As battery recycling scales across Europe, attention is shifting from simply collecting end-of-life batteries to recovering high-quality materials that can be reused in new production. At the centre of this process is “black mass”, the crushed mixture of valuable battery materials extracted during recycling.
Black mass contains critical raw materials such as lithium, cobalt, nickel and manganese. Its quality directly affects how efficiently these materials can be recovered and reintegrated into the battery value chain.
With the introduction of the Digital Battery Passport under Regulation (EU) 2023/1542, there is a growing opportunity to bring traceability, transparency and quality assurance into this stage of the lifecycle.
What is Black Mass?
Black mass is produced when batteries are mechanically or chemically processed at end-of-life. After dismantling and shredding, the active materials from battery cells are separated into a fine powder. This powder contains the metals that recyclers aim to recover.
The quality of black mass can vary significantly depending on the source batteries, their chemistry, their state of degradation and the recycling process used. Contamination, inconsistent composition and unknown material origins can all reduce recovery efficiency.
Improving recycling efficiency and material recovery is essential for securing a long-term supply of critical battery materials and reducing reliance on primary extraction. Without reliable information on input materials, recyclers often operate under uncertainty, which can affect both process optimisation and final output quality.
Traceability Challenges in Black Mass
Once batteries are shredded and processed into black mass, their original identity is effectively lost. Materials from different sources are often mixed, making it difficult to trace the origin of specific elements.
This creates several challenges. Recyclers may not know the exact composition of incoming material, which complicates processing. Manufacturers may struggle to verify the quality and origin of recycled materials. Regulators may find it difficult to assess compliance with recycling targets and sustainability requirements.
The European Commission has also emphasised the importance of traceability in supporting circular economy goals and ensuring responsible material use.
To address this, the industry must move towards systems that preserve data continuity even when physical traceability becomes challenging.
How the Digital Battery Passport Supports Black Mass Traceability
The Digital Battery Passport introduces a structured and interoperable framework for linking data to each battery throughout its lifecycle. This includes information on composition, manufacturing, performance and end-of-life handling.
Under Regulation (EU) 2023/1542, batteries placed on the EU market must include accessible, machine-readable information on composition, performance and lifecycle events.
When applied to recycling, this data can act as a bridge between original batteries and the resulting black mass. While physical identity is lost during shredding, digital records allow key attributes such as chemistry, material composition and degradation history to remain accessible.
In practice, this does not imply perfect one-to-one traceability after mixing. Instead, approaches such as batch-level tracking and mass balance accounting can be used. These methods will help recyclers to estimate the composition of black mass based on known inputs and processing flows. By combining passport data with operational data from recycling facilities, a more accurate picture of material quality can be constructed.
Improving Black Mass Quality Through Data
Access to reliable lifecycle data can significantly improve the quality and consistency of black mass.
If recyclers know the chemistry and condition of incoming batteries, they can optimise pre-treatment and separation processes. This reduces contamination and improves the purity of recovered materials.
Manufacturers can also benefit. When recycled materials are reintroduced into production, passport data can help verify their origin and composition. This supports quality control and builds trust in secondary raw materials.
Over time, this creates a more stable and predictable supply of recycled materials, which is essential for scaling battery production sustainably.
Enabling Closed-Loop Material Flows
One of the key goals of the EU Battery Regulation is to promote closed-loop recycling, where materials from end-of-life batteries are reused in new batteries.
To achieve this, it is necessary to track materials across multiple lifecycle stages. The Digital Battery Passport enables this by linking data from manufacturing, use and recycling.
When black mass is processed and refined, its outputs can be associated with the original data records. This helps create a continuous chain of information that supports circularity.
Such traceability is critical for meeting recycled-content requirements and ensuring that materials comply with regulatory standards.
Supporting Compliance and Market Transparency
The EU Battery Regulation sets specific targets for material recovery and recycled content. Demonstrating compliance with these requirements depends on accurate and verifiable data.
By integrating recycling data into the Digital Battery Passport, stakeholders can provide evidence of how materials have been processed and reused. This improves transparency for regulators and builds confidence across the market.
It also helps prevent issues such as misreporting or greenwashing, where claims about recycled content cannot be verified.
Challenges in Tracking Black Mass
Despite its potential, implementing black mass traceability requires careful system design. Once materials are mixed, traceability becomes probabilistic rather than absolute. Robust data models and mass balance methodologies are needed to maintain meaningful links between inputs and outputs.
Data integration across stakeholders remains a challenge. Recycling involves multiple actors, each with different systems and data standards. Ensuring interoperability is essential for effective traceability.
There are also considerations around data governance. Sensitive information must be protected while still enabling transparency. Clear rules on access, ownership and usage are required to balance these priorities.
How BASE Enables Traceability Across the Recycling Chain
At BASE, we recognise that achieving circularity requires more than end-of-life processing. It depends on maintaining data continuity from production through to recycling and material recovery.
Our Digital Battery Passport framework is designed to support structured data capture and secure data exchange across the battery lifecycle. This includes the ability to link information from original batteries to recycling outputs such as black mass.
By enabling interoperable data models and controlled access, BASE helps stakeholders trace material quality, verify origins and improve recycling efficiency. This supports both regulatory compliance and the development of reliable secondary material markets.
Looking Ahead
As battery recycling continues to scale, black mass will become an increasingly strategic resource. Its value will depend not only on the materials it contains, but also on the reliability of the data that describes it.
Digital Battery Passports provide the infrastructure needed to connect lifecycle information with recycling outputs. By enabling traceability, supporting quality verification and improving process efficiency, they help transform black mass from an uncertain by-product into a verified and trusted input for new battery production.
Organisations that invest in data-driven recycling and traceability systems today will be better positioned to meet regulatory requirements, secure material supply and lead the transition towards a truly circular battery economy.
The BASE project has received funding from the Horizon Europe Framework Programme (HORIZON) Research and Innovation Actions under grant agreement No. 101157200.
References
EU Battery Regulation (Regulation EU 2023/1542): https://eur-lex.europa.eu/eli/reg/2023/1542/oj
EU Battery Regulation Detailed Text: https://eur-lex.europa.eu/eli/reg/2023/1542/2023-07-28/eng
International Energy Agency – Global EV Outlook 2023: https://www.iea.org/reports/global-ev-outlook-2023
European Commission – Circular Economy Overview: https://environment.ec.europa.eu/topics/circular-economy_en