THE COMPARISON OF ELECTROCHEMICAL IMPEDANCE BEHAVIORS OF LITHIUM-ION AND NICKEL-METAL HYDRIDE BATTERIES AT DIFFERENT STATE-OF-CHARGE CONDITIONS

Abstract

In this study, impedance responses of a lithium-ion battery and a nickel metal-hydride battery were analyzed as a function ofdifferent state of chargeconditions. The physical parameters of these widely used rechargeable batteries have been extracted through an equivalent circuit model by fitting impedance data. The fit was excellent. The regressed parameters explain the battery physics and dynamics well. Results show that the developed model could be utilized for the broadly used rechargeable batteries at their operational potentials. The electrochemical impedance spectroscopy is a beneficial technique to provide information regarding battery life, battery performance, and state of health of a battery.

Keywords

• li-ion battery
• ni-mh battery
• impedance spectroscopy
• state of charge
• equivalent circuit model