The invention discloses a positive
electrode material of a high-capacity
lithium ion battery and a preparation method of the positive
electrode material. The preparation method comprises the following steps: dissolving raw materials into de-ionized water to prepare a
mixed solution A and a
mixed solution B, which have the same volume and different concentrations; adding a
sodium hydroxide solution and an
ammonia water solution into a container C in a parallel flow manner to be subjected to co-
precipitation, so as to prepare a co-precipitate Ni1-x-yCoxAly(OH)2+y precursor; after
ageing, filtering, washing and
drying the prepared co-precipitate precursor, uniformly mixing the co-precipitate precursor with a
lithium source; pressing and molding
mixed materials, putting the mixture into a
pipe furnace for presintering, and
sintering the mixture in an
oxygen /
oxygen-enriching air
airflow to obtain a target product. The positive
electrode material of the
lithium ion battery, provided by the invention, has no impure phases and has high
crystallization quality; the product has a uniformly-distributed grain
diameter and a regular spherical shape, and has a very high
specific discharge capacity and relatively excellent circulating stability; the positive
electrode material can meet high-
energy density and high-power charging and discharging requirements, a process is simple and a manufacturing cost is relatively low.