Korean J. Chem. Eng., 19(4), 638-644 (2002)†To whom correspondence should be addressed. A Study of Electrochemical Kinetics of Lithium Ion in Organic Electrolytes

Abstract−Limiting current densities equivalent to the transport-controlling step of lithium ions in organic electrolytes were measured by using a rotating disk electrode (RDE). The diffusion coefficients of lithium ion in the electrolyte of PC/LiClO4, EC: DEC/LiPF6 and EC: DMC/LiPF6 were determined by the limiting current density data according to the Levich equation. The diffusion coefficients increased in the order of PC/LiClO4<EC: DEC/LiPF6<EC: DMC/ LiPF6 with respect to molar concentration of lithium salt. The maximum value of diffusivity was 1.39×10−5cm2/s for 1 M LiPF6 in EC: DMC=1: 1. Exchange current densities and transfer coefficients of each electrolyte were determined according to the Butler-Volmer equation