Mehrziel-Topologieoptimierung von Silizium-Anoden in Lithium-Akkumulatoren
Zusammenfassung der Projektergebnisse
With the raising demand for portable consumer electronics and electrically driven vehicles comes an increased need for onboard energy storage, and lithium batteries are becoming the storage method of choice. In order to deploy high capacity silicon as a new anode material, the anode structure must adequately accommodate the large volume expansion upon lithiation. The design must also maximize electrical conduction through the structure to ensure good rate capability of the battery and it has to meet the life expectation requirements of a long time use. This requires an optimized anode design. Within this work we developed an optimization tools for the design of typical silicon anodes. To utilize silicon as an anode material, the large volume expansion upon lithiation requires to extend the conventional topology optimization formulations to full finite kinematics. A strategy to do so has been elaborated. The demand for maximized electrical conduction through the structure is clearly competing with mechanical stability. This requires a careful study of the effect of large mechanical deformations and its interaction with the chemical field. Our contribution provides and discusses the chemo-thermo-mechanical backbone for the implementation of a corresponding numerical method. Exemplary simulations are also presented there. Another goal of this project was its extension to the batteries’ structural integrity and life expectation. Here we have studied different methods, but did not succeed to incorporate them in the topology optimization design tool.
Projektbezogene Publikationen (Auswahl)
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Towards structural optimization of lithium battery anodes. PAMM, 18(1).
Werner, Marek & Weinberg, Kerstin
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Coupled Thermal and Electrochemical Diffusion in Solid State Battery Systems. Advanced Structured Materials, 519-535. Springer International Publishing.
Werner, Marek & Weinberg, Kerstin
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Phase-field fracture simulations of the Brazilian splitting test. International Journal of Fracture, 220(1), 85-98.
Bilgen, Carola; Homberger, Stefanie & Weinberg, Kerstin
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Structural optimization of electrically charged anodes. PAMM, 19(1).
Homberger, Stefanie; Werner, Marek & Weinberg, Kerstin
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A multi-field model for charging and discharging of lithium-ion battery electrodes. Continuum Mechanics and Thermodynamics, 33(3), 661-685.
Werner, Marek; Pandolfi, Anna & Weinberg, Kerstin
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B-Spline meshing for high-order finite element analysis of multi-physics problems. Tech. Mech., Vol. 41, Is. 1, (2021)
M. Werner & K. Weinberg
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Invariance Aspects of F = FeFi Representations in Coupled-Field Problems. Advanced Structured Materials, 327-340. Springer International Publishing.
Werner, Marek & Weinberg, Kerstin
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Topology Optimization with Matlab: Geometrically Non-Linear Optimum Solid Structures at Random Force Strengths. Solids, 4(2), 94-115.
Werner, Marek; Bieler, Sören & Weinberg, Kerstin
