LAUSR

Abstract To enhance the energy density of Li-rich layered oxide Li1.2(Ni0.133Co0.133Mn0.533)O2 (LNCMO), the seed-mediated method is explored to prepare the (Ni1/6Co1/6Mn4/6)CO3 precursors. The nucleation and growth of the spherical precursors are successfully separated and controlled with the seed-mediated method in the co-precipitation process. Therefore, the particle size distribution and then the tap density of the precursors can be tailored by the seed-mediated method. To further manipulate the properties of the carbonate precursors, (Ni1/6Co1/6Mn4/6)CO3 is prepared by the seed-mediated method at different pH values. The influences of the feeding ways and pH values in the co-precipitation process on the morphologies, particle size distributions and tap densities of the precursors are investigated. As a result, the (Ni1/6Co1/6Mn4/6)CO3 precursor with a high tap density and moderate particle size distribution is obtained. After lithiated, the LNCMO samples deliver high discharge capacities, high volumetric energy densities and stable cycle stabilities. The main reasons for these improvement are preliminarily discussed in this paper.