Abstract: This paper described the ion exchange phenomena in the layered double hydroxide compounds LiAl₂(OH)₆ X·2H₂O where X=OH^- or 1/2CO₃^2-. The
hydrotalcite-type structure of LiAl₂-LDH was remained after the anionic exchange between X^- and Cl^- or NO₃^-. Simultaneous cation exchange
was also indicated by both a strong lattice OH infrared vibration at about 940cm^-1 and the intensity decrease of the Li-O vibration. It was shown that the anion
exchange rate was much higher than the cation exchange rate, moreover, anionic exchange with Cl^- was much easier than with NO₃^-, implying a larger
transfer coefficient of Cl^- ion in the conductive interlayer of hydrotalcite structure.

Key words: anionic clays, layered double hydroxide, ion exchange, ionic conduction