The invention relates to a method for
oxidizing agent-aided restoration of failed
lithium cobalt oxide under reinforcement of an ultrasonic field. The method comprises the following concrete steps: disassembling a
lithium ion battery to obtain a positive
electrode aluminum foil film, calcining the positive
electrode aluminum foil film and shaking the positive
electrode aluminum foil film to allow
lithium cobalt oxide to fall off from a
current collector aluminum foil so as to obtain a powdery
lithium cobalt oxide material; immersing
lithium cobalt oxide powder into a
lithium hydroxide solution, dumping mixed liquor into an ultrasonic reaction vessel after mixing, adding an
oxidizing agent, rapidly sealing the ultrasonic reaction vessel, carrying out heating to a temperature of 120 DEG C and applying
ultrasonic radiation for 8 to 10 h; and after cooling of the ultrasonic reaction vessel, taking out a
mixed solution and carrying out cleaning, filtering and
drying so as to obtain a restored
lithium cobalt oxide material. The method provided by the invention can effectively remove a part of organic matters adhered onto the surface of lithium
cobalt oxide, increases lithium
ion content in the failed lithium
cobalt oxide and enables electrochemical performances of the restored lithium
cobalt oxide material to be regenerated; the restored lithium
cobalt oxide material can be used as a positive
electrode material again for production of a new
lithium ion battery; the method has the advantages of simple operation, easily controllable process, low
energy consumption, environment friendliness and no generation of secondary pollutants.