IMPEDANCE OF LI-SN, LI-CD AND LI-SN-CD ALLOYS IN PROPYLENE CARBONATE SOLUTION

Electric properties of passivating films forming on the surface of Li- Sn, Li-Cd and Li-Sn-Cd alloy electrodes in propylene carbonate-based s olutions have been investigated using the electrode impedance spectros copy technique. Within the range of high and medium frequencies, the i mpedance spectrum has been shown to be described by the equivalent cir cuit represented by geometric capacitance and ionic resistance of the film, as well as capacitance of ionic space charge in the film and War burg impedance assigned to lithium cation diffusion. The change of imp edance spectra in the course of the electrode storage in the solutions has been discussed. Copyright (C) 1996 Elsevier Science Ltd