From the perspective of household and industrial waste, used batteries have been a problem for decades. While battery technology has changed a lot, even the most advanced rechargeable lithium-ion batteries can still contain materials that are considered harmful. Batteries contain metals such as mercury, lead, cadmium, nickel and silver, which pose a threat to human health and safety as well as the environment. Some batteries (such as lithium-ion batteries) also contain cobalt and lithium, two elements that are considered important minerals, that is, they are necessary for our society. When the battery is discarded, these resources will never be recycled, resulting in a waste of resources. Second, at the end-of-life stage of any modern electronic device, improper handling, storage and disposal increases the risk of fire or poisoning.
The bigger problem is that the real “battery crisis” is still to come. And we’re not just talking about lithium batteries in mobile phones. Dealing with the large number of batteries from electric vehicles is the real challenge – and we should take advantage of existing recycling technologies to meet this challenge. Fortunately, lithium-ion battery recycling is starting to take off.
Gain a Brief Understanding on the Construction of Lithium-ion Batteries
Lithium-ion batteries are made of four components – anode, cathode, electrolyte and separator.
Cathode: This is a positive electrode, which is a source of lithium ions. The voltage and capacity of the Li-ion battery is decided by this electrode. The cathode is produced by gluing a mixed-metal powder to an aluminum current collector using polyvinylidene fluoride (PVDF). The electrochemically active mixed-metal powder is used for this purpose.
- Anode: This is a negative electrode where lithium ions are stored. They enable the current flow through the external circuit. They comprise PVDF, graphite, and copper foil.
- Electrolyte: It is made of solvents, salts, and additives, and they facilitate lithium ion flow between the cathode and anode.
- Separator: It is a physical barrier that separates the anode and cathode.
Lithium-ion battery manufacturers use an expensive binder solvent such as N-methyl-2-pyrolidone (NMP) to process these electrodes.
What is the Importance of Lithium-ion Battery Recycling?
Lithium-ion battery recycling assures several benefits:
- There are many valuable and useful materials in lithium-ion batteries: cobalt, iron, nickel and others. Especially when it comes to metals like cobalt and nickel, mining and processing these materials can be costly both economically and environmentally, making it useful to recycle and reuse them whenever possible. As time goes on, rare metals like cobalt will only become more difficult to mine, leading to more money being spent on extraction.
- In many LIBs, the concentrations of manganese, lithium, along with nickel, and cobalt are high, which often exceeds the concentration of highly enriched ore. Thus, if these metals get recovered from end-of-life batteries on a large scale, they can give the same benefits as natural ore.
- Recycling would help reduce electronic waste from ending up in landfills.
- Almost 50% of the cobalt used in batteries comes from countries like Congo. Challenges like illegal mining, environmental harm, armed conflicts, and human rights abuses have been rampant in these countries. Recycling lithium-ion batteries would help reduce the dependency on these materials, improve the security of the supply chain, and reduce the human and environmental impact brought by these batteries.
- Recycling lithium-ion batteries can also have social benefits, such as reducing the risk of human exposure to toxic chemicals. If the battery is not handled properly, it can release toxic chemicals into the environment, which can have a negative impact on nearby communities. Recycling these batteries reduces the risk of exposure to these chemicals and helps protect the health and well-being of the community.
How to tell if a lithium-ion battery is damaged?
Lithium-ion batteries have a variety of potential safety hazards, so you need to know when your lithium-ion battery is dead.
If you notice any of the following symptoms, replace the battery immediately and make sure the old battery is properly recycled.
1. Voltage and/or capacity drop
Check what kind of lithium battery you have and look for the manufacturer’s specifications. Here you can find information about voltage and capacity. Then try to measure the voltage and resistance when fully charged.
2. The battery quickly self-discharge
All batteries self-discharge, which means they lose charge even when they’re not powering the device. However, lithium-ion batteries in good condition usually do not self-discharge quickly.
If you suspect that the battery is broken, disconnect the battery from the device for a few hours. Measure the charging capacity before and after disconnection. If the number exceeds the value provided by the manufacturer, the battery may have failed.
3. The battery overheats
Overheating is one of the most common signs of damage to lithium-ion batteries. However, still make sure to check the battery specifications to understand its normal operating temperature.
Batteries will heat up under heavy use, but if the temperature is much higher than specified on the specification sheet, there is a risk of damaging not only the battery, but also the equipment that powers it.
