Method of reusing positive electrode material

A method of reusing a positive electrode material, comprising:

• inputting a positive electrode for a lithium secondary battery comprising a current collector, and a positive electrode active material layer formed on the current collector and including a first positive electrode active material, a first binder and a first conducting agent, into a solvent;
• separating at least a portion of the positive electrode active material layer from the current collector;
• adding second binder powder to the solvent and performing primary mixing a resulting mixture;
• and
• preparing a positive electrode material slurry by adding a second positive electrode active material and a second conducting agent to the solvent and performing secondary mixing a resulting mixture,
• wherein a ratio of a total weight of the first positive electrode active material, the first binder and the first conducting agent, which are included in a separated positive electrode active material layer, to a total weight of the second positive electrode active material, the second binder powder and the second conducting agent ranges from 8:92 to 28:72.