What is the significance of recycling waste lithium iron phosphate batteries

Because lithium iron phosphate power lithium ion battery has the advantages of high specific energy, long cycle life, good safety performance, etc., it is widely used in various electric vehicles, and the average service life of lithium iron phosphate power lithium ion battery is about 3 years. Therefore, behind the large-scale processing, it means that there will be a large number of discarded lithium iron phosphate batteries every year. Lithium iron phosphate power lithium ion battery pack includes positive electrode sheet, negative electrode sheet, electrolyte and separator. The positive electrode is made by mixing lithium iron phosphate, conductive agent, binder and acetylene black in a certain proportion, and then coating it on aluminum foil. The negative electrode is made of activated carbon material and binder and then coated on copper. It is made on a foil, the electrolyte in the battery is mainly composed of organic solvent and electrolyte lithium salt, and the diaphragm is mainly a polyolefin microporous membrane. After dismantling waste batteries, it is necessary to obtain metal casings, aluminum foils, copper foils, and plastic diaphragms. Metal casings and plastic diaphragms are uniformly recycled and professionally solved, while aluminum foils and copper foils are processed differently through different solutions. Resource recycling. At the same time, before solving the waste lithium iron phosphate battery electrode sheet, it is necessary to carry out corresponding preliminary solutions based on its internal composition characteristics, including discharging the remaining battery power, disassembling the battery, and rupturing the metal casing. In the discharge solution, different solutions are adopted for different types of batteries. For small batteries with less electricity, the battery can be deactivated by immersing the electrolyte to short-circuit. For medium and large batteries such as power lithium-ion batteries, because their residual power may be relatively large, discharge equipment is usually used to discharge the battery first, and then disassemble the battery after the power is exhausted; in industrial-scale recycling companies , Usually use liquid nitrogen to solve the waste battery under the low temperature condition, make it inactivated and then disassemble the solution. At present, laboratory experiments are often straight and manual dismantling to separate the positive and negative plates, and then recycling them separately. In addition, some scholars use the method of first pulverizing the battery as a whole, and then separating it according to the physical properties of the battery pack material after it is completely pulverized. Due to its light weight, the diaphragm can be effectively separated from other battery materials by means of wind shaker or flotation. At present, the research on the recovery and solution of waste lithium iron phosphate power lithium ion batteries is focused on the lithium iron phosphate positive electrode sheet. Before obtaining the lithium iron phosphate powder, the positive electrode sheet must be solved in advance. Generally, organic solvents are used to dissolve the binder and high temperature. Sintering, dissolving the aluminum foil on the electrode sheet and other methods to obtain the lithium iron phosphate active material, and then proceed to the next step of recycling. Commonly used recycling technologies can be roughly divided into: wet recycling, fire recycling and biological leaching recycling. 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: Lithium batteries are really more explosive than lead-acid batteries?