Synthesis optimization of Li 1 + x[Mn 0.45Co 0.40Ni 0.15]O 2 with different spherical sizes via co-precipitation

Abstract

Li 1 + x [Mn 0.45Co 0.40Ni 0.15]O 2 spherical cathode materials with different sizes (about 2 and 5 μm) were fabricated by calcining uniform spherical metal carbonate, [Mn 0.45Co 0.40Ni 0.15]CO 3 with lithium hydroxide at high temperature. The precursor of spherical metal carbonate, [Mn 0.45Co 0.40Ni 0.15]CO 3, was obtained via co-precipitation method at room temperature, which was significantly dependent on synthetic conditions, such as the reaction temperature, the concentration of NH 4HCO 3, and stirring speed, etc. The optimized condition resulted in [Mn 0.45Co 0.40Ni 0.15]CO 3, of which the particle size distribution was uniform and the particle shape was spherical. The final products, Li 1 + x [Mn 0.45Co 0.40Ni 0.15]O 2, had a well-ordered layered structure and uniform homogeneity. Raman spectroscopy analysis showed the Raman-active species E g and A 1g modes were observed at 488, 473 cm − 1 and 597, 590 cm − 1 , respectively, for the obtained spherical cathode materials.