多孔镍和多孔氧化镍在熔融碳酸盐中原位形变行为的研究

In Situ Investigation on the Deformation of Porous Nickel and Porous Nichel Oxide in Molten Carbonate

熔融碳酸盐燃料电池在开始运行初期,承受一定负荷的多孔镍在转化为多孔氧化镍阴极的过程中往往会受到较严重的形变破坏,对电池的使用性能和寿命造成不良影响.本文采用一套自行设计研制的LVDT位移测试系统,对多孔镍和多孔氧化镍在恒载荷下的形变行为进行初步研究.结果表明,加载下的多孔镍在熔融碳酸盐中进行原位氧化、锂化时其形变最为严重;而经预先氧化锂化的多孔镍在相同实验条件下形变相对较小.多孔氧化镍在不同实验条件下的形变总体上均不明显.研究结果对防止MCFC阴极材料的形变破坏有重要指导意义.

At the early stage of MCFC operation, the porous Ni-based cathode subjected to the load of cell stack may deteriorate in the process of its transformation to the working lithiated NiO cathode, which will result in the potential damage to the cell performance and lifetime. In this study, a home-made LVDT displacement-measuring system was set up and applied in in situ deformation experiments. The deformation behaviors of porous NiO and Ni plaques were investigated under the simulating conditions of MCFC operation. The experimental results indicate that the porous nickel deforms most severely when it is in situ oxidized and lithiated under loading. However, under the same conditions the deformation of porous nickel which is pre-lithiated and oxidized before a load is applied is much less. In contrast, the in situ deformation of the porous nickel oxide is not significant as a whole.