As the world depends more on electric devices and clean energy, the demand for battery materials like lithium, cobalt and nickel is rising quickly.
These materials are limited and often come from only a few parts of the world, which makes supply uncertain.
At the same time, most used batteries are not recycled and end up in landfills, where they can release harmful chemicals into the environment.
Now, researchers at Rice University have developed a new and much gentler way to recycle batteries.
Their method can recover almost all of the valuable materials inside used lithium-ion batteries using a process that involves plasma and a mild acid similar to what is found in lemon juice.
The study, published in Advanced Materials, shows that this new approach could make battery recycling more efficient, cheaper and environmentally friendly.
When batteries are recycled today, they are first broken down into a powder called “black mass.” This material contains important elements such as lithium, cobalt, nickel, manganese and graphite.
However, extracting these materials usually requires very high temperatures and strong acids, which consume a lot of energy and can damage some components.
One major problem is graphite, which makes up about one-fifth of a battery. It is rarely reused because it becomes damaged during traditional recycling. Lithium is also difficult to recover efficiently, which limits the overall success of recycling efforts.
The new method tackles these problems in a different way. First, the researchers use a short burst of microwave-induced plasma, which is an energized gas made of charged particles. This plasma treatment breaks down the battery materials and prepares them for easier extraction.
After just 15 minutes of plasma treatment, the black mass is placed in a solution of citric acid, a weak acid commonly found in fruits like lemons. At room temperature, this solution is able to recover more than 90% of the metals, including nearly all of the lithium. In total, the process can recover close to 95% of valuable materials.
At the same time, the treatment helps clean and repair the graphite. Tests showed that the recovered graphite performs very well when reused in new batteries, which is a major advantage over current methods.
The researchers say this process could be added to existing recycling systems as a simple pretreatment step. Because it uses less energy and milder chemicals, it could reduce environmental impact while improving how much material is recovered.
The technology has already been patented, and the team is now working toward bringing it into real-world use. Early analysis suggests it could outperform current industrial recycling methods, especially because it allows graphite to be reused instead of wasted.
Overall, this new approach offers a promising solution to one of the biggest challenges in clean energy: how to recycle batteries efficiently and sustainably. By turning waste into valuable resources with a process as simple as plasma and a lemon-like acid, scientists may have found a smarter way to power the future.
Source: Rice University.
