How does Li2O diffuse into Co3O4 to form a LiCoO2 rhombhedral structure?

23 September 2014 1 5K Report

I would like to know the driving force or factor for this Solid State Reaction.

Please forgive me if my question is trivial. But do comment your understanding.

Both Co3O4 and LiCoO2 have the same FCC oxygen sublattice. So the reaction takes place mainly via diffusion of Li into Co3O4 and rearrangement of cations (all tetrahedral positions become vacant and Li/Co ordering appears).

My personal opinion after analysis of the HT XRD data is that some intermediate spinel phase (approximately LiCo2O4) is formed initially and only after concentration of Li becomes too high the cations start moving from tetrahedra to octahedra.

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