1. The best way for general recycling companies to recycle lithium batteries is to use echelon utilization and recovery to extract lithium battery raw materials. For echelon utilization, material recovery is carried out after echelon utilization; Direct material recovery is the batch is too small, no history, safety monitoring unqualified, and so on. The pursuit of economic efficiency is the driving force of corporate and social behavior. According to the principle, the value of the battery can be maximized only when the available value of the battery is reduced to below the maintenance cost and then the raw material is recovered. But the reality is that early power lithium batteries have poor traceability, uneven quality and model. In the early stage, the echelon utilization of batteries is risky and the cost of eliminating risks is high. Therefore, it can be said that in the early stage of power lithium battery recovery, the disposal of batteries is mainly based on raw materials recovery.

　　2. The current recycling of power lithium ion battery has not achieved the comprehensive recycling and reuse of all kinds of materials on the whole battery. The types of cathode materials include: lithium cobalt acid, lithium manganese acid, ternary lithium, iron phosphate lithium ion batteries, etc. The material cost of the positive electrode of battery occupies more than 1/3 of the cost of a single battery. Because the negative electrode adopts graphite and other carbon materials, and the application of lithium titanate Li4Ti5O12 and silicon carbon negative electrode Si/C is less, the current battery recycling technology is mainly aimed at the recovery of the positive electrode material of battery. The recycling methods of waste lithium ion batteries include physical method, chemical method and biological method. Compared with other methods, hydrometallurgy is considered to be an ideal recovery method because of its low energy consumption, high recovery efficiency and high purity.

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