摘要:固体氧化物燃料电池(SOFC)因其具有高效、清洁、安全、灵活等优点，被誉为21世纪最受欢迎的绿色发电技术。随着能源的短缺和环境污染的加剧,燃料电池发电技术越来越受到人们的青睐。近年来，SOFC已成为国内外研究新能源转化的一大热点。接触层-阴极界面粘附对于固体氧化物燃料电池（SOFC）的耐久性是重要的。目前为止，在固体氧化物燃料电池的材质选择中，金属极因为高电导率，廉价，已加工等特点，成为中温固体氧化物燃料电池连接极的首选材料，但是，金属极和陶瓷阴极链接的时候，接触面的电阻会很高，这会严重影响到电池堆的性能。目前解决接触电阻高的问题，大多是采用加入贵金属[6]和陶瓷涂层接触材料的方法，但是由于贵金属成本太高，而陶瓷涂层仍然是陶瓷和陶瓷两个硬表面接触的原因，有效接触面积很小，导致接触电阻依然偏高。因此，本文提出在接触层和阴极之间使用导电接触层可以降低电池面积电阻率（ASR）。

有研究表明，影响接触电阻的原因有很多，增大陶瓷涂层与接触层的有效面积能很好的减少接触电阻。本实验采用溶胶凝胶法制备阴极材料。将Sr(NO3)2、La(NO3)3‧nH2O、Fe(NO3)‧9H2O、C6H8O7‧H2O与乙二醇按比例以一定顺序混合、溶解、加热蒸发、干燥，在300℃条件下加热自燃，获得La0.6Sr0.4FeO3先驱体。后经过压片、烧结获得阴极材料。同样采用溶胶凝胶法获得接触材料LNFO。采用四电极法测量电阻。将接触材料通过一定方法涂抹在阴极上并与不锈钢组成接触电阻测试装置，测试接触电阻。将接触材料涂抹在阴极上，接上导线之后直接测量电阻，从而得出接触电阻。实验测得随着温度升高，接触电阻呈下降趋势。

关键词：接触电阻；溶胶凝胶法；La0.6Sr0.4FeO3；接触材料

Abstract:Solid oxide fuel cell (SOFC) with high efficiency, clean, safe, flexible and so on, known as the 21st century green power generation technology. With the energy shortage and the deterioration of environmental pollution, fuel cell power generation technology more and more people of all ages. In recent years, SOFC has become a hot research at home and abroad. Interconnect-cathode interface adhesion is important for the durability of solid oxide fuel cells (SOFC). Metal connection is highly preferred because of its high electrical conductivity, low cost, easy processing, etc. It is the preferred material for medium temperature solid oxide fuel cell connection poles. However, the ceramic / metal interface of metal connecting electrode and ceramic cathode material leads to interfacial contact resistance High, seriously affecting the performance of the battery stack. The current solutions are mostly made of precious metal and ceramic coating contact materials, but the cost of precious metals is too high, while the ceramic coating is still ceramic and ceramic two hard surface contact, effective contact area is very small, resulting in high contact resistance. Therefore, it is proposed to reduce the battery area resistivity (ASR) by using a conductive contact layer between the interconnect and the cathode.

Studies have shown that the size of the pressure will affect the contact resistance. In this experiment, the preparation of cathode materials using sol gel method. Use Sr(NO3)2、 La(NO3)3‧nH2O、Fe(NO3)‧9H2O、C6H8O7‧H2O and ethylene glycol in proportion and a certain order of mixed dissolved, heated and evaporated to obtain the gel, dry and dry gel obtained at 300 ℃ under the conditions of spontaneous combustion heating to obtain    the

initial sample. After the tablet, sintered to obtain the cathode material. The contact material was also obtained by sol-gel method. The resistance is measured by a four-electrode method. The contact material is applied to the cathode by a certain method and assembled into a battery device with the stainless steel to measure the resistance. Apply the contact material to the cathode, and then measure the resistance directly after connecting the wires to obtain the contact resistance. The contact material is replaced with another material for testing, comparing the size of the contact resistance.The contact resistance was measured with the increase of temperature.