Oxygen plays an active role in how energy moves through the battery's structure.
For decades, the inner life of a lithium-ion battery was thought to belong entirely to its metals — nickel, cobalt, iron — while oxygen stood quietly to the side. Researchers at Dundee and Warwick universities have now shown that oxygen is no passive witness: it actively participates in the movement of electrons during charging and discharging, a discovery that reframes what we thought we understood about the devices powering modern life. Published in Nature Nanotechnology, the findings do not yet produce a better battery, but they lay the conceptual ground from which one might grow — the kind of quiet, foundational shift that precedes transformation.
- A long-held assumption in battery science has been overturned: oxygen, once considered inert, is now confirmed to play an active role in how energy is stored and released.
- The stakes are high — gaps in understanding battery degradation have constrained the performance, lifespan, and safety of the devices underpinning electric vehicles and renewable energy storage.
- A direct comparison of battery types revealed the fault line: phosphate batteries showed little oxygen involvement, while layered oxide batteries — common in EVs — showed significant electron extraction from oxygen itself.
- Advanced computer modeling combined with laboratory experiments gave researchers the atomic-level resolution needed to see what had previously been invisible to science.
- No faster-charging battery exists yet, but engineers now have a clearer map — one that could guide the design of cells that last years longer and degrade far more slowly.
Inside the lithium-ion batteries powering phones and electric vehicles, something fundamental had been misread for years. Researchers at Dundee and Warwick universities have now demonstrated that oxygen — long assumed to be inert during charging — is actively extracting and storing electrons, directly shaping how fast a battery charges, how long it lasts, and how safely it operates.
For decades, the prevailing view held that the real electrochemical action belonged to the metals: nickel, cobalt, iron. Oxygen was present but passive. Using advanced computer modeling alongside laboratory experiments, the research team overturned that assumption, finding oxygen to be a genuine participant in the charge and discharge cycle.
The clearest evidence came from comparing two cathode types. Phosphate-based batteries showed minimal oxygen involvement. Layered oxide batteries — the kind found in many EVs and high-performance electronics — revealed something far more significant: substantial electron extraction from oxygen itself. It was not a marginal effect, but a fundamental mechanism that prior understanding had missed entirely.
The practical consequences extend well beyond the laboratory. A battery engineered with accurate knowledge of oxygen's role could charge faster, hold capacity longer, and fail less often. The gap between a battery lasting three years and one lasting seven touches the economics of electric vehicles, the viability of grid-scale renewable storage, and the volume of electronics discarded each year.
Published in Nature Nanotechnology, the findings represent foundational science — no new battery will exist tomorrow because of this paper. But the framework is now in place, and the question that remains is how quickly this atomic-level understanding can be translated into batteries that perform the way theory now suggests they could.
Inside the lithium-ion batteries that power everything from your phone to your car, something fundamental has been misunderstood for years. Researchers at Dundee and Warwick universities have now shown that oxygen, long assumed to be a bystander in the charging process, is actually doing essential work—extracting and storing electrons in ways that directly affect how fast a battery charges, how long it lasts, and how safely it operates.
For decades, scientists believed the real action during charging happened in the metal elements embedded in batteries: nickel, cobalt, iron. Oxygen was there, certainly, but it was thought to be inert—present but passive, like a spectator in the stands. The new research, combining advanced computer modeling with laboratory experiments, overturns that assumption. The team found that oxygen participates actively in both the charging and discharging cycle, playing a role in how energy moves through the battery's structure.
The discovery emerged from a careful comparison of two major types of lithium-ion battery cathodes currently in use. Phosphate-based batteries showed minimal oxygen involvement in the charging process. But layered oxide batteries—the kind used in many electric vehicles and high-performance electronics—revealed something striking: significant electron extraction directly from the oxygen itself. This wasn't a minor detail. It was evidence of a fundamental mechanism that had been invisible to previous understanding.
Dr. Hrishit Banerjee, a theoretical physicist at Dundee's faculty of science, engineering and business, frames the significance plainly. As populations have grown dependent on renewable energy systems and advanced battery storage—in phones, in cars, in the grid itself—understanding how these devices actually work at the atomic level has become urgent. Current battery technology is constrained by gaps in knowledge about why batteries degrade over time, why they fail, what limits their performance. This research begins to fill that gap.
The practical implications are substantial. If engineers can now design batteries with a clearer picture of oxygen's role in the charging mechanism, they can engineer systems that charge more quickly, hold their capacity longer, and operate more safely. The difference between a battery that lasts three years and one that lasts seven is not trivial—it affects the economics of electric vehicles, the viability of renewable energy storage, the waste stream of discarded electronics. It affects whether people can afford to switch away from fossil fuels.
The findings, published in Nature Nanotechnology, represent the kind of foundational science that doesn't make headlines but reshapes what becomes possible. No new battery exists yet. No car will charge faster tomorrow because of this paper. But the framework is now in place for the next generation of researchers to build on this understanding, to move from atomic-level insight to real-world engineering. The question now is how quickly that translation happens, and whether this knowledge can be turned into batteries that actually perform the way theory now suggests they could.
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By improving our knowledge of what is occurring at a tiny, atomic level within batteries, we can make big leaps in improving their performance in the real world.— Dr. Hrishit Banerjee, theoretical physicist at Dundee
A Conversa do Hearth Outra perspectiva sobre a história
So oxygen was just sitting there the whole time, and nobody noticed it was doing anything?
Not quite. People knew oxygen was in the battery. They just thought it was chemically inert during the charging process—that it wasn't participating in the electron movement that actually stores and releases energy. The metals were doing the work.
And now you're saying it's not inert at all?
In layered oxide batteries, no. The modeling and experiments show oxygen is actively extracting electrons. It's part of the energy storage mechanism itself. In phosphate batteries, it's still mostly passive, which is interesting in its own way—it tells us the chemistry matters.
Why does this matter for someone buying an electric car?
Right now, battery performance is limited by what we don't understand. If we can design batteries knowing how oxygen actually behaves, we can make them charge faster, last longer, and fail less often. That changes the cost and practicality of owning an EV.
Is this a breakthrough or just filling in a gap in knowledge?
It's both. It's a gap that needed filling—we were designing batteries without understanding a fundamental mechanism. But filling it opens doors. You can't engineer what you don't understand.