Analysis of Dry Recovery of Lithium Ion Batteries

Dry recycling is a method of crushing, screening and separating waste lithium-ion batteries through physical methods to directly obtain lithium sulphate ions. Jin Yongxun and others use the flotation method to recover waste lithium ion batteries. The recycling process is as follows: first remove the metal casing to obtain the mixed powder of the positive electrode material, and then burn the mixed powder in the muffle furnace under high temperature conditions to obtain the acid. Lithium ion drill lithium ion oxide electrode material. The advantages of the flotation method for recycling used lithium-ion batteries are that no new pollution is added, energy consumption is low, and the shell can also be recycled. But the disadvantage is that the regenerated mixed material after the lamp burns needs to be further processed, and the charge and discharge performance is also significantly reduced. Liu Yunjian discussed how to recover lithium sulphate ions from waste lithium-ion batteries. First dissolve the aluminum diamond film with N,N-dimethylacetamide to obtain the positive electrode material, dry and grind the positive electrode material, and then burn it at 450°C for 2h and 600°C for 5h to remove the PVDF and the positive electrode material. The carbon powder is finally washed with hot water and dried to obtain lithium sulphate ions. Lv Xiaosan and others also used the high-temperature firing method to separate and recover the waste batteries, and used two methods to separate graphite and lithium sulphate ion powder: choose a liquid with a density between graphite and lithium sulphate ions to make the liquid The graphite and the lithium sulphate ion are layered to achieve the purpose of separation; or the high-temperature lamp burning method, that is, the powder is burned at a high temperature at 700° C. to obtain the lithium sulphate ion material. To sum up, the dry method of recycling waste lithium-ion batteries has a simple process and low cost, but the obtained lithium phosphate ion charge and discharge performance is significantly reduced, and the battery capacity is significantly reduced. In addition, HF generated by PVDF decomposition easily reacts with LiCo0 to produce LiF and HCoO, and HCoO is also prone to disproportionation reaction to produce CoO, which reduces the charge and discharge performance of electrode materials. Therefore, this method can only be applied to pre-recycling treatment or unqualified recycling processing. Battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Is lithium ion battery more expensive than lead-acid battery?