Abstract
In this paper we compare two different approaches for the calculation of the
enhancement factor Wi
, based on its definition as the ratio of the chemical
and the component diffusion coefficients for species in mixed-conduction
electrodes, originated from the “dilute solution” or “lattice gas” models for
the ion system. The former approach is only applicable for small changes
of the ion concentration while the latter allows one to consider a broad
range of intercalation levels. The component diffusion coefficient of lithium
ions has been determined for a series of lithium intercalation anodes
and cathodes. A new “enhancement factor” for the ion transport has been
defined and its relations to the intercalation capacitance and the intercalation
isotherm have been established. A correlation between the dependences
of the differential capacitance and the partial ion conductivity on
the potential has been observed. It is considered as a prove that the intercalation
process is controlled by the availability of sites for Li-ion insertion
rather than by the concurrent insertion of the counter-balancing electronic
species.
Translated title of the contribution | Interpretation of potential intermittence titration technique experiments for various Li-intercalation electrodes |
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Original language | Ukrainian |
Pages (from-to) | 329-362 |
Journal | Condensed Matter Physics |
Volume | 5 |
State | Published - 2002 |