High Capacity Li–O[sub 2] Cell and Electrochemical Impedance Spectroscopy Study

Investigations on Li-air cell have gained great interest in recent years. In the present work, cells are fabricated with dual layer carbon electrodes consisting of an active layer and a diffusion layer employing a high surface area carbon. Discharge capacity measured at a current density of is as high as , which corresponds to . Impedance spectra recorded during different stages of cell discharge suggest that the cell resistances increase gradually due to accumulation of reaction products of reduction, namely, and inside the pores of carbon electrode.