Composites & Hybrid Materials

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The scientific goal of the research group Composites / Hybrid Materials is the (further) development of innovative electrode materials for the next generation of batteries. It utilizes extremely different methods of preparation, such as solid-state reactions, sol-gel reactions, and hydrothermal reactions, to determine the most effective of theses method leading up to a highly pure final product. Furthermore, physical and structural characterizations are conducted to determine the influence that the morphology as well as the configuration of the atoms plays on the electrochemical properties.

Optimizing the materials for electrodes poses a great challenge to battery research. To do this, different methods of preparation—among other things—have to be developed. Many fundamental issues have to be resolved before high-purity products can be produced on a laboratory scale. The electrochemical properties of the materials are determined by their internal structure, down to the atomic level. Both the interface between the electrode and the electrolyte and its properties exert an influence on decomposition reactions, which greatly compromise a battery’s performance.

The research group Composites and Hybrid Materials is achieving a fundamental understanding of how electrode materials develop, in order to be able to decisively help develop the next-generation battery.

Dr. Margret Wohlfahrt-MehrensPrincipal Investigator (PI)Tel: +49 (0731) 9530 612Mail: margret.wohlfahrt-mehrens(at)zsw-bw.de
Research groupComposites & Hybrid Materials

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Various methods of preparation are employed, such as solid state, sol-gel, and hydrothermal reactions, in order to determine which of these methods is the most effective to ultimately obtain a high-purity end product. Furthermore, physical and structural characterizations are conducted to determine the influence of the morphology, the configuration of the atoms, on the electrochemical properties. The most important starting point for this is to understand the different factors exerting an influence—based on the various underlying syntheses—on the structure, the electrochemical properties and their electrode–electrolyte interface, the properties of the surface, and possible decomposition reactions.

 

For this purposes, very different methods of characterization are employed, such as X-ray diffraction (XRD), inductively coupled plasma emission spectrometry (ICP-OES), and scanning electron microscopy (SEM).

 

Another activity of this group is the development of innovative concepts for the optimized synthesis of carbon nanocomposites or conductive layers.

 

Multistep-Redox-Materials

The synthesis and characterization of so-called multistep redox materials such as lithium-metal silicates (Li2MeSiO4 ; Me=Fe, Mn, Fe/Mn)

Lithium-ion battery technology has found many applications, but it is limited by the insertion reaction that takes place with many materials and the associated transfer of at most one electron per ion of transition metal. This in turn ultimately limits the specific energy of the batteries. The reason for the interest in multistep redox materials results from the fact that these materials are capable of an insertion/extraction of more than one lithium ion per formula unit.

This concept has previously only been confirmed for two-dimensional nanostructures (i.e., ultrathin film) and is now to be transferred to three-dimensional ones. To reach this goal, various approaches have been developed, such as the use of a modified sol-gel or hydrothermal approach (with the addition of a surfactant) for the synthesis of high-purity Li2MexMe(1-x)SiO4/C composite materials (A and B).

 

In situ/ex situ carbon coating of lithium metal-silicate materials

A reduction in particle size and the addition of a nanolayer of carbon is indispensible for attaining good rate and cycle stability because of the low electronic and ionic conductivity of most of the innovative electrode materials. In order to create such a nanolayer of carbon on the materials, our group developed two different processes:

Regardless of the method, the addition of carbon reduces the material’s energy density. Effective routes for preventing this are being examined in order to design innovative structures that contain spherical, aggregated, or compact nanocrystallites. The precise role of carbon has, moreover, not yet been completely understood and is also being studied using various analytic techniques.

