Study On The Preparation Of Large-Size Solid Oxide Fuel Cells Electrolyte By Tape Casting

With the development and progress of the society,the fossil energy gradually reduces and causes great harm to the environment,so people pay more and more attention to the clean and efficient energy.The solid oxide fuel cell has become the focus of people because of its advantages such as high efficiency and no pollution.At present,medium and low temperature melting is the main development direction of solid oxide fuel cell?SOFC?.The main problems are the conductivity of electrolyte and the development of medium and low temperature electrode materials to reduce the ohmic resistance and polarization resistance of the cell.At present,there are mainly two ways to improve the conductivity of electrolyte:one is to develop electrolyte materials with high conductivity at medium and low temperature,such as perovskite,scandium stabilized zirconia?ScSZ?,etc.The second is to reduce the thickness of the electrolyte,which is usually prepared by the method of fluidization and deposition.This paper mainly focuses on the influence of the organic matter content in the electrolyte flow extension size on the size and the flow extension,and obtains the optimal organic matter content of the size,so as to determine the size formula.The compound green billet of electrolyte and electrolyte anode was prepared by formula,and the sintering method and sintering system were determined.Specific conclusions are drawn as follows.The solid phase method was used to prepare 8YSZ?8mol%Y₂O₃ stabilized ZrO₂?electrolyte powder,which was sintered at 800?to form a single cubic phase structure.After that,the influence of the organic matter content in the convection slurry on the slurry and the flow length was studied.The viscosity and settlement volume of slurry decrease first and then increase with the increase of dispersant content.Under the condition of joint action of binder and plasticizer,the effect of slurry is consistent with that of dispersant.According to the data to determine the size,the content of organic matter in preparation for the stretch film electrolyte green,the green thermogravimetric-differential thermal analysis,determine the decomposition of organic matter was completely before 450?,thus determine the exhaust temperature of green,comparison of different sintering temperature?1300?,1350?,1400??,the microstructure was observed found the best sintering temperature is 1350?,sintering time of5h.In addition,different sintering methods were used to prepare large-sized electrolyte sheets.By comparison,it was found that both the calcined and the cook-fired electrolytes would produce cracks,while no cracks would occur in the electrolytes without calcination.The electrolyte sheets of about 5cm×5cm were successfully prepared.It is found that the grain size is basically the same,and there is no through hole.8YSZ electrolyte billet was prepared by fluidization method,and its conductivity was tested after sintering at 1350?for 5h,and was 0.033S/cm at 800?.The anode/electrolyte composite green was prepared by the composite flow delay method,and the semi-battery was prepared by co-sintering at 1350?for 5h.According to the microscopic morphology,the contact between the electrolyte and the anode was good,and there were no holes and other defects.Moreover,the anode pore distribution was relatively uniform and the electrolyte was relatively dense.After that,screen printing method was used to coat the GDC and LSCF on the electrolyte side of the half battery,sintering for 2h at 1300?,then coating LSCF on the GDC,sintering for 2h at 1100?,to prepare a single battery NiO-8YSZ/8YSZ/GDC/LSCF,discharge test on it,the open circuit voltage at 800?is 1.07V,close to the theoretical value of 1.1V,the highest power density in hydrogen atmosphere is 331mW/cm².The ac impedance spectrum showed that ohm resistance in 1³?,and by the rise of temperature.