IMPEDANCE SPECTROSCOPY OF A PASSIVE LAYER ON LITHIUM

The impedance response of the lithium passive layer formed on lithium in SOCl2 was measured on two types of cells: a classical three-electrode cell and on a completely new one where the counterelectrode was blocking for charge carriers. Measurements at variable overvoltage and temperature allowed classification of the ares and spurs obtained in the complex plane of impedance response. Results confirm our previous suggestion that the most important arc (65,000-1 Hz) pertains to the Li/passive layer interface whereas the bulk response of the layer should appear at frequencies much higher than 65,000 Hz. At the end, several electrical parameters of the Li/passive layer system are given.