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Zeitschriftenaufsatz
Schüler Philipp, Sengupta Simon, Zaubitzer Steve, Fiesinger Florian, Dongmo Saustin, Görls Helmar, Wohlfahrt-Mehrens Margret, Borg Matthias, Gaissmaier Daniel, Krieck Sven, Marinaro Mario, Jacob Timo, Westerhausen Matthias
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Zeitschriftenaufsatz
Pfeiffer Lukas Fridolin, Jobst Nicola, Gauckler Cornelius, Lindén Mika, Marinaro Mario, Passerini Stefano, Wohlfahrt-Mehrens Margret, Axmann Peter
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Zeitschriftenaufsatz
Zaubitzer Steve, Dongmo Saustin, Schüler Philipp, Krieck Sven, Fiesinger Florian, Gaissmaier Daniel, van den Borg Matthias, Jacob Timo, Westerhausen Matthias, Wohlfahrt-Mehrens Margret, Marinaro Mario
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Zeitschriftenaufsatz
Binder Markus, Mandl Magdalena, Zaubitzer Steve, Wohlfahrt-Mehrens Margret, Passerini Stefano, Böse Olaf, Danzer Michael A., Marinaro Mario
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Zeitschriftenaufsatz
Kazzazi Arefeh, Bresser Dominic, Kuenzel Matthias, Hekmatfar Maral, Schnaidt Johannes, Jusys Zenonas, Diemant Thomas, Behm R. Jürgen, Copley Mark, Maranski Krzystof, Cookson James, Meatza Iratxe de, Axmann Peter, Wohlfahrt-Mehrens Margret, Passerini Stefano
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Zeitschriftenaufsatz
Hogrefe Christin, Hein Simon, Waldmann Thomas, Danner Timo, Richter Karsten, Latz Arnulf, Wohlfahrt-Mehrens Margret
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Zeitschriftenaufsatz
Kuenzel Matthias, Choi Hyeognseon, Wu Fanglin, Kazzazi Arefeh, Axmann Peter, Wohlfahrt-Mehrens Margret, Bresser Dominic, Passerini Stefano
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Zeitschriftenaufsatz
Kremer Lea Sophie, Hoffmann Alice, Danner Timo, Hein Simon, Prifling Benedikt, Westhoff Daniel, Dreer Christian, Latz Arnulf, Schmidt Volker, Wohlfahrt-Mehrens Margret
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Zeitschriftenaufsatz
Kuenzel Matthias, Porhiel Regis, Bresser Dominic, Asenbauer Jakob, Axmann Peter, Wohlfahrt-Mehrens Margret, Passerini Stefano
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Zeitschriftenaufsatz
Kuenzel Matthias, Bresser Dominic, Kim Guk-Tae, Axmann Peter, Wohlfahrt-Mehrens Margret, Passerini Stefano
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Zeitschriftenaufsatz
Marinaro M., Bresser D., Beyer E., Faguy P., Hosoi K., Li H., Sakovica J., Amine K., Wohlfahrt-Mehrens M., Passerini S.
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Zeitschriftenaufsatz
Hein Simon, Danner Timo, Westhoff Daniel, Prifling Benedikt, Scurtu Rares, Kremer Lea, Hoffmann Alice, Hilger André, Osenberg Markus, Manke Ingo, Wohlfahrt-Mehrens Margret, Schmidt Volker, Latz Arnulf
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Zeitschriftenaufsatz
Yoon Dong-Hwan, Marinaro Mario, Axmann Peter, Wohlfahrt-Mehrens Margret
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Zeitschriftenaufsatz
Armand M., Axmann P., Bresser Dominic, Copley M., Edström K., Ekberg C., Guyomard D., Lestriez B., Novák P., Petranikova M., Porcher W., Trabesinger S., Wohlfahrt-Mehrens Margret, Zhang H.
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Zeitschriftenaufsatz
Westhoff Daniel, Danner Timo, Hein Simon, Scurtu Rares, Kremer Lea, Hoffmann Alice, Hilger André, Manke Ingo, Wohlfahrt-Mehrens Margret, Latz Arnulf, Schmidt Volker
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Zeitschriftenaufsatz
Weinberger Manuel, Su Po-Hua, Peterlik Herwig, Lindén Mika, Wohlfahrt-Mehrens Margret
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Zeitschriftenaufsatz
Dou Xinwei, Buchholz Daniel, Weinberger Manuel, Diemant Thomas, Kaus Maximilian, Indris Sylvio, Behm Rolf J., Wohlfahrt-Mehrens Margret, Passerini Stefano
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Zeitschriftenaufsatz
Balasubramanian Prasanth, Mancini Marilena, Geßwein Holger, Geiger Dorin, Axmann Peter, Kaiser Ute, Wohlfahrt-Mehrens Margret
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Zeitschriftenaufsatz
Tahir Muhammad, Weinberger Manuel, Balasubramanian Prasanth, Diemant Thomas, Behm Rolf Jürgen, Lindén Mika, Wohlfahrt-Mehrens Margret
Learn more
Zeitschriftenaufsatz
Mancini Marco, Axmann P., Gabrielli G., Kinyanjui M., Kaiser U., Wohlfahrt-Mehrens M.
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Zeitschriftenaufsatz
Vieira Carvalho Diogo, Loeffler Nicholas, Kim Guk-Tae, Marinaro Mario, Wohlfahrt-Mehrens Margret, Passerini Stefano
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Zeitschriftenaufsatz
Varzi A., Raccichini R., Marinaro M., Wohlfahrt-Mehrens M., Passerini S.
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Zeitschriftenaufsatz
Marinaro M., Weinberger M., Wohlfahrt-Mehrens M.
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Zeitschriftenaufsatz
Weinberger Manuel, Wohlfahrt-Mehrens Margret
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Zeitschriftenaufsatz
Weinberger M., Pfeifer C., Schindler S., Diemant T., Behm R. J., Wohlfahrt-Mehrens M.
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Zeitschriftenaufsatz
Mancini Marco, Bekaert E., Diemant T., Marinaro M., De Biasi L., Behm R. J., Wohlfahrt-Mehrens M.
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Poster
Fleischmann S., Bekaert E., Emmel U., Wietelmann U., Wohlfahrt-Mehrens M.
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Poster
Bekaert E., Wohlfahrt-Mehrens M.
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Poster
Bekaert E., Wohlfahrt-Mehrens M.
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Poster
Bachtin K., Chen R., Indris S., Nikolowski K., Chakravadhanula V. S. K., Bekaert E., Wohlfahrt-Mehrens M., Roth C., Ehrenberg H.
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Poster
Scheuermann M., Wohlfahrt-Mehrens M., Hüsing N., Indris S.
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Members
Dr. Margret Wohlfahrt-MehrensPrincipal Investigator (PI)Tel: +49 (0731) 9530 612Mail: margret.wohlfahrt-mehrens(at)zsw-bw.de
Research groupComposites & Hybrid Materials
Research

