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Teilprojekte

Subproject 1: Low-dimensional lithium ion conductors

Bild zum Projekt Subproject 1: Low-dimensional lithium ion conductors

Leitung:

Heitjans, Wilkening, Lerch

Kurzbeschreibung:

The project is concerned with the study how Li diffusion is influenced by dimensionality effects. The investigations are to be performed on selected single-crystalline and polycrystalline materials which feature structurally confined diffusion pathways.

 

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Subproject 2: Diffusion pathways and activation energies in crystalline lithium ion conductors

Bild zum Projekt Subproject 2: Diffusion pathways and activation energies in crystalline lithium ion conductors

Leitung:

Lerch, Bredow

Kurzbeschreibung:

We intend to get information on the geometry of lithium ion migration and the energy barriers for selected lithium ion conductors, being in the focus of the research group, using experimental and theoretical methods.

 

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Subproject 3: Isotopic effects, jump correlation and diffusion paths in Li-containing oxide glasses

Bild zum Projekt Subproject 3: Isotopic effects, jump correlation and diffusion paths in Li-containing oxide glasses

Leitung:

Welsch, Behrens, Horn, Bredow

Kurzbeschreibung:

Systematic investigation of the chemical diffusion and self-diffusion of lithium in amorphous and crystal oxide phases. Li-migration mechanisms are insufficiently understood in oxide glasses and thus such materials stand in the core of this study. The comparison between single crystals and glasses, as well as other structural modifications yields insight into the impact of short- and long-range order on Lidiffusion. One of the principal goals of this project is to develop theories to predict the diffusion properties in function of the composition and the local structure of the materials.

 

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Subproject 4: Effect of pressure on transport properties of granular lithium ion conductors

Bild zum Projekt Subproject 4: Effect of pressure on transport properties of granular lithium ion conductors

Leitung:

Behrens, Lerch

Kurzbeschreibung:

A central issue is the synthesis of new amorphous Li-bearing solids and the investigation of the change in lithium mobility upon high pressure – high temperature treatment. A primary goal of the project is to determine experimentally the relationships between transport properties and the following parameters: composition and structure type, state of ordering, degree of compaction, local environment of lithium.

 

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Subproject 6: Kinetics of Li intercalation and de-intercalation in tantalum chalcogenide single crystals

Bild zum Projekt Subproject 6: Kinetics of Li intercalation and de-intercalation in tantalum chalcogenide single crystals

Leitung:

Horn, Behrens, Binnewies, Schmidt

Kurzbeschreibung:

The kinetics of lithium intercalation in layered materials is poorly understood and will be systematically investigated in TP6 using chalcogenides as examples. Several steps are involved in the intercalation process and it is not known a priori which of them controls the rate of intercalation.

 

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Subproject 7: Li-Diffusion in oxidie nanotubes as well as mesostructured layered materials

Bild zum Projekt Subproject 7: Li-Diffusion in oxidie nanotubes as well as mesostructured layered materials

Leitung:

Wark, Wilkening, Hanzu

Kurzbeschreibung:

Li diffusion and transport parameters, respectively, of nanostructured oxides such as TiO2 and SnO2 (ordered mesoporous materials, nanocrystallites of just a few nm diameter, nanosheets) are planned to be studied. The main goal of the project is to study the influence of the (surface) morphology, structural disorder and both the geometry and dimensionality on the Li mobility. For example, in nanotubes or nanosheets of TiO2 and SnO2 Li diffusion might be expected to be spatially confined. Thus, the ions have to use migration pathways of low dimensionality.

 

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Subproject 8: Ultraslow Li Transport on the nanometer scale

Bild zum Projekt Subproject 8: Ultraslow Li Transport on the nanometer scale

Leitung:

Schmidt, Heitjans

Kurzbeschreibung:

Investigation of slow Li diffusion in solids in their various structural modifications (single crystalline, nano-crystalline, amorphous).

 

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