The stability of LiAlO2 powders and electrolyte matrices in molten carbonate fuel cell environment

The stability of LiAlO2 electrolyte matrix is a key issue for the development of molten carbonate fuel cells (MCFCs). The phase transformation and particle growth of LiAlO2 particles, observed after a long period of cell operation, is a serious problem and must be overcome in order to attain more than 40,000 h of MCFC life. This process is accompanied by pore size increase of the matrix, leading to a loss of capillary retention for electrolyte in the matrix, causing redistribution of electrolyte and finally resulting in the cross-over of gas. Therefore, efforts have been addressed to obtain a stable matrix with an appropriate pore structure and mechanical strength to provide effective gas-sealing properties without cracks formation during MCFC operation. This review deals on the chemical stability of LiAlO2 powders in molten carbonates and the structural stability of LiAlO2 matrices in MCFCs.