Positive electrode material precursor with high tap density and small particle size, positive electrode material, preparation method of positive electrode material, lithium ion battery and power-related equipment

The invention provides a high-tap-density small-particle-size positive electrode material precursor, a positive electrode material, a preparation method of the positive electrode material, a lithium ion battery and electric equipment. The positive electrode material precursor with high tap density and small particle size satisfies the following conditions: TD/D50 is greater than 0.9 g/(cm < 3 >. [mu] m), and D50 is less than or equal to 2.0 [mu] m. The preparation method of the positive electrode material precursor with high tap density and small particle size comprises the following steps: preparing a precipitator and a complexing agent into a base solution, adding a metal salt solution, the precipitator and the complexing agent into the base solution, controlling system pH, ammonia concentration, stirring speed and material flow, and reacting to obtain the precursor. The high-tap-density small-particle-size positive electrode material precursor provided by the invention is small in particle size and ultrahi