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Modelling electrode material utilization in the trench model 3D-microbattery by finite element analysis
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry.
2010 (English)In: Journal of Power Sources, ISSN 0378-7753, Vol. 195, no 18, 6218-6224 p.Article in journal (Refereed) Published
Abstract [en]

A mathematical model for ionic transport in 3D-microbattery (3D-MB) using finite element analysis is presented here, based on concentrated solution theory, ionic and atomic diffusion and the Butler-Volmer equation. The model is used to study electrochemical processes taking place in the electrodes and electrolyte of a 3D-MB in the trench architecture, with a 10 mu m thick electrolyte layer separating 10 mu m thick graphite anode and LiCoO2 cathode plates. The effect of changing conductivity of the positive electrode and the electrode plate height is also studied. Qualitative and quantitative data describing battery performance in terms of concentration gradient development and discharge curves points out the range for the most favourable electronic conductivity values of the electrodes: the values should not differ by more than order of magnitude. Furthermore, it is shown that also with optimal electrode conductivity values for electrodes, the Li ion diffusion in the electrodes during discharge is limiting the performance of the battery due to inhomogeneous lithiation and delithiation. Changing electrode height can be used to fine tune surface area usage, but has a limited effect on the overall battery performance.

Place, publisher, year, edition, pages
2010. Vol. 195, no 18, 6218-6224 p.
Keyword [en]
Microbattery, Finite element method, Electronic conductivity, Electrode design
National Category
Inorganic Chemistry
Research subject
Chemistry with specialization in Inorganic Chemistry
URN: urn:nbn:se:uu:diva-136874DOI: 10.1016/j.jpowsour.2010.02.056ISI: 000279203100068OAI: oai:DiVA.org:uu-136874DiVA: diva2:377871
Available from: 2010-12-15 Created: 2010-12-14 Last updated: 2010-12-27Bibliographically approved

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Brandell, Daniel
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