Lithium Phosphate reaction using Gibbs energies

I would like to know if it’s possible to calculate the Gibbs reaction energy in a Lithium Phosphate battery using:


$\ce{G^o(Products)} - \ce{G^o(Reactants)}$


where the overall reaction is:


$\ce{LiC6 + FePO4 <=> C6 + LiFePO4}$


So far I have been unable to find the Gibbs energies for all the various components and if I try and start from their individual atoms etc I get a ridiculous answer. The only possible value I seem to be able to get uses the cell voltage i.e. ΔG° = - z F ΔE°


Is there a worked Gibbs energy calculation published anywhere?


