Characterization of Sintered Lithium-Ion Battery Electrodes

Wednesday, 4 October 2017: 10:50
Chesapeake F (Gaylord National Resort and Convention Center)
P. Robinson and G. Koenig (University of Virginia)
Conventional lithium-ion batteries often have a low volume fraction of active material and a low electrode thickness in order to achieve high cycling rates and mechanical properties needed for electrode processing and cell assembly, but this limits the energy density that can be achieved at the cell level. Close-packed sintered electrodes are an alternative architecture that can achieve a high fraction of active material, but require careful design and understanding of the microstructure of the film. Sintered electrodes were fabricated using hydraulic pressing of active material powders into pellets, followed by sintering and assembly into cells. The performance of these electrodes has been tested through electrochemical cycling with promising initial results. The conductivities of the electrodes were examined and related to the battery polarization in coin cells. This study examines the relationship between electrode microstructure and electrochemical properties in sintered electrodes, while varying key parameters such as tortuosity, sintering conditions, thickness, active material chemistry, and particle size.