Cobalt-free high-nickel positive electrode material, preparation method thereof and lithium ion battery

The invention belongs to the technical field of lithium ion battery materials, and discloses a cobalt-free high-nickel positive electrode material of which the chemical general formula is LiNi < x > Mn < 1-x > O < 2 >, 1; the positive electrode material is in a cube-like shape, the tap density is 2.48-2.55 g/cm < 3 >, and the compaction density is 3.71-3.78 g/cm < 3 >. Inorganic salt and an organic additive are added in a precursor mixing and sintering process, and a two-stage sintering and water washing process is adopted to prepare the cobalt-free high-nickel positive electrode material with high tap density and high compaction density, so that the high-pressure cycle performance of the battery is further improved. 本发明属于锂离子电池材料技术领域，公开了一种无钴高镍正极材料，化学通式为LiNixMn1-xO2，其中0.85≤x