In view of the current electric vehicle and energy storage market, the problem of lithium- ion battery waste derived from it is becoming more and more serious. If the materials contained in the above-mentioned waste batteries can be effectively reused, this project is expected to develop direct repair of waste cathode materials and direct recycling Research work on lithium carbonate and transition metal salts and the development of high-efficiency discharge agents. Through the above-mentioned research work, it is possible to effectively recycle and reuse the cathode material that occupies the highest cost in lithium-ion batteries, and at the same time extract high economic value lithium and transition metal elements, realizing an important link in my country's circular economy. Furthermore, the battery cells and battery modules are effectively deep-discharged to facilitate dismantling and recycling by the environmental protection industry. This study considers the dependence on high- concentration brine in the past, and it is expected to develop a high-environmental protection deep-discharge solvent for subsequent replacement.

Lithium ion battery, Cathode recycling, Discharge agent