(images will be uploaded shortly)

 

Various methods of preparation are employed, such as solid state, sol-gel, and hydrothermal reactions, in order to determine which of these methods is the most effective to ultimately obtain a high-purity end product. Furthermore, physical and structural characterizations are conducted to determine the influence of the morphology, the configuration of the atoms, on the electrochemical properties. The most important starting point for this is to understand the different factors exerting an influence—based on the various underlying syntheses—on the structure, the electrochemical properties and their electrode–electrolyte interface, the properties of the surface, and possible decomposition reactions.

 

For this purposes, very different methods of characterization are employed, such as X-ray diffraction (XRD), inductively coupled plasma emission spectrometry (ICP-OES), and scanning electron microscopy (SEM).

 

Another activity of this group is the development of innovative concepts for the optimized synthesis of carbon nanocomposites or conductive layers.

 

Multistep-Redox-Materials

The synthesis and characterization of so-called multistep redox materials such as lithium-metal silicates (Li2MeSiO4 ; Me=Fe, Mn, Fe/Mn)

Lithium-ion battery technology has found many applications, but it is limited by the insertion reaction that takes place with many materials and the associated transfer of at most one electron per ion of transition metal. This in turn ultimately limits the specific energy of the batteries. The reason for the interest in multistep redox materials results from the fact that these materials are capable of an insertion/extraction of more than one lithium ion per formula unit.

