ON THE SHORT-TIME BEHAVIOR OF POROUS INTERCALATION ELECTRODES

The reaction-rate distribution in a porous electrode containing an int ercalation compound is examined theoretically. Particular attention is paid to the influence of the exchange current density on the propagat ion of the reaction through the depth of the electrode at short times. The governing differential equations are nondimensionalized, lineariz ed, and applied to semi-infinite electrode and separator regions. A La place transform of the solution to this problem is presented, and asym ptotes are developed for-short and moderate times. These limiting form s are compared to the results of numerical simulations. The short-time reaction-rate distribution consistent with the assumption of an arbit rarily large exchange current density is presented and analyzed.