Technology
The second step is heat. Precursor is blended with a lithium compound and fired for hours in a controlled atmosphere, which drives the lithium into the particle and forms the crystal structure that stores it. What comes out is milled, surface-treated and graded, and it is the single most expensive material in a nickel-based cell.
In one sentence
Cathode active material is the finished powder coated onto a cell's positive electrode, produced by blending precursor with a lithium compound, calcining it, and then milling, surface-coating and classifying the result.
Precursor and lithium carbonate or hydroxide are blended and loaded into ceramic saggars that pass slowly through a roller-hearth kiln. High-nickel materials are fired in oxygen rather than air and at lower temperatures for longer, because the structure they need is harder to form and easier to spoil. The fired cake is then crushed, milled, sieved, washed to remove residual lithium from the surface, coated with a thin oxide layer and classified by particle size.
Iron-phosphate cathode is a different industry using the same word. It is made from an iron phosphate or iron and phosphoric acid feed with a lithium source and a carbon coating, fired in an inert atmosphere, and it is produced by a largely separate set of companies at a fraction of the cost per kilogram. A plant built for one route does not make the other.
Output is set by how much material passes through the kilns, and firing high-nickel material takes longer and consumes oxygen, so the same building produces less of it. Saggars are consumables that degrade with every pass and contaminate the product as they do. Kiln count, kiln length and saggar consumption are therefore the real capacity and cost figures behind a cathode plant, not its nameplate tonnage.
Residual lithium compounds left on the particle surface cause gassing and swelling in the cell, so high-nickel material is washed and then coated with a thin layer of alumina or a boron compound to stabilise the interface with the electrolyte. Doping with aluminium, magnesium or zirconium stabilises the bulk. These are the steps that separate materials with identical nominal compositions.
Conventional material is a sphere of many small crystallites, which offers surface area but cracks along the boundaries as it expands and contracts. Single-crystal material is fired harder to grow larger individual particles that survive far longer but accept charge more slowly and need a different electrode design. The choice is made per cell programme and it changes the firing schedule, not merely the specification.
2 of these are marked as a chokepoint: a handful of qualified suppliers, a multi-year lead time, or a single geography.
The particle arrives already formed, so its composition and structure are fixed before this plant sees it.
Precursor materialsHydroxide is required for high-nickel materials because they fire at lower temperatures, and carbonate suits iron-phosphate and lower-nickel routes. The two are not interchangeable.
LithiumFiring is a long, energy-intensive step in a controlled atmosphere, and adding capacity means adding kilns and the building around them rather than running the existing ones harder.
What each company supplies at this step, and — where a public figure exists — its share of this specific market — with what that share measures, the period it covers and who published it. Some rows also show the company’s own reported revenue for the segment covering this step, which is a different thing: it says how much this business matters to that company, not how much of the market it holds. Not a ranking and not a recommendation.
Produces nickel-rich cathode active material at scale for Korean cell manufacturers.
Supplies high-nickel cathode powder to Chinese and Korean cell makers.
Supplies cathode material across both the nickel-rich and iron-phosphate families.
Produces cathode active material within an integrated chain from refining onwards.
Produces cathode material for the Japanese cell lines and refines the nickel behind it.
Produces cathode material in Europe and Asia, and recycles into the same chain.
Supplies cathode material to Japanese cell lines, from the company that also holds much of the phosphor business.
Supplies high-nickel cathode material, largely to a single very large customer.
The largest maker of iron-phosphate cathode powder, a route with its own producers and economics.
Whether single-crystal material becomes the default for high-nickel cells rather than a premium option.
Whether cathode capacity outside Asia reaches a scale that supports local cell production.
Whether manganese-rich chemistries move into production and change which plants are useful.
Each page explains one technology in plain language, states what it depends on, and names companies by what they supply at that step. Company roles are described qualitatively and deliberately carry no market shares, revenue figures or rankings — those change faster than an explainer can, and a stale number is worse than none. Ticker links point at company pages on this site and are provided for reference only.
Nothing here is investment advice, a recommendation, or a forecast. A company named on a page about a technology is not thereby a good investment, and the chokepoints described are structural facts about supply chains rather than predictions about prices. Technology moves; where a page describes something as unresolved or in development, that was true when it was written.