Meaning
Granulometric median points represent the boundary where exactly half of the total volume of a powder sample consists of particles with a smaller diameter. The d50 parameter serves as the primary metric for grading cathode active materials during purchasing and quality control. This dimension directly influences both the packing density of the active material and the ionic transport rate within the electrode layer.
Battery powder sourcing relies on this value to ensure consistent electrochemical performance across different production lots.
Particle Size
Balanced distributions maintain a stable median size that fits the porosity requirements of the electrode layer. Deviations from the target median particle size alter the viscosity of the coating slurry.
Energy Density
High packing density is achieved when the median size allows smaller particles to fill the voids between larger ones. This arrangement maximizes the active material volume within the cell.
Sourcing Guide
Sourcing contracts define the acceptable range for this median diameter to guarantee assembly line compatibility. Material suppliers must verify this value using laser diffraction under standardized dispersion pressures.
