The invention discloses a
solid oxide fuel
cell stack and a preparation method thereof, and relates to the technical field of
fuel cells. An
electrolyte membrane layer and a
ceramic connector
membrane layer are formed by
coating a porous
ceramic framework, then back-to-back hot-pressing stacking is performed, and alternate impregnation is performed to obtain a negative
electrode and a positive
electrode, so that each repetitive unit of the
cell stack comprises a negative
electrode layer, an
electrolyte membrane layer and a positive electrode layer which are sequentially arranged; and the
anode layer in each repeating unit is connected with the
cathode layer in the adjacent repeating unit through the
ceramic connector film layer to form a
cell stack structure in which the
anode layers and the
cathode layers are alternately stacked. The structure has abundant three-phase interfaces, the electrochemical performance of the cell is outstanding, the
electrolyte and the connector are both compact ceramic films, the ohmic impedance is small, and the
power output of the cell stack is high; and the ceramic connector with the
thermal expansion coefficient consistent with that of the porous ceramic framework is adopted, the thermal stress is small, the
thermal cycle performance of the cell stack is good, the oxidation
corrosion problem does not exist, and the long-term stability of the cell stack can be improved.