MIT makes self-assembling material to revolutionise recycling of EV batteries

Researchers at the Massachusetts Institute of Technology (MIT) have developed a self-assembling material that could make solid-state electric vehicle (EV) batteries far easier to recycle. A study, published in Nature Chemistry, introduces an organic electrolyte that can very fast disintegrate when exposed to a benign liquid, allowing batteries to fall apart without the use of high heat or toxic chemicals.

Conventional lithium-ion battery recycling is hampered by the difficulty of removing the electrolyte layer that binds electrodes. The MIT research team has designed a material that dismantles itself, enabling efficient separation of components. “Instead of building batteries first and worrying about recycling later, we wanted to design recyclability into the material from the start,” explained lead author Yukio Cho, a former MIT PhD student and now a postdoctoral researcher at Stanford.

The new electrolyte is based on aramid amphiphiles (AAs), molecules structurally similar to Kevlar that provide strength and stability. By adding polyethylene glycol (PEG) chains, the researchers enabled lithium-ion transport. In water, these molecules self-assemble into strong, nanoribbon structures with ion-conducting surfaces. Pressed together, the ribbons form a gel-like solid electrolyte capable of supporting ion flow.

Proof of Concept

To test the material, the team built a solid-state battery using lithium iron phosphate as the cathode and lithium titanium oxide as the anode—both already used commercially. The PEG-based electrolyte successfully transported lithium ions, though performance was limited by slower ion movement into electrodes during rapid charging or discharging. Despite this, the researchers consider it a strong proof of concept. Importantly, when placed in organic solvents, the nanoribbon structure disassembled within minutes, allowing each component to be easily recovered.

Striving Towards Recycle-First Future

This work represents one of the first examples of a “recycle-first” approach to battery design. Cho noted that scaling such methods could be as impactful as opening new lithium mines, helping stabilize supply and prices as EV demand rises.

The researchers are now exploring ways to integrate these recyclable materials into existing battery chemistries. They believe that within the next decade, designing batteries with recyclability in mind could become an industry norm.