Accession Number : ADA294856

Title :   Plasticizers for Solid Polymer Electrolytes.

Descriptive Note : Technical rept. May 93-May 94,

Corporate Author : ARMY RESEARCH LAB FORT MONMOUTH NJ

Personal Author(s) : Walker, Charles W., Jr. ; Salomon, Mark

PDF Url : ADA294856

Report Date : FEB 1995

Pagination or Media Count : 36

Abstract : The ionic conductivity of a solid polymer electrolyte based on a lithium salt dissolved in a poly(ethylene oxide) (PEO) host was significantly improved with the use of plasticizing agents and a lithium ion coordinating compound. Either a plasticizing salt, solvent or combinations of both were incorporated into freestanding solution-cast films of (PEO)x(LiCF3SO3). The greatest enhancement of conductivity was observed when the plasticizing salt (LiN(CF3SO2)2) and a plasticizing solvent (diethyl phthalate, dimethyl phthalate, or dimethylglycol phthalate) were combined, with most notable improvement occurring below the melting temperature of PEO (approx. 66 deg C). Addition of a low concentration of 6,6-dibenzyl-14-crown-4, a lithium ion coordinating compound, also improved ionic conductivity. Electrochemical stability was determined by cyclic voltammetry, showing that plasticizers were generally stable between 4.3 V and 1.5 V versus lithium. jg

Descriptors :   *POLYMERS, *LITHIUM BATTERIES, *PLASTICIZERS, *SOLID ELECTROLYTES, IONS, STABILITY, OPTIMIZATION, CONDUCTIVITY, METHYL RADICALS, ELECTROCHEMISTRY, CYCLES, ETHERS, SALTS, VOLTAMMETRY, PHTHALATES, MELTING POINT, ETHYL RADICALS, POLYETHYLENE, GLYCOLS, ETHYLENE OXIDE.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Physical Chemistry
      Plastics
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE