XYCLE INCLUDED IN VERDANTIX SMART INNOVATORS 2025

Read the report

Whitepaper

Nickel's Carbon Footprint: Why Source and Production Route Matter

Nickel's Carbon Footprint: Why Source and Production Route Matter

The same battery-grade nickel can carry very different carbon footprints depending on its ore type, processing route and energy source. This guide explains why, drawing on Minviro's life cycle assessment of six nickel sulfate production routes.

The same battery-grade nickel can carry very different carbon footprints depending on its ore type, processing route and energy source. This guide explains why, drawing on Minviro's life cycle assessment of six nickel sulfate production routes.

The same battery-grade nickel can carry very different carbon footprints depending on its ore type, processing route and energy source. This guide explains why, drawing on Minviro's life cycle assessment of six nickel sulfate production routes.

Lyle Trytten

Robert Pell

Robert Pell

Rohin Shah

Rohin Shah

Lyle Trytten

Robert Pell

Robert Pell

Rohin Shah

Rohin Shah

IN SUMMARY

Understanding the relationship between nickel source and carbon intensity

Understanding the relationship between nickel source and carbon intensity

Nickel is a cornerstone of the battery supply chain, and demand is rising as cathode chemistries shift toward higher nickel content. But "nickel" is not a single product with a single carbon number. The same battery-grade material, nickel sulfate hexahydrate, can be produced through several routes, each with its own resources, energy sources and chemistry. Minviro's white paper measures this variability and explains why knowing the source and production route is essential to understanding a supply chain's true climate change impact.

Nickel is a cornerstone of the battery supply chain, and demand is rising as cathode chemistries shift toward higher nickel content. But "nickel" is not a single product with a single carbon number. The same battery-grade material, nickel sulfate hexahydrate, can be produced through several routes, each with its own resources, energy sources and chemistry. Minviro's white paper measures this variability and explains why knowing the source and production route is essential to understanding a supply chain's true climate change impact.

Nickel is a cornerstone of the battery supply chain, and demand is rising as cathode chemistries shift toward higher nickel content. But "nickel" is not a single product with a single carbon number. The same battery-grade material, nickel sulfate hexahydrate, can be produced through several routes, each with its own resources, energy sources and chemistry. Minviro's white paper measures this variability and explains why knowing the source and production route is essential to understanding a supply chain's true climate change impact.

  • Carbon intensity varies widely. Across the modelled routes and transport scenarios, nickel entering the battery value chain ranges from roughly 5 to 105 kg CO₂e per kg nickel.

  • Carbon intensity varies widely. Across the modelled routes and transport scenarios, nickel entering the battery value chain ranges from roughly 5 to 105 kg CO₂e per kg nickel.

  • Carbon intensity varies widely. Across the modelled routes and transport scenarios, nickel entering the battery value chain ranges from roughly 5 to 105 kg CO₂e per kg nickel.

  • Route matters more than ore type alone. Laterite nickel via HPAL can carry a lower footprint than sulfide nickel via pyrometallurgy, depending on energy source and resource characteristics.

  • Route matters more than ore type alone. Laterite nickel via HPAL can carry a lower footprint than sulfide nickel via pyrometallurgy, depending on energy source and resource characteristics.

  • Route matters more than ore type alone. Laterite nickel via HPAL can carry a lower footprint than sulfide nickel via pyrometallurgy, depending on energy source and resource characteristics.

  • Averages hide the real picture. Up to a third of the total impact can be missed if only Scope 1 and Scope 2 emissions are counted, which is why full LCA is necessary rather than optional.

  • Averages hide the real picture. Up to a third of the total impact can be missed if only Scope 1 and Scope 2 emissions are counted, which is why full LCA is necessary rather than optional.

  • Averages hide the real picture. Up to a third of the total impact can be missed if only Scope 1 and Scope 2 emissions are counted, which is why full LCA is necessary rather than optional.

