The kinetics of electrochemical nucleation and three-dimensional growth of beta-LiAl during lithium incorporation into aluminum and its alloys with Mg and Si in propylene carbonate solution of 0.5 M LiClO4 were studied. The alloying components modify the kinetics of lithium incorporation and beta-LiAl nucleation: thus Mg and Si impede electrochemical incorporation of lithium and reduce the delay preceding the nucleation of beta-phase, respectively. Nuclei formation of beta-LiAl obeys a power law. An approximate:model for such a process is suggested to explain compared parameters for the nucleation of beta-LiAl on the series of substrates:studied.