Mathematical Model for SEI Growth under Open-Circuit Conditions
Shiv Krishna Madi Reddy, Wei Shang, Ralph E. White
Abstract
A solid electrolyte interphase (SEI) growth model is developed in a mixed mode that contains solvent diffusion through the SEI layer and corresponding solvent reduction kinetics at the SEI/electrode interface. The governing equations are solved by the Landau transformation, which makes the moving layer fixed to predict the open circuit potential, SEI layer thickness, and capacity loss. The estimated parameters fitted with experimental data from the literature are computed using COMSOL and MATLAB. Results show that the mixed mode model predicts lower capacity loss and thinner SEI layer due to its growth under open circuit conditions than previously reported by others.
Topics & Concepts
ElectrolyteDiffusionOpen-circuit voltageInterphaseMechanicsElectrodeThermodynamicsMaterials scienceEquivalent circuitCapacity lossLayer (electronics)SolventMATLABChemistryChemical engineeringComposite materialPhysicsComputer scienceVoltageElectrical engineeringEngineeringPhysical chemistryOrganic chemistryBiologyGeneticsOperating systemAdvanced Battery Technologies ResearchElectrowetting and Microfluidic TechnologiesIonic liquids properties and applications