Modelling Solvent Consumption from SEI Layer Growth in Lithium-Ion Batteries

Predicting lithium-ion battery (LIB) lifetime is one of the most important challenges holding back electrification vehicles, aviation, and grid. The continuous growth solid-electrolyte interface (SEI) widely accepted as dominant degradation mechanism for LIBs. SEI consumes cyclable lithium leads to capacity fade power via several pathways. However, also electrolyte solvent may lead dry-out, which has only been modelled in a few papers. These papers showed that dry-out induced positive feedback loop between loss active material (LAM) due increased interfacial current density, resulted drop. This work, however, shows negative LAM reduced concentration (in our case, EC), slows down growth. We show adding extra into LIBs at beginning life can greatly improve their service life. study provides new insights tool cell developers design longer lasting batteries.