The electrochemical performance of polymer‐based batteries can be improved by the addition of inorganic fillers to the polymer electrolyte, giving composite polymer electrolytes. The use of polymer nanocomposites, where the dimensions of the filler particles are reduced, should lead to the improvement of the performance of the electrolytes. Here, the direct intercalation of poly(ethylene oxide) into Na⊕ and Li⊕‐exchanged layered silicates and the properties of the resulting nanocomposites is reported.

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Ethylene oxide was copolymerized with propylene oxide, epichlorohydrin or styrene oxide at various monomer feed compositions, using partially hydrolyzed organoaluminium compounds as catalysts. The copolymers obtained after doping with NaI form highly conductive polymeric electrolytes. Complex impedance measurements show relaxation semicircles much less depressed than in semicrystalline electrolytes based on poly(ethy1ene oxide). The maximum values of the room temperature conductivity for each kind of copolymer containing electrolytes are higher than those for the pristine poly(ethy1ene oxide)-NaI system. The highest value, equal to 2.6 * S/cm at 25 "C, was found for poly(ethy1ene oxide-co-propylene oxide) containing 33 mol-Yo of propylene oxide monomeric units. ZUSAMMENFASSUNG:Ethylenoxid wurde mit Propylenoxid, Epichlorhydrin und Styroloxid bei verschiedenen Comonomerzusammensetzungen unter Verwendung partiell hydrolysierter Organoaluminiumverbindungen copolymerisiert. Die so erhaltenen Copolymeren zeigten nach der Dotierung mit NaI eine hohe elektrische Leitfahigkeit. Impedanzmessungen dieser dotierten Copolymeren zeigten eine weit geringere Dampfung der Relaxationshalbkreise als bei semikristallinen Leitern aus Poly(ethy1enoxid). Die maximale Leitfahigkeit der dotierten Copolymeren war bei Raumtemperatur in jedem Fall hoher als die des homopolymeren Poly(ethy1enoxid)-NaI-Systems. Der hochste Leitfahigkeitswert (2,6 * S/cm bei 25 "C) wurde bei einem Ethylenoxid-Propylenoxid-Copolymeren mit 33 mol-Yo Propylenoxid gemessen. 0 1991 Hiithig & Wepf Verlag, Base1 CCC 0003-3146/91/$03.00

The conducting properties of solid electrolytes comprising random poly(ethylene oxide‐co‐propylene oxide) (of 84 : 16 monomer units mole ratio) and lithium, sodium, potassium, cesium, and rubidium salts have been studied. The systems containing some lithium or sodium salts achieved conductivity levels as high as 10−5–10−4 S/cm at ambient temperature and greater than 10−3 S/cm at 100°C. However, the systems with rubidium and cesium salts exhibit conductivities a few orders of magnitude smaller. DSC studies show that the electrolytes studied are characterized by a high content of an amorphous phase (95–100%). It is suggested that the copolymer exhibits lower complexing abilities than that of poly(ethylene oxide), which results in a higher flexibility of electrolytes containing small cations and poor dissociation of the salts having large cations. © 1995 John Wiley & Sons, Inc.

Comblike polyelectrolytes comprising immobilized carboxylic anions and poly(oxyethylene) (OCH2CH2) n side chains of various length were obtained from the reaction of appropriate lithium alcoholates with maleic anhydride−styrene alternating copolymers. These materials may be fabricated as films of ambient temperature conductivity in the range of 10-9−10-6 S·cm-1, depending on the side-chain length. The conductivity values increase by 2−3 orders of magnitude after the addition of strong polar plasticizers such as dimethyl sulfoxide and propylene carbonate. A further increase in conductivity was observed after the complexation of carboxylic anions by BF3. On the basis of 13C NMR studies and 7Li NMR relaxation times of lithium carboxylates, it was found that the anion complexing agent reduces ion pairing in polyelectrolytes more effectively than cation-solvating solvents. The possible conduction mechanism in the solid and gel polyelectrolytes is discussed.