This Battery-Like Device Can Power a Machine, Strengthen It — and Then Be Recycled

Most batteries spend their lives as passengers.

They sit inside a phone, underneath an electric car or buried inside a drone, adding weight while the surrounding structure does the mechanical work. Engineers have spent decades trying to make those batteries lighter and more energy-dense, but there is another way to attack the problem: what if the material carrying the energy could also help carry the load?

A research team at the University of California San Diego has demonstrated a recyclable structural supercapacitor built around exactly that idea. The prototype can store electrical energy, provide mechanical stiffness and, when its useful life is over, be disassembled so key components can be used again.

That combination sounds modest until you think about what it could mean for machines where every gram matters.

A battery normally has only one job

Look inside most electronic products and the division of labor is obvious. The frame provides strength. The shell protects the components. The battery provides energy.

Each part adds its own mass and occupies its own space.

For a smartwatch, that may be a manageable compromise. For drones, lightweight electric vehicles, aircraft and mobile robots, it becomes a serious engineering problem. A heavier energy-storage system can require a stronger structure, which adds more weight, which can then require even more energy.

Structural energy storage tries to break that loop.

Instead of attaching an energy-storage device to a structure, engineers design a material or component capable of doing both jobs. A wing, panel or body section could potentially become part of the electrical system rather than simply surrounding it.

The UC San Diego team's device is a structural supercapacitor. Supercapacitors are different from conventional batteries: they generally charge and discharge quickly and tolerate many cycles, although they typically store less energy per unit of mass than modern lithium-ion batteries.

The interesting part here is not simply the chemistry. It is the architecture.

The researchers actually put it into a glider

One of the easiest ways to make an engineering idea convincing is to stop showing it on a laboratory bench.

The researchers integrated prototype supercapacitors into the wings of a small glider. The devices helped stiffen the wings while also supplying electricity to a propeller. With the motor powered by the structural supercapacitors, the glider travelled farther than it did without powered propulsion.

That does not mean commercial aircraft are about to replace their wings with giant supercapacitors. The experiment is a proof of concept, and there is a vast distance between a laboratory glider and an aviation-certified energy-storage structure.

But it demonstrates the central idea in a very physical way: the energy-storage component does not have to be dead weight.

It can become useful structure.

The clever part may be what happens at the end

Energy technology has an awkward habit of focusing on the beginning of a product's life.

We celebrate faster charging, higher capacity and lighter devices. The end of the product's life receives much less attention, even though modern electronics are creating an enormous waste stream.

The new supercapacitor was deliberately designed so it can be taken apart.

According to the American Chemical Society, the researchers disassembled one device and reused components in two subsequent supercapacitors. Those rebuilt devices performed comparably to the original in the reported tests.

That is important because many advanced composites and integrated electronics are notoriously difficult to separate once manufactured. Glues, thermoset polymers and tightly bonded layers may be excellent during use but frustrating when someone eventually needs to recover valuable materials.

Designing disassembly into the product from the beginning changes the question from “Can we recycle this somehow?” to “How easily can we recover the useful parts?”

Those are very different engineering philosophies.

A material called a vitrimer helps make it possible

The device uses a porous vitrimer-based material.

Vitrimers belong to an unusual class of polymers. They can behave like durable cross-linked materials during normal use while their chemical networks can rearrange under appropriate conditions. That gives engineers opportunities for repair, reshaping or recycling that conventional permanently cross-linked thermosets do not easily provide.

For structural energy storage, that is especially attractive.

The material needs to survive mechanical forces while also participating in an electrochemical device. Making something strong is one problem. Making it electrically useful is another. Making it possible to recover afterward adds a third.

Trying to satisfy all three requirements at the same time is where the research becomes interesting.

It also reflects a broader trend in materials science: sustainability is increasingly being treated as a design requirement rather than a cleanup operation performed decades later.

Why not just use a normal battery?

For many products, a normal battery will remain the sensible answer.

Lithium-ion technology is mature, commercially available and capable of storing substantial amounts of energy in a relatively small package. Structural supercapacitors do not magically eliminate those advantages.

Their potential appears when mass and volume become unusually valuable.

Imagine a drone whose body panels contribute to energy storage. Instead of carrying a separate energy-storage system plus a completely passive airframe, some of the same material could contribute to both functions.

