2, University of California, Riverside, Riverside, California, United States
3, University of California, Riverside, Riverside, California, United States
Electrochemical Impedance Spectroscopy (EIS) has been proved to be a very powerful technique to investigate the interfacial electrochemical dynamics within various kinds of electrochemical systems. However, using EIS to study the lithium-ion battery systems is not mature and reliable enough to analyze the State of Charge (SOC) and State of Health (SOH) of the batteries alone. Since EIS is a frequency related technique and the elements inside the battery system are also frequency related, by monitoring the internal temperature profile during the EIS period, more detailed and accurate analysis of the EIS results can be attained without adding any other time consuming and cycling techniques. In our study, temperature variation pattern has been found for different EIS tests during the whole aging process, and improvement for EIS analysis has been reached.