A　phase-field　model　for　describing　three-phase　electrode　microstructure　(i.e.,　electrode-phase,　electrolyte-phase,　and　pore-phase)　in　solid　oxide　fuel　cells　is　proposed　using　the　diffuse-interface　theory.　Conserved　composition　and　non-conserved　grain　orientation　order　parameters　are　simultaneously　used　to　describe　the　coupled　phase　coarsening　and　grain　growth　in　the　three-phase　electrode.　The　microstructural　evolution　simulated　by　the　phase-field　approach　demonstrates　the　significant　dependence　of　morphological　microstructure　and　output　statistic　material　features　on　the　prescribed　kinetic　parameters　and　three-phase　volume　fractions.　The　triple-phase　boundary　fraction　is　found　to　have　a　major　degradation　in　the　early　evolution.　(C)　2012　American　Institute　of　Physics.　[http://dx.doi.org/10.1063/1.4738230]