What is “black mass”, and why is it such a significant opportunity for cobalt supply?

Black mass is the black, powder-like material produced when lithium-ion cells are stabilised and then shredded or crushed. It concentrates the most valuable battery metals, particularly those in the cathode, including cobalt alongside nickel, manganese and lithium. Because cobalt supply is highly exposed to geopolitical and ethical risks and prices have been extremely volatile, black mass is increasingly viewed as a strategic secondary feedstock for battery manufacturers. Recovering cobalt domestically from end-of-life batteries can reduce reliance on mined material and improve supply resilience. The opportunity is growing as EV and electronics battery volumes rise, with demand for cobalt exceeding 200kt in 2024 and forecast to keep increasing.

Which battery chemistries contain the most cobalt, and how does chemistry affect recycling economics?

Chemistry determines both cobalt content and the commercial value of recycling. Most cobalt sits in the cathode as lithium metal oxides. LCO batteries, common in higher-end phones and laptops, are typically the most cobalt-rich feedstock, with cobalt representing around 24% of battery weight, making them highly attractive from a cobalt perspective even though they are physically small. EV batteries are often NMC, where cobalt content varies by grade, such as around 20% in NMC 532 and NMC 622, and closer to 10% in NMC 811. Newer variants like NMC 955 reduce cobalt further. Because revenue depends on the contained metals, cobalt- and nickel-bearing chemistries usually recycle better financially than LFP, which contains neither.

How is cobalt actually recovered from black mass, and why is hydrometallurgy often preferred?

Cobalt recovery typically starts after packs are collected, sorted by chemistry to avoid cross-contamination, and disassembled into modules and cells. Cells are stabilised and comminuted into black mass, then processed using hydrometallurgy, which uses leaching and targeted separation steps to achieve high selectivity and purity. The process commonly begins with mineral acid leaching, followed by staged impurity removal to take out materials such as copper, iron and aluminium. Solvent extraction is then used to separate metals that behave similarly, enabling distinct streams for manganese, cobalt and nickel. Lithium is often recovered at the end as lithium carbonate. Compared with pyrometallurgy, hydrometallurgy generally avoids losing lithium and manganese to slag and reduces downstream refining to reach battery-grade outputs.

What are the biggest operational barriers to scaling cobalt recovery from end-of-life batteries?

The main constraint is not the extraction technology but reliable, safe and economical collection. Collection networks remain fragmented, and overall lithium-ion recycling rates are still under 10% despite large projected end-of-life volumes. Safety and logistics add substantial cost because damaged or “unknown state” batteries carry thermal runaway risk and must be treated as hazardous goods, requiring specialist ADR-compliant transport and UN-certified containers. Recycling sites also need separate procedures for damaged defective packs, which cannot be shredded like intact batteries due to residual charge and instability. Consumer electronics add another challenge: while often cobalt-rich, they are small and dispersed, so the cost of aggregating, transporting and processing many low-weight units can exceed the recovered value without robust infrastructure or support.

How do policy and incentives influence the business case for urban mining cobalt from batteries?

Policy is critical because it shapes collection volumes, compliance obligations and minimum demand for recycled content. The EU’s Extended Producer Responsibility framework pushes manufacturers and importers to fund and manage end-of-life batteries, while the revised Battery Regulation introduces rising recycled-content requirements, including cobalt, which strengthens long-term offtake and investment confidence. China is tightening control through vehicle-battery co-retirement rules and national traceability, again improving capture rates. The US supports domestic sourcing through clean vehicle credits tied to North American or partner-country extraction, processing and recycling, but lacks a single nationwide EPR-style system. Incentives may need to remain flexible because profitability varies by chemistry and commodity prices; for low-value chemistries like LFP, mechanisms such as gate fees or price floors for black mass may be needed to keep recycling viable.

Mining Technology

Ucore, SCOA sign deal for North American rare earth supply chain

The agreement covers sourcing rare earth feedstock for the Louisiana SMC and creating downstream offtake for separated products.

Ucore Rare Metals and the Sumitomo Corporation of Americas (SCOA) have signed a strategic cooperation framework to develop a diversified rare earth supply chain in North America and allied markets.

Signed on 10 June 2026, the agreement outlines joint efforts in sourcing rare earth feedstock for Ucore’s Louisiana Strategic Metals Complex (SMC) and developing downstream offtake opportunities for separated rare earth products.

The scope of the collaboration covers selected middle and heavy rare earth elements (MREEs and HREEs), which are essential for high-performance magnets and advanced materials, particularly for industrial uses in Japan.

The arrangement is also intended to preserve rare earth feedstock for further processing for other North American and allied markets.

Ucore aims to integrate its RapidSX technology platform at its Louisiana SMC refinery with SCOA’s global sourcing, logistics and Japanese market access to strengthen the regional rare earth supply network.

The companies plan to formally cooperate in Ucore’s Global Partnership Initiative, which was previously announced as a joint initiative with the Government of Canada.

SCOA will act as Ucore’s distribution partner for certain separated rare earth materials to selected Japanese customers and other agreed industrial applications.

The companies also plan to evaluate cooperative opportunities across the rare earth supply chain, subject to commercial terms and existing business relationships.

Ucore is progressing with its rare earth processing operations in North America, including the planned Louisiana SMC and related demonstration projects supported by the Government of Canada.

In the long term, the company aims to develop its Bokan-Dotson Ridge heavy rare earth project on Prince of Wales Island in south-east Alaska, US.

SCOA has established experience in rare earth sourcing, trading and supply chain activities globally.