Date of download: 11/1/2017 Copyright © ASME. All rights reserved. From: Lithium-Ion Battery State of Charge and Critical Surface Charge Estimation Using an Electrochemical Model-Based Extended Kalman Filter J. Dyn. Sys., Meas., Control. 2010;132(6):061302-061302-11. doi:10.1115/1.4002475 Figure Legend: Numerical solution during discharge referring to a battery current I=30 A after 2 s (i.e., after 4 s of the FreedomCAR test). The solid concentration critical point for electrodes depletion/saturation is highlighted with a circle.