This concept has previously only been confirmed for two-dimensional nanostructures (i.e., ultrathin film) and is now to be transferred to three-dimensional ones. To reach this goal, various approaches have been developed, such as the use of a modified sol-gel or hydrothermal approach (with the addition of a surfactant) for the synthesis of high-purity Li2MexMe(1-x)SiO4/C composite materials (A and B).

 

In situ/ex situ carbon coating of lithium metal-silicate materials

A reduction in particle size and the addition of a nanolayer of carbon is indispensible for attaining good rate and cycle stability because of the low electronic and ionic conductivity of most of the innovative electrode materials. In order to create such a nanolayer of carbon on the materials, our group developed two different processes:

Regardless of the method, the addition of carbon reduces the material’s energy density. Effective routes for preventing this are being examined in order to design innovative structures that contain spherical, aggregated, or compact nanocrystallites. The precise role of carbon has, moreover, not yet been completely understood and is also being studied using various analytic techniques.

Equipment

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Collaboration

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Publications
Zeitschriftenaufsatz
Schüler Philipp, Sengupta Simon, Zaubitzer Steve, Fiesinger Florian, Dongmo Saustin, Görls Helmar, Wohlfahrt-Mehrens Margret, Borg Matthias, Gaissmaier Daniel, Krieck Sven, Marinaro Mario, Jacob Timo, Westerhausen Matthias
Learn more
Zeitschriftenaufsatz
Pfeiffer Lukas Fridolin, Jobst Nicola, Gauckler Cornelius, Lindén Mika, Marinaro Mario, Passerini Stefano, Wohlfahrt-Mehrens Margret, Axmann Peter
Learn more
Zeitschriftenaufsatz
Zaubitzer Steve, Dongmo Saustin, Schüler Philipp, Krieck Sven, Fiesinger Florian, Gaissmaier Daniel, van den Borg Matthias, Jacob Timo, Westerhausen Matthias, Wohlfahrt-Mehrens Margret, Marinaro Mario
Learn more
Zeitschriftenaufsatz
Binder Markus, Mandl Magdalena, Zaubitzer Steve, Wohlfahrt-Mehrens Margret, Passerini Stefano, Böse Olaf, Danzer Michael A., Marinaro Mario
Learn more
Zeitschriftenaufsatz
Kazzazi Arefeh, Bresser Dominic, Kuenzel Matthias, Hekmatfar Maral, Schnaidt Johannes, Jusys Zenonas, Diemant Thomas, Behm R. Jürgen, Copley Mark, Maranski Krzystof, Cookson James, Meatza Iratxe de, Axmann Peter, Wohlfahrt-Mehrens Margret, Passerini Stefano
Learn more
Zeitschriftenaufsatz
Hogrefe Christin, Hein Simon, Waldmann Thomas, Danner Timo, Richter Karsten, Latz Arnulf, Wohlfahrt-Mehrens Margret
Learn more
Zeitschriftenaufsatz
Kuenzel Matthias, Choi Hyeognseon, Wu Fanglin, Kazzazi Arefeh, Axmann Peter, Wohlfahrt-Mehrens Margret, Bresser Dominic, Passerini Stefano
Learn more
Zeitschriftenaufsatz
Kremer Lea Sophie, Hoffmann Alice, Danner Timo, Hein Simon, Prifling Benedikt, Westhoff Daniel, Dreer Christian, Latz Arnulf, Schmidt Volker, Wohlfahrt-Mehrens Margret
Learn more
Zeitschriftenaufsatz
