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Towards State-of-Health Diagnosis and Prognosis of Li- and Na-ion cells: Incremental Capacity and Differential Voltage Analyses
Short Course at ECS meetings
In recent years, the number of studies dealing with the degradation of commercial cells has drastically increased. In many of these studies, the experimental design is extremely well planned but the presentation of the results often lacks the desired in-depth of understanding of the degradation modes behind the observed capacity fade and impedance changes.
The proposed short class will offer attendees a brief historical background on both techniques, a detailed overview of the principles and limitations of the both methods, the presentation of the impact of the major degradation modes, and the review of several case studies of a selection of conventional chemistries (e.g. graphite, Li4Ti5O12, LiCoO2, LiMn2O4, or LiFePO4).
The last part of the class will be interactive and feature live analysis using a Matlab®-based toolbox specifically designed to simplify the use of these techniques, help diagnose the state of health of Li-ion or Na-ion cells and identify and quantify the underlying degradation modes. Attendees will be able to download and retain a copy of this MatLab® toolbox for academic purposes. As a result, attendees will be able to adopt a pro-active attitude during a hands-on toolbox demonstration, as part of this short course.
About the Instructors
Matthieu Dubarry is an Assistant Researcher at the Hawaii Natural Energy Institute within the University of Hawaii at Manoa (USA). Trained as a ceramic engineer and material scientist at the French National School for Advanced Ceramics (MSc, 2001), Dr. Dubarry learned about lithium batteries during his PhD at the Nantes Institute for Materials under the supervision of Dominique Guyomard and Joel Gaubicher (PhD 2004). He joined HNEI in 2005 focusing, among other things, on the development of methodologies to facilitate the understanding of the degradation mechanisms of Lithium and Sodium ion batteries. In the late 2000s, Dr. Dubarry devoted most of his effort to develop the incremental capacity analysis on full cells. His work led to the development of the ‘alawa approach, a simple modeling approach oriented towards the understanding of single cell degradation. Dr. Dubarry is a well-recognized expert on the subject of electrochemical voltage spectroscopies and is regularly invited as a keynote lecturer to present his approach. He has published over 40 communications including several papers for the Electrochemical Society.
Arnaud Devie received his electrical engineering degree from INSA Lyon, France, with a major in semiconductor technology. He then worked toward a M.Sc. degree in electrical engineering while modeling and developing silicon carbide integrated circuits at Ampere Lab. Dr. Devie later joined the University of Lyon for a Ph.D. in electrical engineering in collaboration with the French Institute of Science and Technology for Transport, Development and Networks (IFSTTAR), where he undertook the characterization of lithium-ion batteries usage in EV and HEV applications. Dr. Devie joined the Hawaii Natural Energy Institute at the University of Hawaii at Manoa in 2013 to work on lithium-ion battery degradation diagnosis with Dr. Dubarry and Dr. Liaw. His current work focuses on cell design, diagnosis of abuse and consistency of degradation inside a batch of batteries.
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