Mechanochemical way for preparation of disordered lithium-manganese spinelcompounds

The influence of mechanical activation of mixtures of MnO2 with LiOH and Li 2CO3, combined with the following short thermal treatment at different temp eratures, on the structure, the processes of disordering, oxygen stoichiome try and dispersion of lithium-manganese spinel has been investigated. It wa s shown that the mechanochemically prepared compounds are characterized by high dispersion, strongly compressed lattice, the increased amount of Mn (4 +) ions and two types of disordering (cation vacancies and cation mixing). The amount of defects and dispersion of product decreases and the crystalli nity increases with the temperature of the following thermal treatment, The nature of reagents and the conditions of mechanical activation (MA) influe nce on parameters of spinel, especially at moderate temperatures. (C) 2001 Elsevier Science B.V. All rights reserved.