Air Exposure Turns Manganese Into a Hidden Battery Flaw
A Hanyang University study finds that letting manganese-coated high-nickel cathode precursor sit in air triggers chemistry that speeds up degradation later, complicating the cobalt-free push.
Researchers at Hanyang University in South Korea found that exposing precursor material for manganese-coated, high-nickel cobalt-free cathodes to air causes subtle chemical changes that later accelerate battery degradation and may shorten EV battery lifespans.
A cathode chemistry the battery industry has been leaning on to cut cobalt out of electric vehicles has a vulnerability that shows up long before a cell ever reaches a car. Researchers at Hanyang University in South Korea report that exposing the precursor material used in manganese-coated, high-nickel cathodes to air sets off subtle chemical changes that later accelerate degradation — meaning a pack can lose capacity faster than its design implies, for reasons rooted in how the powder was handled on the factory floor.
The finding, reported by Charged EVs, lands in the middle of an industry-wide migration away from cobalt. Cobalt-free, high-nickel cathodes — including designs that coat a nickel-rich core with manganese — have been promoted as a way to push driving range up while reducing exposure to an expensive and geopolitically awkward critical mineral. The Hanyang work does not say that approach is wrong. It says the approach is more sensitive to process discipline than its promoters have assumed.
Why the precursor stage is where the damage starts
Cathode manufacturing begins with a precursor: a co-precipitated hydroxide powder containing the metals — nickel, manganese and, in older chemistries, cobalt — in the proportions the finished cathode requires. That powder is later mixed with a lithium source and fired at high temperature to form the active material that goes into a cell.
The precursor stage is not glamorous, and it is frequently where cost gets squeezed. Powder is stored, moved between buildings, sometimes shipped between countries, and it sits in air while it waits. The Hanyang result matters because it identifies that waiting period as consequential. Nickel-rich surfaces are already known within the field to be reactive; the study points to manganese as an active participant in changes that occur before the material is ever lithiated, changes that do not announce themselves in an initial capacity check but surface later as faster fade.
That is the awkward part for manufacturers. A defect that appears at first cycle is a quality-control problem and gets caught. A defect that only expresses itself over hundreds of cycles is a warranty problem, and it gets caught by customers.
What cathode makers would have to change
If the mechanism holds up in scaled production, the remedies are mostly operational rather than scientific. Inert-atmosphere handling — nitrogen or argon blanketing of precursor storage and transfer — is standard in some plants and absent in others. Sealed containers, controlled humidity, and above all shorter dwell times between co-precipitation and calcination all become quality variables rather than logistics conveniences.
None of that is free. Inerting a powder-handling line adds capital cost and consumes gas continuously. Tightening the clock between precursor production and firing constrains how far apart those two steps can sit, which cuts against a supply chain that has spent years separating them: precursor made in one country, cathode active material fired in another, cells assembled in a third. A chemistry that penalises time in air penalises long precursor supply chains specifically.
There is a second-order consequence for procurement. Buyers of merchant precursor — cathode makers who do not co-precipitate in house — may now want handling and storage provenance written into specifications, not just elemental composition and particle size. Composition tells you what is in the powder. It does not tell you what the powder has been breathing.
The cobalt-free push does not stop, but it gets more expensive
The strategic logic behind high-nickel, cobalt-free cathodes has not changed. Nickel carries energy density, which carries range. Manganese is cheap and abundant and stabilises structure. Cobalt is costly and carries sourcing scrutiny that automakers would rather not manage. Every one of those pressures still points the same direction.
Cobalt is costly and carries sourcing scrutiny that automakers would rather not manage.
What the Hanyang study adjusts is the cost of doing it properly. Part of the case for eliminating cobalt has been input-cost savings. If some of that saving is consumed by inert handling, tighter logistics and additional inspection at the precursor stage, the net advantage narrows — and it narrows most for the smaller producers least able to absorb capital spending on atmosphere control. The likely effect is consolidation of advantage toward integrated players who make precursor and cathode active material on the same site, under one roof, with minutes rather than weeks between steps.
