A multi-scale model able to evaluate volume changes from atomic level of active material up to battery level of prismatic lithium iron phosphate-graphite batteries is presented in this work. The model goes through the scales according to the following steps: changes of lattice parameters as a function of lithium intercalation and consequent lattice volume deformation; active material particles deformation; electrode volume changes and porosity reduction; evaluation of the effects of the hard case on the overall battery thickness change through finite element modelling. From the experimental side, the thickness change of prismatic LFP-graphite batteries is measured during operation at different current rates with high-precision optical sensors and the statistical analysis of the results is carried out. Scanning electron microscope analyses are carried out on electrode samples for measuring model parameters and to give a visual proof of the existence of different scales in lithium ion batteries. Finally, the results of the multi-scale model are validated with the experiments.

Electrochemical-mechanical multi-scale model and validation with thickness change measurements in prismatic lithium-ion batteries / Clerici, Davide; Mocera, Francesco; Soma', Aurelio. - In: JOURNAL OF POWER SOURCES. - ISSN 0378-7753. - 542:(2022), p. 231735. [10.1016/j.jpowsour.2022.231735]

Electrochemical-mechanical multi-scale model and validation with thickness change measurements in prismatic lithium-ion batteries

Davide Clerici;Francesco Mocera;Aurelio Soma
2022

Abstract

A multi-scale model able to evaluate volume changes from atomic level of active material up to battery level of prismatic lithium iron phosphate-graphite batteries is presented in this work. The model goes through the scales according to the following steps: changes of lattice parameters as a function of lithium intercalation and consequent lattice volume deformation; active material particles deformation; electrode volume changes and porosity reduction; evaluation of the effects of the hard case on the overall battery thickness change through finite element modelling. From the experimental side, the thickness change of prismatic LFP-graphite batteries is measured during operation at different current rates with high-precision optical sensors and the statistical analysis of the results is carried out. Scanning electron microscope analyses are carried out on electrode samples for measuring model parameters and to give a visual proof of the existence of different scales in lithium ion batteries. Finally, the results of the multi-scale model are validated with the experiments.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2972337
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