Effects of Al doping for Li[Li0.09Mn0.65*0.91Ni0.35*0.91]O2 cathode material

Li-rich Mn-based Li[Li0.09Mn0.65*(0.91 -aEuro parts per thousand x) Ni0.35*(0.91 -aEuro parts per thousand x) Al (x) ]O-2 cathode materials have been prepared by traditional solid-state reaction. The lattice parameters a, c, and V have decreased, but c/a increased with the increase of Al doping. All the samples show analogy morphology of a quasi-spherical shape. Li[Li0.09Mn0.591Ni0.319]O-2 sample shows a higher initial discharge capacity of 239.4 mAh g(-1) at 20 mA g(-1), while Li[Li0.09Mn0.582Ni0.314Al0.015]O-2 sample presents a higher discharge capacity of 170.1 mAh g(-1) and ratio of 72.0 % with 200 vs. 20 mA g(-1). The solid electrolyte interface resistance (R (SEI)) and charge transfer process resistance (R (ct) ) values are relatively smaller for Al-doped samples than those of non-doped samples. Almost no reduction is observed after 24-time cycles in different discharge rates for the samples prepared.