Preparation method of Ti-doped lithium iron phosphate positive electrode material, positive electrode material and application

The invention provides a preparation method of a Ti-doped lithium iron phosphate positive electrode material, the positive electrode material and application, and the preparation method comprises the following steps: 1) weighing a lithium source, an iron source, a phosphorus source, a titanium source and oxalic acid according to a substance amount ratio of n (Li): n (Fe): n (P): n (Ti): n (H2C2O4) = (1.01-1.03): (1-x): 1: x: 2.5 x, and carrying out batching, x = 0.01-0.05, and the titanium source does not comprise titanium dioxide; 2) carrying out ball milling on the prepared material and an ethanol solution, and drying to obtain a blocky product; 3) grinding the blocky product to obtain a powdery precursor; and putting the powdery precursor into a reaction furnace, and sintering. According to the invention, a thin and compact carbon coating layer is prepared by a gas phase method, and an in-situ Ti doping mode is adopted, so that the positive electrode material has relatively high tap density and electrochem