The preparation of water-based electrolyte diaphragm by tape casting method has the characteristics of high efficiency

low cost and low pollution. A process of preparing electrolyte diaphragm by tape casting mechanism was proposed

which used α-Li AlO2 as powder and the mixed solution of distilled water and polyvinyl alcohol(PVA) as binder. A large-area

high-strength and environment-friendly water-based electrolyte diaphragm was prepared by tape casting in a tape casting machine. Moreover

the performances of the diaphragm and fuel cell were tested. The results showed that

the average pore diameter of the prepared water-based diaphragm was 0.217 μm

and the porosity was 61.63%. Through assembling a 1.5 kW stack

it was experimentally verified that the maximum discharge power at constant voltage(0.7 V) was 1.718 kW

which was 13% higher than the set value(1.5 kW). The power output was stable at 1.5 kW for more than 900 hours. The research laied the foundation for later researches and developments of high-power molten carbonate fuel cell.