A study of the Li/Li+ couple in DMC and PC solvents - Part 2: Electrochemical studies of the Li/Li+ couple in LiAsF6/DMC and LiAsF6/PC solutions

Potential sweep and step experiments have been used to investigate the beha vior of the Li/Li+ couple in PC and DMC solutions with LiAsF6 salt. Lithium deposition and stripping are observed in a potential range that is affecte d by the nature of the solvent, the temperature and the scan rate of the po tential. Results show that the deposition current is limited by a mass-tran sfer process of lithium species in both carbonate electrolytes as already r eported in other organic electrolytes. The lithium diffusion coefficient is determined from voltammograms and its dependence with temperature is inves tigated. Data obtained from the potential step technique can be fitted acco rding to a 3D nucleation process only in PC solutions. (C) 1999 Elsevier Sc ience Ltd. All rights reserved.