Date: November 08, 2019 ǀ 14:00-15:00
Location: Auditorium, TUM Institute for Advanced Study, Lichtenbergstrasse 2 a, 85748 Garching, Tel +49.89.289.10550
Organization: TUM-IAS and Rudolf Diesel Industry Fellow Dr. Filippo Maglia (BMW Group)
Admission is free. No registration required.
Title: Development of High-Capacity, Manganese-Rich, Lithium-Ion Cells.
Speaker: Dr. Jason R. Croy, Argonne National Laboratory, Electrochemical Energy Storage Department, Chemical Science and Engineering Division. (croy(at)anl.gov).
Dr. Croy received his Ph.D. in physics from the University of Central Florida where his work focused on the electronic, vibrational, and catalytic properties of mono- and bi-metallic nanoparticle systems. In 2010 Jason began his career in energy storage at Argonne National Laboratory outside of Chicago, IL. His work at Argonne focuses on the design, synthesis, and characterization of high-energy, lithium-ion electrode materials with an emphasis on manganese-rich cathodes. Highlights of Jason’s work include the International Battery Association’s 2016 Early Career Award, 12 patents/applications, and over 50 publications. Dr. Croy is currently the principle investigator of two Department of Energy programs related to lithium-ion cathode development and is leading the Department of Energy’s Deep-Dive consortium, “Realizing Next Generation Cathodes for Li-Ion Batteries”, consisting of five U.S. national laboratories.
Abstract: Recent trends in cathode research show a renewed interest in layered, Li(NiMnCo)O2 (NMC) materials. In particular, nickel-rich NMC compositions (e.g., NMC-811) are receiving considerable attention and are even finding their way into commercial products. Despite many years of research on these systems, Ni-rich NMC//graphite cells still undergo surface performance losses at untenable rates when cycled above ~4.2V and are less thermally stable than NMC predecessors (e.g., NMC-111). In addition, high demand, fluctuating prices, and scrutiny over the ethical and geopolitical implications related to cobalt mining has attracted interest in the possibility of competitive, cobalt-free oxides, and new concerns are now arising with respect to the future supply and demand of battery-grade Ni precursors. Therefore, enabling a broader portfolio of cathode materials may prove critical to the success of the EV market. Alternatively, high capacity materials do exist within the class of layered-layered, xLi2MnO3•(1-x)LiNMCO2 cathodes. However, these materials are still hindered by phenomena such as voltage fade, poor rate capability, and high impedance. In addition, charging voltages of ≥4.4V are typically necessary to take advantage of the available capacities and these cells would also be subject to surface degradation similar to the layered NMCs. This presentation will explore ongoing work at Argonne National Laboratory focused on the stabilization and development of alternatives in the form of y[xLi2MnO3•(1-x)LiMO2]•(1-y)Li1+zM2-zO4, layered-layered-spinel cathodes. By adopting a bottom-up approach whereby x is limited to <0.3 in layered-layered cathodes, and modifying local domains through the introduction of spinel and/or spinel-type defects, manganese-rich compositions can be realized that achieve ~200 mAh/g over extended cycles with good energy retention. Parallel efforts aimed at cathode surface stabilization will also be discussed.