硫—氧固体氧化物燃料电池电解质片的制备与电池堆的设计制造
发布时间：2018-11-05 13:36
【摘要】：硫-氧固体氧化物燃料电池(SOFC)是一种以硫磺蒸汽或者SO2替代氢气作为燃料的新型全固态能量转换装置。目前,SOFC电池堆的结构主要分为平板式以及管式两种。相比较而言,平板式SOFC具有电性能良好、制造简单、成本低等优点,是当前SOFC研究的热点。而作为SOFC的重要组成部分,如何利用简单、低廉的方法制备出高性能的电解质薄片引起了越来越多研究者的关注。本文主要研究了不同制备条件对硫-氧SOFC电解质片的性能影响,并对硫-氧SOFC单电池的制备以及电池堆的设计制造进行了初步的探索研究。(1)通过溶胶-凝胶法分别制备了La0.8Pr0.2CrO3以及La0.7Sr0.3MnO3(LSM)粉体作为硫-氧SOFC的阳极及阴极催化剂,并对所制备的粉体进行了XRD以及SEM表征。(2)使用聚醚砜作为硫-氧SOFC电解质成型溶剂,利用正交实验方法安排制备出不同实验条件下的电解质薄片,采用涂覆的方法在薄片两侧均匀涂覆阴极、阳极浆料,经干燥烧结形成“阴极/丝网‖电解质‖丝网/阳极”单片电池结构,组装出单电池发电系统。以硫蒸汽作为燃料气体,对不同电解质片所构成的单电池进行电性能测试,通过结果分析得到硫-氧SOFC电解质片的最佳制备工艺:电解质粉体与聚醚砜的配比选择5:1(g/mL)、Na2SO4混合电解质粉体的质量百分比选择25wt%、电解质粉体的类型选择5 mol%氧化钇稳定的氧化锆(5YSZ)、复合电解质片的预烧温度选择400℃。将采用最佳制备工艺得到的电解质片组装成单电池,对其进行电性能测试,该单电池在780℃获得最大开路电压814 mV,当电池的电流密度达到93 mA/cm2时,获得最大功率密度37.7mW/cm2。(3)选用304不锈钢作为电池框架,将复合单片电池依次插入框架的间隔槽内,经密封后构成Ⅰ-型电池堆,以硫磺蒸汽作为燃料气体,对Ⅰ-型电池堆进行测试,结果表明,该电池堆在760℃获得最大开路电压697 mV;经20 h不间断工作后,电池的开路电压衰减率为5.6%;经10次热冲击循环后,电池堆开路电压衰减率达到50.7%;当电池堆的输出电流密度为104 mA/cm2时,电池堆的获得最大功率密度33.3 mW/cm2。(4)采用“不锈钢框架-电解质”一体化结构,配合电池垫片,经螺栓压实、密封胶密封最终得到Ⅱ-型电池堆,以硫磺蒸汽作为燃料气体,对Ⅱ-型电池堆进行测试,结果表明,电池堆在770℃达到最大开路电压753 mV;经20 h不间断工作,电池堆的开路电压衰减率为10.4%;经10次热冲击循环后,电池堆开路电压衰减率仅为9.4%;当输出电流密度为109 mA/cm2时,Ⅱ-型电池堆的获得最大功率密度39.4 mW/cm2,略高于Ⅰ-型电池堆,相比较而言,Ⅱ-型电池堆的性能得到了较大程度的改善。
[Abstract]:Sulfur-oxygen solid oxide fuel cell (SOFC) is a new all solid state energy conversion device which uses sulfur vapor or SO2 instead of hydrogen as fuel. At present, the structure of SOFC battery stack is mainly divided into flat type and tube type. In contrast, flat SOFC has the advantages of good electrical performance, simple manufacturing and low cost, so it is a hot spot in current SOFC research. As an important part of SOFC, how to prepare high performance electrolyte sheet by simple and low cost method has attracted more and more researchers' attention. In this paper, the effects of different preparation conditions on the properties of SOFC electrolytes were studied. The preparation of sulfur-oxygen SOFC single cell and the design and manufacture of the battery stack were studied. (1) La0.8Pr0.2CrO3 and La0.7Sr0.3MnO3 (LSM) powder were prepared by sol-gel method respectively as the sulfur- Anode and cathode catalysts for oxygen SOFC, The prepared powders were characterized by XRD and SEM. (2) Polyether sulfone was used as the solvent for the formation of SOFC electrolytes, and the electrolyte sheets were prepared under different experimental conditions by orthogonal experimental method. The cathode and anode paste were evenly coated on both sides of the thin sheet by coating method. The single cell structure was formed by drying and sintering, and the single cell generation system was assembled. Using sulfur vapor as fuel gas, the electric performance of a single cell composed of different electrolytes was tested. Through the analysis of the results, the optimum preparation process of SOFC electrolyte sheet was obtained: the ratio of electrolyte powder to polyether sulfone was 5:1 (g/mL), the mass percentage of mixed electrolyte powder of Na2SO4 was 25 wts. The type of electrolyte powder is 5 mol% yttrium stabilized zirconia (5YSZ), and the pre-firing temperature of composite electrolyte is 400 鈩，
本文编号：2312250
[Abstract]:Sulfur-oxygen solid oxide fuel cell (SOFC) is a new all solid state energy conversion device which uses sulfur vapor or SO2 instead of hydrogen as fuel. At present, the structure of SOFC battery stack is mainly divided into flat type and tube type. In contrast, flat SOFC has the advantages of good electrical performance, simple manufacturing and low cost, so it is a hot spot in current SOFC research. As an important part of SOFC, how to prepare high performance electrolyte sheet by simple and low cost method has attracted more and more researchers' attention. In this paper, the effects of different preparation conditions on the properties of SOFC electrolytes were studied. The preparation of sulfur-oxygen SOFC single cell and the design and manufacture of the battery stack were studied. (1) La0.8Pr0.2CrO3 and La0.7Sr0.3MnO3 (LSM) powder were prepared by sol-gel method respectively as the sulfur- Anode and cathode catalysts for oxygen SOFC, The prepared powders were characterized by XRD and SEM. (2) Polyether sulfone was used as the solvent for the formation of SOFC electrolytes, and the electrolyte sheets were prepared under different experimental conditions by orthogonal experimental method. The cathode and anode paste were evenly coated on both sides of the thin sheet by coating method. The single cell structure was formed by drying and sintering, and the single cell generation system was assembled. Using sulfur vapor as fuel gas, the electric performance of a single cell composed of different electrolytes was tested. Through the analysis of the results, the optimum preparation process of SOFC electrolyte sheet was obtained: the ratio of electrolyte powder to polyether sulfone was 5:1 (g/mL), the mass percentage of mixed electrolyte powder of Na2SO4 was 25 wts. The type of electrolyte powder is 5 mol% yttrium stabilized zirconia (5YSZ), and the pre-firing temperature of composite electrolyte is 400 鈩，
本文编号：2312250
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