For manganese demand itself, the read is neutral to mildly positive. Nothing in the finding argues for using less manganese; it argues for handling manganese-containing precursor more carefully. Battery-grade manganese sulphate remains a smaller, more specification-sensitive market than the metallurgical manganese that feeds steelmaking, and a result like this reinforces that battery-grade means more than purity — it means process history.
What to watch next
Three things will tell you whether this becomes an industry standard or an academic footnote. First, replication at pilot scale: laboratory precursor exposed under controlled conditions is not the same as tonnes of powder in a warehouse, and the industry will want cycle-life data on production cells. Second, specification language: if major cathode buyers begin writing atmosphere and dwell-time requirements into purchase agreements, the finding has been accepted commercially. Third, capital announcements — new inerting equipment on existing precursor lines is a visible, checkable signal that producers believe the risk is real.
The wider backdrop is a market in which battery quality claims are increasingly the differentiator rather than raw energy density. Warranty terms on EV packs have lengthened, and every year of promised life is a liability priced into an automaker's balance sheet. A degradation mechanism seeded before the cathode even exists is exactly the kind of hidden variable that makes those promises expensive.
Where the market sat
The research arrived against a broadly firm equity backdrop. At the last close on Friday, 21 August 2026, the S&P 500 tracker (NYSEARCA: SPY) finished at $765.72, up 0.41% on the day from a prior close of $762.60, within a session range of $764.17 to $767.85. The Nasdaq 100 proxy (NASDAQ: QQQ) closed at $713.44, up 0.35%, and the Dow 30 fund (NYSEARCA: DIA) closed at $532.22, up 0.89%. Battery-materials news of this kind rarely moves indices; it moves engineering roadmaps and supplier contracts, and those show up in earnings quarters later, not in a day's tape.
Key facts
- Study location: Hanyang University, South Korea
- Mechanism identified: Air exposure of cathode precursor triggers chemical changes that later accelerate degradation
- Chemistry affected: Cobalt-free, high-nickel cathodes including manganese-coated nickel core designs
- Market benchmark: S&P 500 (SPY) closed at $765.72, +0.41%, as of 21 Aug 2026 20:00 GMT
Frequently asked questions
What did the Hanyang University researchers find?
They found that exposing the precursor material used in manganese-coated, high-nickel cathode batteries to air causes subtle chemical changes. Those changes are not obvious immediately but later accelerate battery degradation, which can shorten the usable life of an electric vehicle battery pack even when the initial performance looks normal.
What is a cathode precursor?
A precursor is the co-precipitated metal hydroxide powder — containing nickel, manganese and sometimes cobalt — that is made before a cathode exists. It is later mixed with a lithium source and fired at high temperature to create the active cathode material used in cells. It is an intermediate product, often made at a separate site.
Why is the industry moving to cobalt-free, high-nickel cathodes?
High-nickel cathodes raise energy density, which increases EV driving range, while removing cobalt cuts exposure to an expensive critical mineral with difficult sourcing scrutiny. Manganese is cheap, abundant and helps stabilise structure, making manganese-coated nickel-rich designs an attractive route to range without cobalt.
Does this mean cobalt-free batteries are unsafe or unusable?
No. The research points to a process sensitivity, not a fundamental defect in the chemistry. The issue arises from how precursor powder is stored and handled before firing. Controlled atmosphere handling and shorter dwell times between production steps are the kinds of remedies the finding implies rather than abandoning the chemistry.
How could manufacturers respond to the finding?
Likely responses include blanketing precursor storage and transfer lines with inert gas such as nitrogen or argon, sealing containers, controlling humidity, and shortening the time between precursor production and calcination. Buyers may also start writing handling and storage provenance into purchase specifications alongside composition and particle size.
What does this mean for manganese demand?
The finding does not argue for using less manganese, only for handling manganese-containing precursor more carefully. It reinforces that battery-grade manganese material is defined by process history as well as chemical purity, which tends to favour integrated producers who make precursor and cathode material on the same site.
Sources
Photo: MART PRODUCTION · Pexels Licence — source
