Preparation conditions of LiMn_0.45Ni_0.45Co_0.1O₂ via hydroxide co-precipitation

Mn_0.45(OH)₂ was prepared viaimproved hydroxide co-precipitation. The effect of reaction condition on the shape of the product, and the effect of F^- ion on the morphology and tap-density of the product were studied. LiMn_0.45Ni_0.45Co_0.1O₂ and LiMn_0.45Ni_0.45Co_0.1O_1.96 F_0.04 were prepared by mixing this metal hydroxide with 5% excess LiOH followed by heat-treatment. The effect of F doping on the cycling performance of the prodct was investigated. The morphology and tap-density of the product were improved through the addition of F^- in co-precipitation system. The product was characterized using X-ray diffraction (XRD), scanning electron microscope (SEM) and charge-discharge tests. It can be seen from the SEM results that the product has a good shape. The XRD studies showed that the material had a well-ordered layered structure without impurity phase. The initial capacities of both LiMn_0.45Ni_0.45Co_0.1O₂ and LiMn_0.45Ni_0.45Co_0.1O_1.96 F_0.04 are 157 mAh· g^-1 at a charging potential between 2.8 and 4.4 V and a current density of 30 mA· g ^-1. The 72.6% and 86.0% discharge capacities were retained at the end of 50 charge-discharge cycles, respectively. It is shown that the F doping can obviously improve the cycling performance of the product.