Two ore types, many routes to the same product

Refined nickel is generally split into Class I (nominally pure nickel metal) and Class II products, with a range of intermediates in between. All of these can be converted to nickel sulfate hexahydrate, the battery industry's feedstock of choice, and the route taken depends first on geology. Sulfide ores carry nickel grades from 0.25% up to 4% and are usually concentrated by flotation, then treated pyrometallurgically through smelting and conversion to nickel matte. Laterite ores are surface deposits split into limonite and saprolite: saprolite is processed pyrometallurgically into ferronickel or nickel pig iron, while limonite is leached under high pressure and temperature with sulfuric acid (HPAL) to recover nickel and cobalt. In 2019, laterites supplied roughly 70% of global nickel and sulfides 30%, and the laterite share is expected to grow, led by new Indonesian capacity.

Refined nickel is generally split into Class I (nominally pure nickel metal) and Class II products, with a range of intermediates in between. All of these can be converted to nickel sulfate hexahydrate, the battery industry's feedstock of choice, and the route taken depends first on geology. Sulfide ores carry nickel grades from 0.25% up to 4% and are usually concentrated by flotation, then treated pyrometallurgically through smelting and conversion to nickel matte. Laterite ores are surface deposits split into limonite and saprolite: saprolite is processed pyrometallurgically into ferronickel or nickel pig iron, while limonite is leached under high pressure and temperature with sulfuric acid (HPAL) to recover nickel and cobalt. In 2019, laterites supplied roughly 70% of global nickel and sulfides 30%, and the laterite share is expected to grow, led by new Indonesian capacity.

Measuring impact with life cycle assessment

Life cycle assessment (LCA) captures this complexity. It quantifies direct process emissions alongside the embodied impacts of energy, chemicals, raw materials and transport, and that embodied portion matters most for reagent- and energy-intensive routes, where ignoring it would understate the true footprint. For Nickel's Carbon Challenge, our team modelled six production routes across three technologies, covering best and worst cases for each: sulfide via pyrometallurgy, laterite via HPAL, and laterite via RKEF. The system boundary is cradle to plant gate, with a functional unit of one kilogram of battery-grade nickel sulfate hexahydrate at 22% nickel. Background data came from Ecoinvent 3.9.1, using the Environmental Footprint 3.0 method.

Life cycle assessment (LCA) captures this complexity. It quantifies direct process emissions alongside the embodied impacts of energy, chemicals, raw materials and transport, and that embodied portion matters most for reagent- and energy-intensive routes, where ignoring it would understate the true footprint. For Nickel's Carbon Challenge, our team modelled six production routes across three technologies, covering best and worst cases for each: sulfide via pyrometallurgy, laterite via HPAL, and laterite via RKEF. The system boundary is cradle to plant gate, with a functional unit of one kilogram of battery-grade nickel sulfate hexahydrate at 22% nickel. Background data came from Ecoinvent 3.9.1, using the Environmental Footprint 3.0 method.

What the results show

The headline finding is a wide spread in climate change impact per kilogram of nickel. Sulfide resources tend to deliver the lowest-carbon product and laterites generally sit higher, which aligns with the broader literature. But the route matters more than the ore type alone: laterite nickel via HPAL can carry a lower footprint than sulfide nickel via pyrometallurgy, depending on energy source and resource characteristics. Across all routes and transport scenarios, the carbon intensity of nickel entering the battery value chain is likely to range between 5 and 105 kg CO₂e per kg nickel. Splitting the results by scope reveals a further point: up to a third of the total impact can be missed if only Scope 1 and Scope 2 emissions are counted. For reagent-heavy hydrometallurgical routes such as best-case HPAL, Scope 3 makes up around a third of the footprint.

The headline finding is a wide spread in climate change impact per kilogram of nickel. Sulfide resources tend to deliver the lowest-carbon product and laterites generally sit higher, which aligns with the broader literature. But the route matters more than the ore type alone: laterite nickel via HPAL can carry a lower footprint than sulfide nickel via pyrometallurgy, depending on energy source and resource characteristics. Across all routes and transport scenarios, the carbon intensity of nickel entering the battery value chain is likely to range between 5 and 105 kg CO₂e per kg nickel. Splitting the results by scope reveals a further point: up to a third of the total impact can be missed if only Scope 1 and Scope 2 emissions are counted. For reagent-heavy hydrometallurgical routes such as best-case HPAL, Scope 3 makes up around a third of the footprint.

