Recovery method of positive electrode pole piece of lithium ion battery

The invention provides a recovery method of a positive electrode pole piece of a lithium ion battery. The recovery method comprises the following steps of 1) enabling a waste positive electrode pole piece to be suspended in a heating furnace to be subjected to high-temperature baking at a temperature of 300-600 DEG C for 90-400min; 2) after the positive electrode material on the positive electrode pole piece falls off, cooling and collecting the positive electrode material for use, and recycling metal foil sheets; 3) performing pressing and shaping on the positive electrode material and then fixing the material at one end of a metal wire; 4) immersing the positive electrode material into molten salt, wherein the metal wire or a metal rod is used as the cathode, the molten salt is used as an electrolyte and the temperature is kept at 500-700 DEG C, an inert electrode is used as the anode, and the positive electrode material is molten and electrolyzed under the protection of an inert gas; and 5) forming lithium