Li/Li sub 3 N Electrode: Study of Its Electrochemical Behavior in an Organic Electrolyte by Electrode-Impedance Spectroscopy

摘要

Lithium nitride has been studied as a possible solid-electrolyte interphase between the lithium electrode and an organic electrolyte. The Li/Li sub 3 N electrode has been obtained by exposing lithium to a pure nitrogen atmosphere at ambient temperature. This formation is found to result in a porous lithium nitride film, associated with a decrease in the molar volume during the reaction. The impedance behavior of the Li/Li sub 3 N electrode can be interpreted by a porous-film model deduced from a transmission-line model. The slow filling of the micropores of the film and reaction of the lithium with electrolyte at the pore bottom are responsible for changes of impedance and open circuit potential with time and under cycling. (ERA citation 12:009223)