ELECTRICAL AND ELECTROCHEMICAL CHARACTERIZATION OF (PEO)(N)M(SO3CL)(X) (M = LI, LIAL, CA) POLYMER ELECTROLYTES

Preparation of (PEO)(n)M(SO3Cl)(x) (M = Li, LiAl, Ca, x = 1, 2 and 4) polymer electrolytes is reported. Characterisation of the electrolytes concentrates on the electrical and electrochemical characteristics of the system. Variation of the polymer electrolyte conductivity with te mperature is correlated to the corresponding microstructural character istics (degree of crystallinity and glass transition temperature). Usi ng inert Au electrodes the transport numbers of the positive and negat ive charge carriers in the polymer electrolyte are determined. The ele ctrical properties of the passive film formed in contact with metallic lithium are studied using impedance spectroscopy. The impedance data is analysed using the well-known general solution for the impedance re sponse of the flat-band case of a system containing two types of mobil e charge carrier in the absence of a supporting electrolyte. (C) 1998 Elsevier Science Ltd. All rights reserved.