Polymorph positive electrode material for lithium ion battery and preparation method of material

The invention discloses a polymorph positive electrode material with a crystal lattice structure consisting of a layered hexagonal crystal lattice and a spinel-shaped cubic crystal lattice for a lithium ion battery. The structural formula of the polymorph positive electrode is LiCo MnxNiyAlzO2, wherein x is more than zero and less than or equal to 0.3, y is more than or equal to 0 and less than or equal to 0.2, and Z is more than or equal to zero and less than or equal to 0.02. Compared with a single layered structure positive electrode material, the polymorph positive electrode material for the lithium ion battery has excellent structural stability and thermal stability and remarkable cycling property, thermal safety and multiplying property. In addition, the invention also discloses a preparation method of the polymorph positive electrode material for the lithium ion battery.