Materials, Slurries, and Coatings - Properties that Lead to Thick, High Energy Density Electrodes that Meet Power and Cycling Reps

Materials, Slurries, and Coatings - Properties that Lead to Thick, High Energy Density Electrodes that Meet Power and Cycling Reps

Abstract

Electrode fabrication consists of mixing materials to form a slurry, casting the slurry onto foil to form a coherent film, drying the film to form a laminate, punching the laminate into appropriately sized electrodes, and testing the electrodes in pouches or hardware.  We are interested in understanding how the materials work together to lead to highly functional battery electrodes.   The central problem is that everytime one changes the active material (the primary component) the conductivity, particle size, and shape also change.  This set of changes dictates the type and amount of carbon needed and the amount of binder needed.  The problem is that the solution is typically arrived at through a trial-and-error process. This can take several months for every new material being considered.  We are addressing this problem by trying to understand the relationship of material properties and mixing methods to slurry properties by characterizing the impact of each component separately and in pairs on the degree of mixing, the rheological properties, and surface tension.  We then investigate the effect these properties have on casting thickness and uniformity, degree of spreading, and whether cracks will be present in the dried laminate.  In this latest research, we show how and why high-loading electrodes of LFP can be produced if one starts with secondary particles of LFP.  We explain why it's so difficult to make thick electrodes with primary particles and the minimal amount of inactives that are needed to make a functional LFP electrode.  This research is broadly important to most cell fabrication teams testing new materials, and specifically important to companies intent on fabricating low-cost batteries of LFP.

Speaker

Vincent Battaglia

Vince Battaglia, Head of the Electrochemical Technologies Group, manages the Electrode Architecture research group at LBNL whose main emphasis is the development and testing of battery electrodes for EV, PHEV, and HEV applications.  This involves everything from developing electrode formulations with appropriate compromises in energy density and cycle life, to testing under vehicular conditions, to identifying failure modes, to predicting battery life.

Vince received his B.S. from the Johns Hopkins University in Baltimore, Maryland, and his Master’s degree in Chemical Engineering from the University of California at Berkeley.  He has been working in the field of batteries since obtaining his Ph.D. in Chemical Engineering, also from the University of California at Berkeley.  Upon graduating, his first professional position was with Argonne National Laboratory where he worked for 6 ½ years on two EV battery systems: LiAl/FeS2 and Li-polymer.  This was followed by 7 years on assignment with the DOE in Washington, D.C. where Vince served as Technical Coordinator of Research and Development for the Office of Advanced Transportation Technologies. Vince assists the Department of Energy (DOE) on the U.S. Advanced Battery Consortium Technical Advisory Committee in the development of battery test manuals.   He holds two patents and has written over 75 publications. 

Date/Time
Monday, April 22, 2024 - 03:00pm to 03:30pm
Type
Seminar