The kinetics of lithium electroinsertion into a thin‐film electrode in a LiCl solution was studied by ac impedance spectroscopy between and 10 2 Hz at 25°C. The interfacial charge‐transfer process was found to be independent of the composition x in , and the exchange current density was irrespective of x , whereas the chemical diffusion coefficient, , and the partial conductivity, , of lithium depended greatly on x because of the effect of the thermodynamic enhancement factor, W . The value varied between and , reaching a minimum when x = 0.2 approximately. The , value was in the range from to . This low , value indicates the predominant contribution of electronic conductivity to the total conductivity of , which is in the order of . The results show that solid‐state diffusion of ions is a rate‐determining process in the system.
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Kanoh et al. (1996) studied this question.