Method for recovering waste lithium cobalt oxide battery

A method for recycling a spent lithium cobalt oxide battery, comprising the following steps:

• S1:
• putting black powders from a lithium cobalt oxide battery into a column-shaped container, adding a first acid to the column-shaped container for leaching until solids in the column-shaped container no longer decrease, to obtain a first leachate and a leaching residue, wherein the first acid is selected from the group consisting of methanoic acid, acetic acid, benzoic acid and a mixture thereof, and the concentration of the first acid is 0.1-35 wt %;
• the bottom of the column-shaped container is provided with a filter structure;
• the first acid has a temperature of 35-80° C., and the first acid further contains sodium thiosulfate in an amount of 0.1-12 wt %;
• and
• S2:
• adding a second acid to the column-shaped container containing the leaching residue for leaching until solids in the column-shaped container no longer decrease, to obtain a second leachate and graphite, wherein the second acid is a strong acid selected from the group consisting of hydrochloric acid, phosphoric acid, sulfuric acid, nitric acid and a mixture thereof.