AN ELECTROCHEMICAL AND RAMAN SPECTROSCOPICAL STUDY OF GEL POLYMER ELECTROLYTES FOR LITHIUM BATTERIES

The characterisation of transport properties and molecular interaction s in two different gel-type polymer electrolytes are described and dis cussed. The gel electrolytes were based on poly(acrylonitrile) (PAN) a nd poly(methylmethacrylate (PMMA), respectively, the polymer hosts con taining an ethylene carbonate-propylene carbonate (EC-PC) solution of LiClO4. The two systems show comparable conductivities though large di fferences are developed in the interfacial resistance at the lithium m etal electrode. The molecular interactions were investigated using Ram an spectroscopy for different salt-solvent compositions. The spectrosc opic data are important for the clarification of difference in reactiv ity towards the lithium metal electrode, and, thus, for the applicabil ity of the two types of membranes in rechargeable lithium batteries.