The U.S. government is betting on fish-like nanorobots that swim through seawater to absorb lithium ions, part of a $45.7 million push to secure critical minerals. Nineteen projects won grants from the Department of Energy’s Critical Minerals and Materials program, with the biomimetic robot concept standing out as a radical approach to lithium harvesting.
The initiative targets lithium, a metal essential for electric vehicle batteries, grid storage, and military hardware. The United States currently imports most of its lithium supply, creating strategic vulnerabilities. The fish robots project, led by researchers at the University of Texas at Austin, proposes a fleet of autonomous nanoscale swimmers that filter lithium directly from seawater, which contains trace amounts of the metal.
The grants were announced on May 27, 2026, as part of a broader $45.7 million funding round. The Department of Energy is prioritizing technologies that reduce reliance on China, which dominates lithium processing. The fish robots concept uses chemically coated surfaces to bind lithium ions, then releases them for collection when the robots are “digested” or retrieved.
Other awardees include projects for extracting rare earth elements from coal waste, recovering lithium from geothermal brines, and developing sensor networks for mineral exploration. The nanorobot team received approximately $3.2 million for a three-year proof-of-concept phase.
Industry analysts note that seawater lithium extraction has long been a theoretical holy grail: the oceans hold an estimated 230 billion tons of lithium, but concentrations are dilute (about 0.17 parts per million). If the fish robots prove scalable, they could offer an almost limitless domestic supply without the environmental costs of conventional mining.
The technology is not expected to reach commercial deployment for at least a decade. The immediate next step is laboratory testing to validate lithium binding efficiency and robot survival in saltwater environments. Success would trigger follow-on funding for pilot demonstrations.
Technology
→ Neutral
These Fish Robots Will Eat Seawater To Harvest U.S. Critical Minerals
Developing fish-like nanorobots to swim and eat lithium ions in seawater was among 19 projects to win $45.7 million in U.S. government critical mineral technology grants.
Noël Fletcher, Contributor
Forbes
2 min read
6/10
Key Takeaways
- The U.S. Department of Energy awarded $45.7 million across 19 projects for critical mineral technologies on May 27, 2026.
- One winning project proposes autonomous nanorobots shaped like fish that swim in seawater and absorb lithium ions using chemically coated surfaces.
- Lithium is essential for electric vehicle batteries, grid storage, and defense applications; the U.S. currently imports over 80% of its lithium.
- Seawater contains an estimated 230 billion tons of lithium, but extracting it efficiently is a major technical challenge.
- The fish robot team received approximately $3.2 million for a three-year proof-of-concept phase, with commercial scale unlikely before 2036.
Frequently Asked Questions
Fish robots are nanoscale autonomous machines designed to swim in seawater and absorb lithium ions through chemically coated surfaces. They mimic fish movements to navigate and filter lithium from the ocean, which contains trace amounts of the metal.
The U.S. Department of Energy awarded approximately $3.2 million to the fish robot project as part of a larger $45.7 million funding round for 19 critical mineral technologies. The grant covers a three-year proof-of-concept phase.
Seawater holds an estimated 230 billion tons of lithium, far exceeding land reserves. Extracting lithium from the ocean could provide a virtually unlimited domestic supply for batteries and defense, reducing U.S. reliance on imports, especially from China.
Commercial deployment is not expected for at least a decade. The technology is currently in a proof-of-concept phase. If laboratory tests succeed, pilot demonstrations could follow, but large-scale use is unlikely before 2036.
The $45.7 million round funded 19 projects including extracting rare earth elements from coal waste, recovering lithium from geothermal brines, developing advanced sensor networks for mineral exploration, and other novel separation technologies.
Topics
Original source
www.forbes.com
Discussion
Join the discussion
Sign in to post a comment or reply.
No comments yet. Be the first to share your thoughts!