Our research features diffusion in elastically deformable solids with complex microstructure. A
prominent example are electrodes of Li-ion batteries which are typically a porous compound consisting
of a binder, conductive particles, and active particles, filled with an electrolyte. The charge and discharge
processes are complex multi-physics problems. Based on the used materials, they may include chemical
reactions, electrochemically driven diffusion, separation into lithium poor and lithium rich regions in
the active particles, or swelling phenomena [1]. Here, we consider a simplified version of this problem
restricting ourselves to diffusion in an elastic matrix-particle composite. In the matrix, the transport of
the mobile species is described using a Fickian-type flux driven by the gradient of the chemical potential.
In the particles, the mobile species tends to accumulate and build separate regions of equal concentration
– either high or low. This behavior is modeled using the Cahn-Hilliard equation.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:38373 |
| Date | 13 February 2020 |
| Creators | Kaessmair, Stefan, Steinmann, Paul |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/acceptedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 34, urn:nbn:de:bsz:15-qucosa2-378382, qucosa:37838 |
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