EV Battery Recycling Trends

Batteries are the heart and soul of electric vehicles, and when they reach the end of their life, simply discarding them is not an option if we are to achieve ambitious sustainability goals. Instead, terms like circularity and recycling are often used, so let us explore the current options available at the end of an EV battery's life.

Elayne, what options are available for an EV battery at the end of its life?

When batteries reach the end of their automotive life, there are several pathways depending on their state of health and the infrastructure available to process the battery. Incineration and disposal are the least energy-efficient options and do not allow for any recovery of materials. Recycling involves breaking down the battery into its individual components and extracting valuable materials for refinement and reuse. This process typically includes shredding the battery and separating the materials using energy-intensive chemical or physical processes to recover as much of the valuable materials as possible. This approach has been the most extensively studied for EV batteries, and infrastructure is rapidly expanding in the UK and EU as more batteries reach their end of life (EOL).

“Reusing” broadly refers to other methods that enable a second life for the battery, including refurbishing or restoring. A second life can either be in another vehicle or in less energy-intensive applications such as stationary energy storage. These applications not only require less energy to process the battery at its EOL but also preserve the manufacturing value of the battery as well as its material value.

What are the key drivers behind battery recycling?

There are several factors to consider for innovation in battery circularity. One of the most important drivers behind battery recycling is already reflected in terms like “rare earth metals”: Many of the high-end materials used in batteries are scarce. Declining reserves and the increasing difficulty and cost of mining make the situation even more challenging. Wasting such limited resources is therefore far from ideal, and saving money has always been a strong motivator for innovation, which also applies to recovering high-value materials from EV batteries.

Most of these rare earth metals required for battery cathodes originate from Asia, Africa, and South America, making them expensive to mine and transport. The second factor involves retaining critical battery materials within the value chain so they can be used and reused in the next generation of electric mobility solutions. Lastly, the EU Battery Directive is being updated to include stricter rules on battery manufacturing, traceability, collection, and recycling to improve the end-of-life process for EV batteries and make them easier to maintain.

Why is EV battery circularity increasingly important for manufacturers and OEMs?

As of today, the body of the car has a higher carbon footprint than the EV battery. However, technology for green steel and steel recycling is rapidly advancing, meaning the battery will soon become the largest contributor to carbon emissions within the EV. There is still a significant gap in achieving efficient battery remanufacturing and recycling, which is why we need to develop new technologies for batteries now.

The trend towards battery-electric mobility is relatively new, and as the focus is on developing higher-performing batteries with increased range and durability, battery recycling has not been a top priority to date. At present, there are mainly three EV battery recycling methods: direct/mechanical, pyrometallurgical, or hydrometallurgical.

In direct or mechanical recycling, EV batteries are shredded into small pieces and further processed to separate different materials such as copper, aluminium, cobalt, nickel or lithium to reuse them in battery manufacturing or other products. Direct or mechanical recycling doesn’t require the use of chemicals or high temperatures but with current methods, not all materials in the battery can be recovered. Additionally, it may not be suitable for all types of EV batteries, and the limited scalability of this technology could become an issue if EV battery volumes increase.

As with mechanical recycling, EV batteries are shredded into smaller pieces in both hydrometallurgical and pyrometallurgical recycling processes. Pyrometallurgical recycling is a more established technology where extreme heat is used to recover most of the rare earth metals, which are then purified and circulated back into new feedstocks. Hydrometallurgical methods use chemical solutions to separate and extract different materials, particularly metals such as cobalt, nickel, and lithium, which can be used in new batteries. Hydrometallurgical recycling uses less energy than pyrometallurgical recycling and can achieve a higher recovery rate of metals than direct mechanical recycling, but it can be more expensive as it requires a significant amount of energy and resources, and the proper handling of hazardous chemicals can be challenging.

With more EV batteries reaching the end of their life, battery recycling methods are improving, and innovative approaches for second-life applications of EV batteries, such as in energy storage systems, are evolving. 

Thank you, Elayne, for these insights into battery recycling, as this is becoming increasingly important with more EV vehicles on the roads worldwide and the increasing age and use of their batteries. Today, materials and products are mainly optimised for performance and safety, but perhaps recyclability and the end-of-life of all components will soon become a major focus for engineers.