Meaning
Parameter used to quantify the internal equilibration of ion concentration across the active material layers. This dynamic redistribution index provides a mathematical representation of how lithium ions move from high-density regions to low-density regions after a pulse. It functions as a metric for evaluating the rate-handling capability of an electrode.
Characterising the speed of this internal movement is essential for modelling the thermal behaviour of the electrode under stress.
Ion Diffusion
Concentration gradients drive the flux of ions within the pore structure of the coating. The dynamic redistribution index measures the time required for the open circuit voltage to stabilize. Rapid equilibration suggests a highly porous and well-connected conductive network.
Recovery Phase
Voltage relaxation curves are analysed to extract the value of the index. During the rest period following a discharge, the dynamic redistribution index reveals the impact of particle size distribution on transport speed. Slower recovery often points to clogged pores or electrolyte depletion.
Operation Limit
Fast-charging protocols use this index to determine the safe ceiling for current intake. If the dynamic redistribution index indicates poor ion mobility, the charging speed must be reduced to avoid metallic lithium plating. This protection mechanism extends the safe operating window of the battery.
