Accession Number : ADA293924

Title :   Composite Polymer Electrolyte for Lithium Batteries.

Descriptive Note : Technical rept. Jul 94-Feb 95,

Corporate Author : ARMY RESEARCH LAB FORT MONMOUTH NJ

Personal Author(s) : Slane, Steve ; Salomon, Mark

PDF Url : ADA293924

Report Date : MAR 1995

Pagination or Media Count : 17

Abstract : Composite polymer electrolyte films consisting of zeolite powders dispersed in poly(acrylonitrile)(PAN) based gels with lithium hexafluoroarsenate have been prepared and their electrochemical properties studied. Gel electrolytes prepared by adding lithium hexafluoroarsenate in propylene carbonate (PC) and ethylene carbonate (EC) mixtures with PAN have demonstrated ionic conductivities greater than 0.001 siemens per cm at room temperature and above. The addition of zeolite powders increased ionic conductivity at low temperatures due to the highly amorphous nature of the composite film. Impedance spectroscopy was performed to study the lithium electrode/electrolyte interface, and a reduction of the passivation kinetics was observed. Cyclic voltammetry showed that addition of PAN and zeolite powder to liquid electrolyte mixtures with EC/PC did not change the stable electrochemical potential window. In Li/lithium cobalt dioxide cells, at 25 deg C, these composite electrolytes demonstrated current densities as high as 0.5 milliamps per sq cm, with little voltage or capacity loss compared to cells with liquid electrolytes. jg

Descriptors :   *POLYMERS, *COMPOSITE MATERIALS, *LITHIUM BATTERIES, *ELECTROLYTES, IONS, DENSITY, LOW TEMPERATURE, STABILITY, CAPACITY(QUANTITY), CONDUCTIVITY, SPECTROSCOPY, INTERFACES, LIQUIDS, CELLS, FILMS, ACRYLONITRILE POLYMERS, ELECTROCHEMISTRY, VOLTAGE, CURRENT DENSITY, CYCLES, ROOM TEMPERATURE, MIXTURES, PROPENES, POLYMERIC FILMS, WINDOWS, LOSSES, KINETICS, IMPEDANCE, VOLTAMMETRY, GELS, PASSIVITY, COBALT, FLUORINE COMPOUNDS, ETHYLENES, CARBONATES, DIOXIDES, ARSENATES.

Subject Categories : Electrochemical Energy Storage
      Inorganic Chemistry
      Polymer Chemistry
      Electrical and Electronic Equipment
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE