Abstract: An ionically conductive, ion-containing polymeric material prepared from an amorphous polymer and a source of ions and having a bulk ionic conductivity at 20.degree. C. and 10 kHz greater than 10.sup.-6 .OMEGA..sup.-1 cm.sup.-1, wherein the copolymer comprises a backbone from which depends at least one residue of the formula: ##STR1## wherein: n represent a number greater than 1; andR represents a hydrogen atom or substituted or unsubstituted lower alkyl group.

Abstract: A solid state electrochemical cell comprises an anode having at least one alkali metal as its active material, a cathode and an electrolyte comprising an anion and a cation comprising at least one electrolytically active alkali metal ion.The anion is at least partially immobilized by it constituting part of a polymer, chain, e.g. as the poly (methacryloyl-oxy-benzoate) or poly (2-(4-carboxyhexafluorobutanoyl-oxy-)ethylmethacrylate ions, thereby to overcome problems associated with mobile anions. The cation is preferably Li.sup.+ and a polymer such as poly (ethylene oxide) may be blended into the electrolyte to improve its mechanical properties.

Abstract: A solid state electrochemical cell comprises an anode having Li as its active material, a cathode and an electrolyte comprising a complex of a polyether with lithium.The polyether is atactic, has a low glass transition temperature and is capable of forming a complex with Li.sup.+ ions but not with Na.sup.+ ions. An example of such a polyether is polyvinyl methyl ether. The complex may be blended with another polymer such as a poly (ethylene oxide) - LiClO.sub.4 complex to improve mechanical properties for fabrication into the electrolyte.