Accession Number : ADA130879

Title :   Investigation of the Electrochemical Formation of Li-C Intercalation Compounds.

Descriptive Note : Final rept. FY82,

Corporate Author : NAVAL SURFACE WEAPONS CENTER SILVER SPRING MD

Personal Author(s) : Smith,Patricia H ; DeVries,Larry ; Shih,Jason N ; James,Stanley D ; Kilroy,William P

PDF Url : ADA130879

Report Date : May 1983

Pagination or Media Count : 28

Abstract : This investigation re-examines the possible undervoltage electrochemical formulation of Li-C intercalation compounds. The conditions simulated that of a cell which has failed due to depolarizer starvation. Carbon black cathodes were subjected to constant-current electrolysis in 1 M LiAsF solutions in propylene carbonate or 2-methyltetrahydrofuran. Cathode V-t curves displayed plateaus around + 1 V versus Li in which the cathode absorbed approximately 16 coulombs per sq cm before falling to 0.05 V where the runs were terminated. Aqueous extracts of the cathodes contained little or no hydroxide indicating the absence of Li-C compounds. However, the present work also showed that LiC6 rapidly reduces propylene carbonate to carbonate ion. Hence it remains possible that the undervoltage plateaus originated in the formation of intermediate Li-C compounds which rapidly reduce the solvent.

Descriptors :   *Formulations(Chemistry), *Electrochemistry, *Formulations, *Lithium compounds, *Carbon black, *Electric batteries, *Alkaline batteries, *Lithium, Carbonates, Cathodes, Depolarization, Ions, Propenes, Starvation

Subject Categories : Physical Chemistry
      Electrochemical Energy Storage

Distribution Statement : APPROVED FOR PUBLIC RELEASE