03/24/2023
By Danielle Fretwell

The Francis College of Engineering, Department of Mechanical Engineering, invites you to attend a doctoral dissertation defense by Xiting Duan on “Parameters Identification and Degradation Diagnosis of Lithium-Ion Battery Using Impedance Spectra.”


Candidate Name: Xiting Duan
Degree: Doctoral
Defense Date: Friday, April 7, 2023
Time: 9 to 11 a.m.
Location: Perry 415

Committee:

  • Advisor Xinfang Jin, Assistant Professor, Mechanical Engineering, UMass Lowell
  • Fuqiang Liu, Associate Professor, Mechanical Engineering, UMass Lowell
  • Agar Ertan, Associate Professor, Mechanical Engineering, UMass Lowell
  • Kwok-Fan Chow, Associate Professor, Chemistry, UMass Lowell

Brief Abstract: Electrochemical Impedance Spectroscopy (EIS) is considered as a quick and nondestructive diagnostic tool to characterize the degradation of LIBs within a short testing timeframe. In my PhD research, an electrochemical characterization approach coupling EIS experiment data with a physics-based model (EIS-Physical) has been demonstrated to accurately identify key transport and kinetic parameters during a single charge/discharge cycle and aging tests. We find: (1) cathode Li-ion diffusivity and cathode/electrolyte exchange current density are quadratic functions of OCV in a charge/discharge cycle; (2) the cell capacity degradation is linearly related to the resistance caused by cathode/electrolyte interface reaction rate at specific OCVs and it could serve as the indicator of cell capacity fade; (3) surrogate modeling is a potential solution for quick and accurate battery diagnosis.

All interested students and faculty members are invited to attend the defense in-person.