Accession Number : ADA301953

Title :   Improved Electrolytes for Lithium

Descriptive Note : Technical rept. Jun-Aug 95,

Corporate Author : ARMY RESEARCH LAB FORT MONMOUTH NJ

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

PDF Url : ADA301953

Report Date : NOV 1995

Pagination or Media Count : 22

Abstract : There has been a continuing effort to identify and develop chemistries that will satisfy the stringent MILSPEC requirements for a rechargeable lithium battery. Cell potentials exceeding 4.0 V present a difficult task to find electrolytes which are conductive and stable to oxidation at high potentials. In this study we selected four lithium salts and three solvents from which electrolytes were prepared and evaluated with respect to conductivity, electrochemical stability, and stability with aluminum (an issue because of its use as a current collector at the cathode). We have identified a conductive electrochemically stable electrolyte comprised of lithium tris-(trifluoromethanesulfonyl)method in a ternary solvent mixture of ethylene carbonate, dimethyl carbonate, and methyl formate as a viable candidate for a military electrolyte. We have also shown that a salt believed unstable with aluminum, lithium bis-(trifluoromethanesulfonyl)imide, is stable with aluminum, and is another candidate for a suitable electrolyte. jg p.3

Descriptors :   *LITHIUM BATTERIES, *ELECTROLYTES, STABILITY, CONDUCTIVITY, METHYL RADICALS, CELLS, ELECTROCHEMISTRY, MIXTURES, CATHODES, OXIDATION, ALUMINUM, FLUORINE, ORGANIC COMPOUNDS, STORAGE BATTERIES, SOLVENTS, METHANE, SALTS, TERNARY COMPOUNDS, LITHIUM COMPOUNDS, IMIDES, ETHYLENES, FORMATES, SULFONYL RADICALS, CARBONATES.

Subject Categories : Inorganic Chemistry
      Organic Chemistry
      Electrochemical Energy Storage
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE