells 6x70 Ah
  • Investigation of anode materials (grain size, grain shape, alloys and additives)
  • Investigation of electrolytes for galvanic hydrogen generators
  • Cell design and development
  • KOH stable sealing methods
  • Long term stability of hydrogen generators
  • Control algorithms for combined hydrogen generator and fuel cell

Energy harvesting

Ski helmet
© Fraunhofer IZM
Ski helmet with 3D solar module, 1.6 W power
  • Materials research for capacitive Harvesters with flexible electrode and high-k dielectric
  • Design optimization of capacitive harvester
  • System optimization for capacitive harvester for several use cases
  • 3D Si-solar modules for portable application

Services relating to micro energy systems

 

Micro battery

Customized secondary micro batteries / Materials development and testing for lithium batteries / Battery test service