Kuenzel Matthias, Porhiel Regis, Bresser Dominic, Asenbauer Jakob, Axmann Peter, Wohlfahrt-Mehrens Margret, Passerini Stefano
Learn more
Zeitschriftenaufsatz
Kuenzel Matthias, Bresser Dominic, Kim Guk-Tae, Axmann Peter, Wohlfahrt-Mehrens Margret, Passerini Stefano
Learn more
Zeitschriftenaufsatz
Marinaro M., Bresser D., Beyer E., Faguy P., Hosoi K., Li H., Sakovica J., Amine K., Wohlfahrt-Mehrens M., Passerini S.
Learn more
Zeitschriftenaufsatz
Hein Simon, Danner Timo, Westhoff Daniel, Prifling Benedikt, Scurtu Rares, Kremer Lea, Hoffmann Alice, Hilger André, Osenberg Markus, Manke Ingo, Wohlfahrt-Mehrens Margret, Schmidt Volker, Latz Arnulf
Learn more
Zeitschriftenaufsatz
Yoon Dong-Hwan, Marinaro Mario, Axmann Peter, Wohlfahrt-Mehrens Margret
Learn more
Zeitschriftenaufsatz
Armand M., Axmann P., Bresser Dominic, Copley M., Edström K., Ekberg C., Guyomard D., Lestriez B., Novák P., Petranikova M., Porcher W., Trabesinger S., Wohlfahrt-Mehrens Margret, Zhang H.
Learn more
Zeitschriftenaufsatz
Westhoff Daniel, Danner Timo, Hein Simon, Scurtu Rares, Kremer Lea, Hoffmann Alice, Hilger André, Manke Ingo, Wohlfahrt-Mehrens Margret, Latz Arnulf, Schmidt Volker
Learn more
Zeitschriftenaufsatz
Weinberger Manuel, Su Po-Hua, Peterlik Herwig, Lindén Mika, Wohlfahrt-Mehrens Margret
Learn more
Zeitschriftenaufsatz
Dou Xinwei, Buchholz Daniel, Weinberger Manuel, Diemant Thomas, Kaus Maximilian, Indris Sylvio, Behm Rolf J., Wohlfahrt-Mehrens Margret, Passerini Stefano
Learn more
Zeitschriftenaufsatz
Balasubramanian Prasanth, Mancini Marilena, Geßwein Holger, Geiger Dorin, Axmann Peter, Kaiser Ute, Wohlfahrt-Mehrens Margret
Learn more
Zeitschriftenaufsatz
Tahir Muhammad, Weinberger Manuel, Balasubramanian Prasanth, Diemant Thomas, Behm Rolf Jürgen, Lindén Mika, Wohlfahrt-Mehrens Margret
Learn more
Zeitschriftenaufsatz
Mancini Marco, Axmann P., Gabrielli G., Kinyanjui M., Kaiser U., Wohlfahrt-Mehrens M.
Learn more
Zeitschriftenaufsatz
Vieira Carvalho Diogo, Loeffler Nicholas, Kim Guk-Tae, Marinaro Mario, Wohlfahrt-Mehrens Margret, Passerini Stefano
Learn more
Zeitschriftenaufsatz
Varzi A., Raccichini R., Marinaro M., Wohlfahrt-Mehrens M., Passerini S.
Learn more
Zeitschriftenaufsatz
Marinaro M., Weinberger M., Wohlfahrt-Mehrens M.
Learn more
Zeitschriftenaufsatz
Weinberger Manuel, Wohlfahrt-Mehrens Margret
Learn more
Zeitschriftenaufsatz
Weinberger M., Pfeifer C., Schindler S., Diemant T., Behm R. J., Wohlfahrt-Mehrens M.
Learn more
Zeitschriftenaufsatz
Mancini Marco, Bekaert E., Diemant T., Marinaro M., De Biasi L., Behm R. J., Wohlfahrt-Mehrens M.
Learn more
Poster
Fleischmann S., Bekaert E., Emmel U., Wietelmann U., Wohlfahrt-Mehrens M.
Learn more
Poster
Bekaert E., Wohlfahrt-Mehrens M.
Learn more
Poster
Bekaert E., Wohlfahrt-Mehrens M.
Learn more
Poster
Bachtin K., Chen R., Indris S., Nikolowski K., Chakravadhanula V. S. K., Bekaert E., Wohlfahrt-Mehrens M., Roth C., Ehrenberg H.
Learn more
Poster
Scheuermann M., Wohlfahrt-Mehrens M., Hüsing N., Indris S.
Learn more

Group Facts