Accession Number:

ADA263728

Title:

Characterization of Lithium Electrode Surface in Lithium Secondary Batteries by In Situ Raman Spectroscopic Methods.

Descriptive Note:

Final rept. 1 Sep 89-31 Dec 92,

Corporate Author:

JACKSON STATE UNIV MS DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

1993-03-24

Pagination or Media Count:

23.0

Abstract:

Surface layers on lithium electrodes formed in several solvents including dimethyl carbonate DMC, diethyl carbonate DEC, polyethylene glycol 400 dimethyl ether PEG400DME, and propylene carbonate PC have been studied by Raman spectroscopy. Both DMC and DEC were used singly, and also mixed with either methyl acetate or methyl formate. The Raman spectra showed that passive films formed on the Li surface in different solvents may have different chemical structures, which changed during the charging and discharging processes. A solid film of fullerene C60, which could be used as a cathode in Li rechargeable batteries, was examined in the PEG400DME solution by both electrochemical and Raman spectroscopy. Cyclic voltammograms CVs showed five redox peaks which suggested the formation of C60-, C602-, C603-, C604-, and C605-. Raman spectra obtained from thin C60 film indicated that the thin fulleride film dissolved in the PEG400DMELiC104 solution at negative potentials.... Lithium electrode, Fullerenes, Electrochemistry, Raman spectroscopy.

Subject Categories:

  • Physical Chemistry
  • Atomic and Molecular Physics and Spectroscopy
  • Electrochemical Energy Storage

Distribution Statement:

APPROVED FOR PUBLIC RELEASE