Asymptotic Reduction of a Porous Electrode Model for Lithium-Ion Batteries (MOVED from 12/2 to 26/2)

Speaker: Dr. Iain Moyles (York)

Title: Asymptotic Reduction of a Porous Electrode Model for Lithium-Ion Batteries

Abstract:
Abstract: Lithium-ion batteries (LIBs) are ubiquitous in society ranging from uses in portable electronics to airplanes and are expected to power the technologies of the future. Theoretical studies of LIBs have used porous electrode theory to develop comprehensive models which, in principle, can guide the development of improved battery designs. However, battery optimisation is hindered by the staggering complexity of these models and the computational cost of simulating them. We present a volume averaged porous electrode model and show how a systematic approach based on matched asymptotic expansions can be used to greatly simplify the governing equations, permitting analytical solutions. The analysis shows that the charging/discharging process can be decomposed into three main regimes and elucidates the key physical mechanisms that control battery performance. We compare our asymptotically reduced model to both experimental data and results from full-scale simulations which demonstrate excellent agreement.