Preparation method of surface titanium nitride deposited high-nickel ternary positive pole piece of lithium battery

The invention relates to a preparation method of a surface titanium nitride deposited high-nickel ternary positive pole piece of a lithium battery. The specific method comprises the following steps of: weighing high-nickel ternary positive pole powder, carbon nanotube size and polyvinylidene fluoride powder according to a mass ratio, weighing N-methyl pyrrolidone of which mass is (15 to 30) timesof mass of the polyvinylidene fluoride powder, preparing high-nickel ternary positive pole size, and coating the sieved high-nickel ternary positive pole size on the upper and lower surfaces of an aluminium foil by using a transfer type coating machine to obtain the high-nickel ternary positive pole piece; preparing titanium nitride suspension from titanium nitride nano powder; and spraying the titanium nitride suspension to the surface of the high-nickel ternary positive pole piece by an ultrasonic atomization preparation system to obtain the high-nickel ternary positive pole piece of which the pole piece surface is