In the process of crushing and sorting waste lithium-ion batteries, the depowdering of the positive and negative electrodes is an important process. The purpose of this step is to separate the cathode and anode materials from the other components in the battery for further utilization. The following is a detailed introduction to the steps of positive and negative electrode depowdering:
Sorting is the process of separating the crushed cathode and anode materials from other components in the battery. There are many methods of sorting, such as magnetic separation, air separation, electric separation, etc. Among them, magnetic separation is based on the magnetic difference of the ferromagnetic components in the positive and negative electrode materialsWinnowing is based on the difference in density of the positive and negative electrode materials and other components;Electrical selection takes advantage of the difference in conductivity of the positive and negative electrode materials for separation. Through the combination of multiple sorting methods, the positive and negative electrode materials can be separated from other components more effectively.
After depowdering, the collected positive and negative active material powders can be used to prepare new lithium-ion batteries or other uses. For the cathode active material powder, it can be classified and collected according to its different compositions, such as lithium cobalt oxide, lithium nickel cobalt aluminate, etc. These powders can be further processed into cathode materials or used for other industrial purposes. For the anode active material powder, mainly graphite or silicon-based materials, it can also be classified and collected according to its composition. These powders can be used to prepare new anode materials or as raw materials for novel materials such as graphene.
In the process of crushing and sorting waste lithium-ion batteries, the depowdering steps of the positive and negative electrodes are one of the most important links. Through the reasonable selection of process parameters such as pretreatment, crushing, sorting, and depowdering, the positive and negative active material powders can be efficiently separated, providing a guarantee for the optimal utilization of resources. With the continuous advancement of technology, the disposal of waste lithium-ion batteries in the future will be more environmentally friendly and efficient, so as to achieve sustainable use of resources.