Lithium ion conductivity in polyoxyethylene/polyethylenimine blends

• Published in: Electrochimica acta Vol. 46; no. 10; pp. 1709 - 1715
• Main Authors: Tanaka, R., Sakurai, M., Sekiguchi, H., Mori, H., Murayama, T., Ooyama, T.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 15-03-2001; Elsevier
• Subjects: Applied sciences; Electrical, magnetic and optical properties; Exact sciences and technology; Ion conductivity; Lithium ion conductor; Organic polymers; Physicochemistry of polymers; Poly(ethylene oxide); Polyethylenimine; Polymer electrolyte; Properties and characterization; Polymer electrolyte; Polyethylenimine; Poly(ethylene oxide); Ion conductivity; Lithium ion conductor; Ethylene oxide polymer; Polymer blends; Electrical properties; Property composition relationship; Lithium Perchlorates; Ionic conductivity; Polymer solid electrolyte; Experimental study; Activation energy; Polyethylene imine
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/S0013-4686(00)00775-1

In search of more viable solid polymer matrices for lithium ion conductors, solid solutions of LiClO
4 in polyoxyethylene/polyethylenimine (PEO/PEI) (8:2, 5:5, and 2:8 by repeat units) blends were examined.
In the 8:2 blends, conductivities increased with the decrease in the salt content. Conductivities in the 8:2- and the pure PEO systems were comparable at temperatures higher than 350 K. The drastic conductivity drop due to crystallization known for the PEO systems did not occur in the 8:2 systems; the 8:2 systems became ca. three orders of magnitude more conductive at room temperature. In contrast, the 5:5 systems suffered a severe conductivity drop near 330 K. The abrupt conductivity drop disappeared again in the 2:8 systems. They were more conductive than the pure PEI systems. Weak temperature dependence of conductivity made their room temperature condutivities even higher than those for the pure PEO systems.