| 摘要 |
PROBLEM TO BE SOLVED: To recover a valuable material such as rare metal from a used secondary lithium ion battery at a high recovering rate by soaking an electrode of the used secondary lithium ion battery in an acidic solution or the like, and separating the electrode into an electrode material and a current collecting body. SOLUTION: A used secondary lithium ion battery is disassembled, and an electrolyte is completely removed from an electrode, and is soaked in a solvent, and is cleaned. This electrode is soaked in any one of an acidic solution (such as hydrogen halide, sulfuric acid, hydrogen peroxide, nitric acid, etc.), a hydroxide solution of alkaline metal (such as sodium hydroxide or potassium hydroxide), an alcohol solution (such as a lithium alkoxide, sodium alkoxide, etc.) of alkaline metal or an organic solvent (such as ketone and ester), and is separated into an electrode material and a current collecting body. This electrode material is soaked in the acidic solution, and after valuable metal is dissolved, the valuable metal can be inexpensively recovered with high purity by chemical treatment. |
