Lithium Carbonate vs Lithium Hydroxide

Two Products, One Reporting Unit

Lithium carbonate and lithium hydroxide are two products made from one element. They tend to start from different raw materials, go into different battery cathodes and trade on separate price assessments. Producers still report both in a single unit, lithium carbonate equivalent (LCE), so one company’s volume or realised price compares with another’s only after every tonne has been converted. Skip the conversion and a hydroxide producer’s volume reads 13.6% larger than the lithium it actually sold.

Lithium carbonate (Li₂CO₃) is a salt. Battery-grade lithium hydroxide is sold as the monohydrate, LiOH·H₂O, a crystal carrying one water molecule for each lithium atom. Both also come in technical grade for glass, ceramics and greases, but batteries took 88% of global lithium use in 2025 on the US Geological Survey’s estimate. The specialty vs commodity guide covers why a company selling them behaves more like a commodity producer than a formulator.

Carbonate and Hydroxide Side by Side

Lithium content and LCE factors computed from the standard atomic weights of IUPAC, the international chemistry standards body, with the arithmetic below. The USGS Mineral Commodity Summaries 2026 lists separate price series for battery-grade carbonate (spot in China, and a contract series), for hydroxide (spot in China) and for spodumene concentrate at 6% lithium oxide (Australia).

The Cathode Decides Which One Is Wanted

A battery maker picks the lithium compound to suit the cathode it makes. High-nickel cathodes, meaning nickel-manganese-cobalt blends from NMC622 upwards and nickel-cobalt-aluminium (NCA), are made with hydroxide. LFP and lithium cobalt oxide are made with carbonate. The International Energy Agency (IEA), in its 2021 report on critical minerals, and Albemarle, in its product note of October 2025, draw the same line.

So demand for each product follows the battery mix, and the mix has moved a long way. LFP went from under 10% of the global electric car battery market in 2020 to nearly half in 2024, on the IEA’s count by battery capacity. In China it met nearly three-quarters of domestic battery demand; in the United States it stayed below 10%, and in the EU it passed 10%. A producer’s split between hydroxide and carbonate therefore decides which cathode makers it can sell to, and in which regions.

Brine and Rock: Where Each Starts

Brine producers pump lithium-bearing salt water into ponds and let the sun concentrate it. At Albemarle’s Salar de Atacama operation in Chile the evaporation takes 18 to 24 months, and the concentrated brine is processed into lithium carbonate and lithium chloride at La Negra nearby. Hard-rock producers mine spodumene, a lithium-bearing mineral, and upgrade it to a concentrate, benchmarked at 6% lithium oxide (Li₂O). A conversion plant then turns that concentrate into a lithium chemical.

Albemarle’s network shows the pattern and its exceptions. Concentrate from its Greenbushes and Wodgina mines in Western Australia goes to conversion plants in Australia and China that make hydroxide, though one Chinese plant, Qinzhou, makes both products. Its Silver Peak brine operation in Nevada makes technical-grade carbonate and hydroxide. Brine tends to end as carbonate; rock can end as either.

Lithium Carbonate Equivalent, and How to Convert

LCE is the tonnage of lithium carbonate that would contain the same lithium. It counts lithium atoms and weighs them as carbonate. Every factor is a ratio of molar masses, computed from IUPAC’s abridged standard atomic weights: lithium 6.94, carbon 12.011, oxygen 15.999 and hydrogen 1.0080.

Carbonate and oxide hold two lithium atoms per formula unit, while hydroxide and the metal hold one, which is why the hydroxide rows use half the carbonate mass. The concentrate figure assumes the plant recovers all the lithium; real plants recover less.

The factors are chemistry, so filers agree on them. Albemarle’s 10-K reports mine output in tonnes of lithium metal and gives the conversion as 0.1878 tonne of lithium metal per tonne of LCE, the inverse of 5.323. Its attributable production of 42 thousand tonnes of lithium metal in FY2025 is about 224 thousand tonnes of LCE. The USGS publishes world figures in lithium content: 290,000 tonnes of mine production outside the United States in 2025, or 1.54 million tonnes of LCE. Three unit errors recur:

• Adding hydroxide tonnes to carbonate tonnes. Counting a tonne of monohydrate as a full tonne of LCE overstates the lithium.
• Applying the anhydrous factor to monohydrate. 1.543 against 0.880 overstates by 75%.
• Treating concentrate tonnes as lithium. It takes about 6.7 tonnes of 6% concentrate to make one tonne of LCE before any plant losses.

Worked Example: One Producer, Two Products

Take a fictional producer that sold 40,000 tonnes of lithium hydroxide monohydrate and 30,000 tonnes of lithium carbonate in a year, for $800M of revenue.

Divide $800M by 65.2 million kilograms and the realised price is $12.27 per kilogram of LCE. Add the product tonnes instead and volume reads 70.0 thousand tonnes, 7.4% too high, while the price falls to $11.43, 6.9% too low. Revenue is unchanged, but every per-kilogram figure a model runs on is wrong: price, cash cost and margin.

A concentrate line converts the same way. If the producer also sold 100,000 tonnes of 6% concentrate, that adds 14.8 thousand tonnes of LCE, and a blended realised price that includes it drops, because concentrate earns less per kilogram of contained lithium than a finished chemical.

Realised Price vs Index Price

A realised price is what a producer collected: segment sales divided by volume in LCE. A market price is an assessment of what traded. Albemarle publishes both. Its Q4 2025 earnings presentation gives the FY2025 average realised price of its Energy Storage segment as $11.50 per kilogram of LCE, counting salts (its word for lithium chemicals such as carbonate and hydroxide) and spodumene by contained lithium. The same slide prints an observed market average of $10 per kilogram, a blend of spot and regional indices. Three things separate the two numbers.

Contract terms. Albemarle sells partly under index-referenced and variable-priced contracts, which its 10-K says keep the business generally aligned with market pricing. Its February 2026 outlook assumes about 40% of 2026 salts volume on long-term agreements with price floors. A floor holds a realised price above the index whenever the index sits below it.

Timing. A contract priced on an index averaged over a past month or quarter settles after the market has moved, so realised prices trail the index in both directions.

Mix. Concentrate counted by its contained LCE sells for less per kilogram of lithium than a converted salt, and Albemarle’s slide says spodumene sales pull its blended price below the market figure in its scenarios. Carbonate and hydroxide are assessed separately too, and the 10-K notes that purity and performance move the price.

Hydroxide and carbonate are priced on different assessments, so a producer’s realised price per kilogram of LCE moves with its product mix as well as with the market.