High-nickel-content four-element cathode material for lithium ion battery and preparation method of material

The invention provides a high-nickel-content four-element cathode material for a lithium ion battery and a preparation method of the material. The high-nickel-content four-element cathode material is composed of soluble nickel salt, soluble cobalt salt, soluble aluminum salt, soluble titanium salt and a lithium source, a chemical molecular formula of the material is Li(NixCoyAlzTiz)O2, wherein x+y+2z=1, x is greater than or equal to 0.7 and less than 1, y is greater than or equal to 0.05 and less than or equal to 0.1, and z is greater than or equal to 0.05 and less than or equal to 0.1; a ratio of mass of a nickel, cobalt, aluminum and titanium four-element material precursor formed by the soluble nickel salt, the soluble cobalt salt, the soluble aluminum salt and the soluble titanium salt to mass of the lithium source is 1: (0.5-0.6). Titanium element is introduced into a three-element cathode material to form a cathode material of a spherical structure, and shorting out in the lithium ion battery due to overhigh moisture in an environment can be avoided, so that safety and energy density of the battery are improved; tap density, fluidity, dispersity and processability of the material are improved.