The same logic could eventually apply to lightweight vehicles, robots or other machines where engineers fight constantly for grams and cubic centimetres.

That does not necessarily mean eliminating batteries. Hybrid systems are possible too: batteries could provide high energy capacity while structural supercapacitors handle rapid bursts of power, regenerative energy or secondary loads.

The most useful future system may not be one technology replacing another, but several technologies sharing the job.

This is part of a much bigger change in materials

For most of industrial history, materials have been relatively passive.

Steel provides strength. Glass provides transparency. Insulation slows heat transfer. Concrete carries loads.

That distinction is beginning to blur.

Researchers are developing materials that sense damage, change shape, harvest energy, store electricity or react to their surroundings. A wall does not necessarily have to be only a wall. A robot's skin does not have to be only a protective covering.

We recently looked at electronic skin that can give robots a sense of touch, where the surface of a machine becomes part of its sensory system. We also explored concrete that can function as energy storage, another example of turning structural material into something electrically useful.

The structural supercapacitor belongs to the same emerging philosophy: make the material do more than one job.

Recycling electronics is becoming impossible to ignore

Electronic waste is not a distant environmental problem.

The world produces tens of millions of tonnes of it each year, containing plastics, metals, circuit boards, batteries and valuable elements that required substantial energy and mining to produce in the first place.

Researchers are increasingly looking at that waste as a resource.

A separate 2026 research discussion led by scientists at the American University in Cairo highlighted how electronic waste and industrial byproducts could become feedstocks for advanced sensor materials. Other teams are developing electrochemical methods to recover valuable metals with less reliance on large quantities of chemical reagents.

The common idea is circularity.

Instead of mining material, manufacturing a product, using it and throwing it away, future electronics could be designed around recovery from the start.

That is much easier to say than to achieve.

A smartphone alone contains a complicated mixture of metals, glass, polymers, adhesives and tiny components. Integrating electronics more deeply into structural materials could make recycling even harder unless disassembly is considered during design.

That is why the recyclability of this supercapacitor is more than a nice extra feature. If structural electronics eventually become common, engineers will need ways to separate them again.

There are still major limitations

This is early-stage research, not a finished commercial battery platform.

Structural energy-storage systems face a difficult balancing act. Improve mechanical strength too aggressively and electrochemical performance can suffer. Maximize energy storage and the material may no longer be suitable as a structural component.

Safety also matters.

A conventional battery can often be placed inside a protected enclosure. If energy storage becomes part of a wing, panel or chassis, that component may experience bending, impacts, vibration and damage during ordinary use. Engineers need to know what happens electrically when the structure is cracked or crushed.

Manufacturing is another hurdle. A laboratory process can be successful while still being far too slow or expensive for mass production.

Then there is energy density. For applications that need to operate for many hours, batteries remain difficult to beat. A structural supercapacitor must provide enough mechanical and electrical benefit to justify the additional complexity.

These are not small details. They are the difference between an interesting material and a technology that appears in products people can actually buy.

Drones could be an ideal testing ground

If structural energy storage does move toward commercialization, small aerial vehicles make a lot of sense as an early application.

Drones are extremely sensitive to weight. Every additional gram affects flight time, payload and performance. They also contain large structural surfaces relative to their size, including arms, frames and wings.

A component that can provide stiffness while storing useful electrical energy therefore offers a clear theoretical advantage.

The same reasoning applies to some robotics applications. As humanoid robots become more capable, their designers will face persistent problems involving battery mass, operating time and structural weight. Multifunctional materials could eventually become another tool for solving those constraints.

Again, “eventually” is doing important work here. The new research does not demonstrate a humanoid robot powered by its own structural shell. It shows a technological direction that could make such designs more plausible.

The future machine may not have a separate battery

Today we can usually point to the battery in a device.

It is a distinct object with a clear boundary.

Future machines may make that distinction less obvious.

Their frames could store electricity. Their skins could sense touch. Their surfaces could harvest solar energy. Their structures could monitor their own damage. Materials that once performed one passive function could become active parts of the machine's nervous system and power system.

The UC San Diego structural supercapacitor is still a research prototype, but it illustrates why multifunctional materials deserve attention.

The breakthrough is not that researchers have invented a better battery.

It is that they are questioning why the battery and the structure need to be separate things at all.

And perhaps the most important part of the experiment is that, after combining those functions, they also asked how to take the device apart again.