BMBF-Projects

Analysis of the hysteresis and aging of active material via calorimetry and dilatometry (HysKaDi)

Project description:

As part of the BMBF Competence Cluster Analysis and Quality Assurance (AQua), the HysKaDi project deals with the analysis of hysteresis and aging of active materials using calorimetry and dilatometry methods. Next-generation active materials such as silicon (Si) and Li and Mn-rich NCMs (LMR-NCM) show considerable hysteresis in the resting potential during (de) lithiation. The hysteresis not only results in reduced efficiency due to the voltage difference, but also leads to a higher heat load due to the losses. In addition to hysteresis, silicon-based anode materials exhibit significant volume expansion during charging, which leads to mechanical stress on the particles and thus on the electrode structure. Both effects are investigated in the project by means of calorimetry to determine the generated heat and by means of dilatometry to determine the volume expansion. A deeper understanding of the active materials of the next generation of lithium-ion batteries is aimed at through the correlation of the heat generation, the dilation behavior as well as the open-circuit voltage curve and the hysteresis.

Project duration: 11/2020 until 10/2023

Project partner:

• Center for Solar Energy and Hydrogen Research Baden-Württemberg (ZSW), Ulm
  Accumulators Materials Research (ZSW-ECM)
  Dr. Margret Wohlfahrt-Mehrens

• Technical University of Munich
  Chair of Technical Electrochemistry (TUM-TEC)
  Prof. Dr. Hubert Gasteiger

• Technical University of Munich
  Chair of Electrical Energy Storage Technology (TUM-EES)
  Prof. Dr.-Ing. Andreas Jossen

• University of Bayreuth
  Chair of Electrical Energy Systems (UBT-EES)
  Prof. Dr.-Ing. Michael Danzer

Contact person: Prof. Dr.-Ing. Michael Danzer, Leonard Jahn

Sponsorship: Federal Ministry of Education and Research (BMBF)

Website: BMBF Batterieforschung in Deutschland

Development of design guidelines for the recycling-friendly construction of battery systems

Project description:

Current lithium-ion battery systems are optimized with regard to performance, energy density and costs. Aspects of a circular or recycling-friendly design of cells, modules and systems, in particular with regard to a function-preserving remanufacturing, have not been considered so far. In view of the rapidly increasing battery system-related material flows due to the application in the growing electromobility market, the project aims at the systemic analysis and derivation of design guidelines for recycling-friendly construction in order to enable closed, efficient battery system cycles with little loss of raw materials. 

Project duration: 12/2020 until 11/2023

Project partner:

• TU Braunschweig
  Institute for Construction Technology (IK)
  Prof. Thomas Vietor
  Institute of Machine Tools and Production Technology (IWF)
  Prof. Christoph Herrmann
  
  
• Fraunhofer IKTS Dresden
  Fraunhofer Institute for Ceramic Technologies and Systems IKTS (IKTS)
  Prof. Mareike Wolter
  
  
• University of Bayreuth
  Chair of Manufacturing and Remanufacturing Technology (LUP) - in charge
  Prof. Frank Döpper
  Chair of Electrical Energy Systems (EES)
  Prof. Michael Danzer

Contact person LUP - in charge: Dr. Bernd Rosemann, Jan Koller
Contact person EES: Prof. Dr.-Ing. Michael Danzer, Tom Rüther

Sponsorship: Federal Ministry of Education and Research (BMBF)

Website: BMBF Batterieforschung in Deutschland

Project description:

The focus is on increasing the productivity of cell production and on gaining more flexibilty within the process. Herein, the battery production process is investigated from an integrative perspective and its productivity and quality are to be optimised through the use of digital technologies such as artificial intelligence. The main focus is on innovative and agile plant technology, digitisation and artificial intelligence (AI) in production and virtual production systems. This is where Prof. Dr. Maximilian Röglinger, Chair of Information Systems & Value-Based Business Process Management and member of the Business Information Technology project group at Fraunhofer FIT, is concentrating his efforts.  Together with the Fraunhofer Institutes IGCV and ISC, as well as the TH Aschaffenburg University of Applied Sciences, he is working on the expansion of battery cell production to include AI-supported process monitoring based on a generic system architecture. The benefit for battery cell production is a lower rate of rejection, which reduces costs and increases the overall plant efficiency. The project also contributes to sustainability by increasing product quality and reducing resource consumption in the areas of energy and materials. This progress is indispensable on our way to a sustainably produced battery that is nevertheless competitive on the market.

Project duration: 10/2020 - 09/2013

Project partner:

• Fraunhofer Institute for Foundry, Composite and Processing Technology IGCV

• Fraunhofer Institute for Silicate Research ISC

• Technical University of Aschaffenburg, Faculty of Engineering, Laboratory for Simulation and Hybrid Modeling

• University of Bayreuth, Chair of Information Systems and Value-Based Process Management

Contact person: Prof. Dr. Maximilian Röglinger, Dominik Fischer, Christina Leinauer

Sponsorship: Federal Ministry of Education and Research (BMBF)

Determination of process-quality relationships of formation and the end-of-line test for function-integrated overall process optimization (FormEL)

Project description:

The aim of the research project to determine process-quality relationships for cell formation and the end-of-line test for function-integrated overall process optimization (FormEL) is to optimize and merge the final processes in the production of lithium-ion battery cells. Conventional formations and end-of-line tests (EOL tests) take several hours to several days and are associated with considerable costs. In FormEL, cell formation and the EOL test are improved in terms of time, cost and quality. The aim of the project is to examine the influence of the formation procedure and the EOL test on the resulting and diagnosed cell quality. The determined process-quality relationships are used to develop detailed simulation models and to optimize the two process steps, with the aim of a function-integrated merger. The experimental tests and detailed simulation models enable systematic investigations to identify the key process parameters and optimize the overall process. This should lead both to an increased cell quality and to a reduced process time and thus to a reduction in costs.

Project duration: 08/2020 until 07/2023

Project partner:

• TU Braunschweig, elenia Institute for High Voltage Technology and Power Systems

• WWU Münster, Münster Electrochemical Energy Technology (MEET)

• RWTH Aachen, Production Engineering of E-Mobility Components (PEM)

• TU München, Institute for Electrical Energy Storage Technology (EES)

• University of Bayreuth, Institute of Electrical Energy Systems, Junior Professorship in Battery Management Methods

Contact person: Prof. Dr.-Ing. Fridolin Röder, Felix Schomburg

Sponsorship: Federal Ministry of Education and Research (BMBF)

Website: Kompetenzcluster zur Batteriezellproduktion – ProZell - FormEL

Powder Aerosol Deposition for the Fabrication of Batteries with graded Cathodes (FB2-AdBatt) 

Project description:

Due to their high gravimetric and volumetric energy density, all solid-state batteries (ASSB) with a metal lithium electrode and a solid ceramic electrolyte are considered the next step in battery technology. The FB2-AdBatt project aims to fabricate battery cells with continuously graded mixed cathodes by powder aerosol deposition (PAD). The battery design is characterized by electrochemical measurements and optimized based on models to maximize critical battery properties, such as current density and energy density. Further development of the PAD coating technology provides the basis for an economic evaluation regarding industrial implementation.

Project duration: 11/2021 until 10/2024

Project partner:

• University of Bayreuth, Chair of Functional Materials (FM) and Electrical Energy Systems (EES)
• University of Saarland, Group of Structured and Functional Ceramic
• Karlsruher Institute of Technology, IAM-MMI Mechanics of Materials 1

Contact person FM - federführend: Prof. Dr.-Ing. Ralf Moos

Contact person EES: Prof. Dr.-Ing. Michael Danzer