A Closed-Form Impedance Model for Rechargeable Lithium-Metal Batteries

Abstract

Rechargeable lithium-metal batteries (LMBs) are viewed as the next important leap forward in lithium battery technology. Providing higher energy density than state-of-the-art lithium-ion batteries, LMBs have been largely held back by safety concerns and insufficient cycle life. Recent advances have made lithium metal viable for commercial production, though mathematical models of this chemistry have been slow to appear. This work introduces a closed-form impedance model for lithium metal chemistry and points the way toward reduced complexity model forms amenable to battery management system (BMS) applications.