4. Battery bloating
If you miss the first three alarms, flatulence is definitely a sign that you should stop using lithium-ion batteries immediately. There is little you can do but look for the nearest recycling center.
Unfortunately, when flatulence occurs, there is a chance that the battery has damaged the device as it tries to force it out.
How to recycle lithium batteries?
Lithium-ion batteries can be recycled to recover valuable materials and reduce the environmental impact of disposal. The battery recycling process consists of several steps: collection, sorting, processing, and further processing as needed.
1. Collection, sorting and processing
The first step in recycling lithium-ion batteries is collection. Lithium-ion batteries can be collected from a variety of sources, including consumer electronics, electric vehicles, and energy storage systems. Collection can be done through municipal recycling programs, garbage collection points, or mail programs. Lithium-ion batteries must be handled carefully during collection to prevent damage or short circuits.
Once collected, lithium-ion batteries are classified according to their chemical and physical properties. Different types of lithium-ion batteries may contain different types of positive and negative electrodes, which require further processing methods. Classification also helps identify batteries that are damaged or contain impurities that could affect the recycling process.
After the batteries are sorted, they are processed to recover valuable materials. The disposal method depends on the type of battery and the material to be recycled. Standard processing methods include mechanical crushing, hydrometallurgical process and pyrometallurgical process.
2. Mechanical crushing and hydrometallurgical processes
Mechanical crushing is a process that involves breaking the battery into small pieces using a crusher and a shredder. The resulting material is then separated into different parts using a sieve and magnetic separator. This process is typically used for batteries that contain a high proportion of valuable metals, such as cobalt, nickel and copper.
Hydrometallurgical processes involve the use of chemicals to dissolve metals in batteries. The process is typically used for batteries with a high lithium content, such as those used in electric vehicles. The resulting solution is then purified and the metal is recovered using precipitation, ion exchange, or electrochemical processes. Elcan Industries has advanced technologies that can help companies in the field efficiently recycle all of these valuable materials, including black matter. Black matter is a mixture of several components, such as lithium, cobalt, nickel, manganese, copper and aluminum. It also contains graphite as well as other non-metallic elements such as plastics, electrolytes and adhesives. The black material is usually a fine black powder that requires further processing to separate and recover the valuable metal. Elcan has successfully helped the company separate black matter down to 2 microns on our elbow jet air classifier.
The black matter is a key intermediate in the lithium-ion battery recycling process because it contains many of the valuable metals used in these batteries. By recovering these metals, the recycling process can reduce the need for new mining and processing of these materials, which can be extremely expensive, resource-intensive and environmentally damaging. The black material can also be reused to make new batteries, reducing the need for new materials and promoting a circular economy.
3. the pyrometallurgical process
The pyrometallurgical process involves the use of high temperatures to melt and separate metals in a battery. The process is typically used for batteries with low levels of precious metals, such as those used in consumer electronics. The resulting molten metal can be cast into ingots or further refined to recover more metal.
Tips to avoid the risks associated with lithium-ion battery recycling
Lithium-ion battery recycling requires specialized equipment and processes. That’s why they can only be handled by well-equipped and dedicated recycling teams. The sensitivity of these batteries requires careful handling prior to shipment. Failure to properly dispose of damaged, defective, or obsolete lithium-ion batteries can increase the risk of thermal runaway events. There are a few precautions to take when handling these batteries.
If it is safe to do so, remove damaged or defective batteries from the device. If it is not safe, leave the battery in the device and recycle the entire device.
- Store defective batteries in an anti-static bag.
- Store the container in a dry and cool place to avoid fire.
- Always be sure to deliver them to a certified recycling team that can safely handle hazardous materials.
- Be sure to close exposed connectors with tape or a cap.
Things you shouldn’t do
- Do not place damaged or defective batteries in regular bins.
- Do not puncture or squeeze the battery to avoid short circuit or leakage.
- Do not store damaged or defective batteries near flammable materials.
- Do not store these batteries in large quantities nearby.
conclusion
Lithium-ion batteries are crucial in many modern technologies, but they have a limited lifespan and eventually need to be replaced. Recycling these batteries is critical for a number of reasons, including reducing the environmental impact of disposal, recovering valuable materials, and reducing the need for new materials. The recycling process involves multiple steps, including collection, sorting and processing, and can bring multiple benefits, including environmental, economic and social benefits. As the use of lithium-ion batteries continues to grow, it is important to prioritize responsible disposal and recycling to ensure a sustainable future.