Why averages fall short

For nickel buyers and producers, the practical message is that an industry-average figure cannot stand in for a specific supply chain. Process technology, resource grade and energy source combine differently for every operation, so two suppliers selling the same nickel sulfate can carry very different carbon footprints. This will matter commercially as well as environmentally. The EU Battery Regulation is expected to embed carbon footprint requirements and, eventually, thresholds, which means batteries carrying high embodied nickel emissions could face restricted access to the European market. That would raise demand and price for lower-carbon nickel, making the source of your nickel a competitive question as much as a sustainability one.

For nickel buyers and producers, the practical message is that an industry-average figure cannot stand in for a specific supply chain. Process technology, resource grade and energy source combine differently for every operation, so two suppliers selling the same nickel sulfate can carry very different carbon footprints. This will matter commercially as well as environmentally. The EU Battery Regulation is expected to embed carbon footprint requirements and, eventually, thresholds, which means batteries carrying high embodied nickel emissions could face restricted access to the European market. That would raise demand and price for lower-carbon nickel, making the source of your nickel a competitive question as much as a sustainability one.

Know the carbon footprint of your nickel supply chain

FAQ

Curious to learn more?

Let us support you on the journey.

Let us support you on the journey.

Reach out anytime. We’re happy to answer any questions before you commit to working together.

Anna Broughton

Strategic Accounts Manager at Minviro

authors

The team behind your insights

Lyle Trytten

External Consultant

Lyle Trytten is an expert engineering consultant with a deep knowledge of the nickel sector.

Connect

Robert Pell

Robert Pell

Founder & CEO

Robert Pell is the Founder and CEO of Minviro. His doctoral research at the University of Exeter's Camborne School of Mines focused on responsible sourcing of rare earth elements, pioneering novel Life Cycle Assessment approaches and developing methodology for integrating LCA into mine planning. A published scientist and experienced speaker, Robert holds roles as Chair of the Rare Earth Industry Association (REIA) and the Critical Minerals Association (CMA).

Connect

Rohin Shah

Rohin Shah

Technical Product Manager

Rohin Shah is a technical expert on LCA having previously worked as a consultant and now focuses on product development with XYCLE.

Connect

Lyle Trytten

External Consultant

Lyle Trytten is an expert engineering consultant with a deep knowledge of the nickel sector.

Connect

Robert Pell

Robert Pell

Founder & CEO

Robert Pell is the Founder and CEO of Minviro. His doctoral research at the University of Exeter's Camborne School of Mines focused on responsible sourcing of rare earth elements, pioneering novel Life Cycle Assessment approaches and developing methodology for integrating LCA into mine planning. A published scientist and experienced speaker, Robert holds roles as Chair of the Rare Earth Industry Association (REIA) and the Critical Minerals Association (CMA).

Connect

Rohin Shah

Rohin Shah

Technical Product Manager

Rohin Shah is a technical expert on LCA having previously worked as a consultant and now focuses on product development with XYCLE.

Connect

Whitepaper

Don't miss these

Whitepaper

Label

Supplier Data Collection Guide for LCA

Title

→

Whitepaper

Label

Indonesia's Steelmaking Carbon Footprint: The Case for Low-Carbon Steel

Title

→

Whitepaper

Label

The Sustainability of Nickel Mining in ASEAN: Supply, Depletion and Carbon Footprint

Title

→

Label

Title

→

Label

Title

→

Whitepaper

Don't miss these

Label

Title

→

Label

Title

→

Label

Title

→

LCA with Minviro

The foundation for
all our work

The foundation for all our work

Our data focuses on materials and processes where environmental performance varies sharply by route, geography, and technology, exactly where industry averages fall apart. Choose individual routes from across the critical minerals, battery, magnet, and heavy-industry value chains. Each one lands in XYCLE as a working model: open the unit processes, see where the impact sits, test a different supplier or energy grid, and watch the number move, defensible enough for a regulatory filing, transparent enough to act on.

read more

300+

projects across leading OEMs and product portfolios

46+

countries and regional data covered through our work

3

global offices in London, Perth and Shanghai