Preparation of spinel lithium manganese oxide fine particles using ultrasonic spray pyrolysis method

Spinel lithium manganese oxide (LiMn2O4) fine particles are prepared by on ultrasonic spray pyrolysis method from an aqueous lithium nitrate and manga nese acetate solution. The effect of synthesis factors, such as initial con centration of feed solution and gas flow rate, on particles morphology, com position and crystallite size is examined. The effect of axial temperature profile in the aerosol flow reactor on the morphology of prepared particles is also investigated using a tubular furnace with six independently contro lled heating zones. Spinel LiMn2O4 fine particles are successfully prepared at both constant temperature distribution (1,073 K) and increasing tempera ture distribution (473 K-473 K -673 K-873 K-1,073 K-1,073 K) in the reactor . The particles prepared at a constant temperature profile (1,073 K) in the reactor are hollow spheres, which are formed by over ten nanometer size of crystallite, while those prepared at increasing temperature profile (473 K -473 K-673 K-873 K-1,073 K-1,073 K) are shrinking and not hollow spheres.