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 behavior 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 affected by the nature of the solvent, the temperature and the scan rate of the potential. Results show that the deposition current is limited by a mass-transfer process of lithium species in both carbonate electrolytes as already reported in other organic electrolytes. The lithium diffusion coefficient is determined from voltammograms and its dependence with temperature is investigated. Data obtained from the potential step technique can be fitted according to a 3D nucleation process only in PC solutions. (C) 1999 Elsevier Science Ltd. All rights reserved.