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. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.