Dense ceramic cathodes for lithium and sodium batteries
November 10-14, 2019
Electrodeposition of dense ceramic electrode materials has the potential to enhance secondary battery performance and mechanics, and broaden the scope of available electrode form factors. I will present our work on the electrodeposition of high performance LiCoO2, NaCoO2, LiMn2O4, and Al-doped LiCoO2-based Na and Li-ion cathodes as well as related materials. The electrolytically active materials were formed as solid films, with densities as high as 95%, and in thicknesses as great as 200 µm. The capacities are near-theoretical and the crystallinities and electrochemical capacities are comparable to powders synthesized at much higher temperatures. By using electrodeposition to grow the materials, the growth temperature was reduced from 700-1000 °C, the typical temperature for the solid-state synthesis of most cathode materials to 200-300 °C, which both enabled the direct growth of the nearly solid cathode on a metal current collector, and reduces the overall energy input required to grow the cathodes. We also find the electrodeposited films can be high textured, and in some cases, the crystals can be oriented such that the fast ion and electron diffusion pathways are normal to the substrate, which results in electrodes with unexpectedly good rate performances.
Please click Additional Files below to see the full abstract.
Paul Braun, "Dense ceramic cathodes for lithium and sodium batteries" in "Composites at Lake Louise 2019", John Kieffer, University of Michigan, USA Erik Spoeke, Sandia National Laboratories, USA Meisha Shofner, Georgia Institution of Technology, USA Eds, ECI Symposium Series, (2019). https://dc.engconfintl.org/composites_all_2019/60