CONICET | Buscador de Institutos y Recursos Humanos

Abstract: Performance of lithium ion batteries whose electrodes are composed ofparticles of different sizes is studied. Simplified model developed in 7 is extended andthe simulations are compared with experiments from the literature so as to validate thisnew model. The differences in current density observed in particles of different sizes,which are in contact, depend on particle size and state of charge. Internal particle toparticle discharge currents are observed during relaxation times. A parametric study ofthe applied current and particle sizes of electrodes is carried out to evaluate cellperformance, with emphasis on cell voltage and final capacity measurement. Theevolution of reaction rates on the surface of electrode particles and their correspondingstates of charge are depicted. An analysis of relaxation times in terms of cell voltage,current density, equilibrium potentials, and overpotentials is included.