(1) The separation effect of waste lithium-ion batteries is still not ideal in the process of disassembly and crushing. Therefore, the safe and effective separation and crushing of waste lithium-ion batteries is the prerequisite for the recycling of waste batteries.

(2) At present, in the research process of valuable metals of waste lithium-ion batteries, the recovery process of valuable metals is mainly wet. This method uses chemical substances such as acid and alkali, which will produce harmful waste gas and liquid, causing certain harm to people and the environment. Therefore, secondary pollution in the process is also an important problem to be solved.

3) In the process of recycling valuable metals from waste lithium-ion batteries, most of them focus on the recycling of valuable metals from cathode materials. The negative electrode and electrolyte are ignored. In particular, the electrolyte is mostly composed of high concentration organic solvents, electrolyte lithium salts, additives and other raw materials, which are toxic and pollute the environment. Therefore, it is necessary to find substitutes for these materials to reduce the harm of electrolyte to the environment.