DEVELOPMENT OF THIN FILM SOLID OXIDE FUEL CELLS

单体电池的制备及其堆砌技术的研究是固体氧化物燃料电池发展的关键。本研究的主要目标是开发薄膜平面电池的堆叠技术并进行组装，即深入研究了平面电池堆叠的机械强度、温度分布、热膨胀和气体密封等主要问题。结果如下：为了缓解SOFC堆垛中的热应力，测量了合金隔板与氧化锆板之间的摩擦系数与温度的关系。利用摩擦测量的结果，模拟了一种新的平面电池的堆叠方法，包括薄膜电池的保护。2)空气电极柔性集流器的研制研制了可减小平面sofc空气电极热应力的柔性集流器。它们由包覆有la (Sr) mno_3细颗粒的耐热合金丝组成。将柔性集流器与1)中提到的应力分析相结合，提出了一种用于平面薄膜电池的叠层方法。该单元格堆栈被命名为“软堆栈”。在软堆中，用氧化锆环支撑薄膜电池，降低了耐热合金与氧化锆热膨胀系数差异引起的热应力。采用镍铬合金箔制备柔性集流器。

Preparation of single cells and studies of their stacking technologies are the most important for the development of solid oxide fuel cells. In this study, the main objective is to develop stacking technologies for thin film planar cells and to assembled them, that is, the major problems on the stackings of planar cells such as the mechanical strength, temperature distributions, thermal expansion and gas sealing were intensively investigated.The results are as follows.1) Analysis of thermal stresses developed in planar stacksIn order to relax the thermal stresses in planar SOFC stacks, the temperature dependence of the coefficient of friction between alloy separators and zirconia plates was measured. A new stacking method for planar cells including the protection of thin film cells are simulated using the results of the friction measurement.2) Development of flexible current collectors for air electrodesFlexible current collectors which reduce the thermal stresses developed in air electrodes of planar SOFCs are developed. They consist of heat resisting alloy wires coated withLa (Sr) MnO_3fine particles. The flexible current collector was combined with the stress analysis mentioned in 1) , and a stack method for planar thin film cells was newly developed. The cell stack was named Soft Stack. In the Soft Stack, the thin film cells were supported with zirconia rings which reduced the thermal stresses induced by the difference in thermal expansion coefficient between the heat resisting alloy and zirconia. The flexible current collectors were prepared with nickel-chromium alloy foils.