A 2-STEP MODEL OF INTERCALATION

P G BRUCE, M Y SAIDI

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36 Citations (Scopus)

Abstract

The adion mechanism by which an ion crosses the interface between a liquid electrolyte and an intercalation electrode is discussed. This mechanism involves two main steps, first partial desolvation of an ion in solution adjacent to the electrode and adsorption of the ion on the electrode surface (adion formation), then rapid diffusion of the ion across the surface, loss of the remaining solvent and incorporation of the ion in the lattice. The rates of adion formation and lattice incorporation are explored as a function of temperature for the interface between a 1.4 molar solution of LiAsF6 in 2-methyl tetrahydrofuran and both cubic and layered TiS2. For both electrodes incorporation of the ions in the lattice is rate limiting. Similar activation energies for lattice incorporation into both polymorphs of TiS2 are noted. These results suggest that solvent cointercalation into layered TiS2 is not significant with this electrolyte.

Original languageEnglish
Pages (from-to)187-190
Number of pages4
JournalSolid State Ionics
Volume51
Issue number3-4
Publication statusPublished - Apr 1992

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