Researchers in the United States have introduced a novel technique that repurposes used electric vehicle (EV) batteries into fertilizer. This innovative process utilizes an ion-exchange method to extract lithium while substituting it with potassium, allowing the essential nutrients—phosphorus, potassium, and nitrogen—to remain. This approach not only presents a solution to the growing challenge of EV battery waste but also offers a sustainable agricultural resource.
Deyang Qu, a mechanical engineering professor at the University of Wisconsin-Milwaukee, led the development of this method, highlighting its dual benefit of reducing battery waste while bolstering agriculture in Wisconsin and beyond. Currently, recycling EV batteries often incurs higher costs than the value of the recovered materials, but transforming these elements into fertilizer could change that dynamic. Conventional disposal methods for spent batteries are costly and require specialized handling, particularly for lithium iron phosphate (LFP) batteries, which dominate the EV landscape.
Backed by funding from an internal UWM grant and the USDA’s Agricultural Research Service, this project hopes to address the impending crisis of expired lithium-ion batteries, offering a much-needed solution at a time when affordable recycling options are limited. Qu emphasized that the sector needs an economically viable solution for battery waste management, which has traditionally left manufacturers and government agencies with the burden of disposal costs.
Fertilizers are crucial for enhancing crop yields and ensuring food security, and the new method could provide a domestic source of the minerals crucial for their production, decreasing dependence on imported materials. Additionally, the recycling process is expected to consume less energy since the materials won’t require extensive mining or transportation.
Looking ahead, the research team plans to scale up the fertilizer production process to conduct field trials comparing their product with conventional fertilizers and hopes to generate sufficient material for a trial of a one-acre tomato crop. This project could open pathways to marketing the innovative fertilizer concept to major companies within the industry, further bridging the gap between technology and sustainable agriculture.