How Clean is the Nickel and Lithium in a Battery?

The production of lithium (Li) and nickel (Ni), two key raw materials for batteries, can produce vastly different emissions profiles.

This graphic from Wood Mackenzie shows how nickel and lithium mining can significantly impact the environment, depending on the processes used for extraction.

Nickel Emissions Per Extraction Process

Nickel is a crucial metal in modern infrastructure and technology, with major uses in stainless steel and alloys. Nickel’s electrical conductivity also makes it ideal for facilitating current flow within battery cells.

Today, there are two major methods of nickel mining:

• From laterite deposits, which are predominantly found in tropical regions. This involves open-pit mining, where large amounts of soil and overburden need to be removed to access the nickel-rich ore.

• From sulphide ores, which involves underground or open-pit mining of ore deposits containing nickel sulphide minerals.

Although nickel laterites make up 70% of the world’s nickel reserves, magmatic sulphide deposits produced 60% of the world’s nickel over the last 60 years.

Compared to laterite extraction, sulphide mining typically emits fewer tonnes of CO2 per tonne of nickel equivalent as it involves less soil disturbance and has a smaller physical footprint:

Nickel extraction from laterites can impose significant environmental impacts, such as deforestation, habitat destruction, and soil erosion.

Additionally, laterite ores often contain high levels of moisture, requiring energy-intensive drying processes to prepare them for further extraction. After extraction, the smelting of laterites requires a significant amount of energy, which is largely sourced from fossil fuels.

Although sulphide mining is cleaner, it poses other environmental challenges. The extraction and processing of sulphide ores can release sulphur compounds and heavy metals into the environment, potentially leading to acid mine drainage and contamination of water sources if not managed properly.

In addition, nickel sulphides are typically more expensive to mine due to their hard rock nature.

Lithium Emissions Per Extraction Process

Lithium is the major ingredient in rechargeable batteries found in phones, hybrid cars, electric bikes, and grid-scale storage systems. 

Today, there are two major methods of lithium extraction:

• From brine, pumping lithium-rich brine from underground aquifers into evaporation ponds, where solar energy evaporates the water and concentrates the lithium content. The concentrated brine is then further processed to extract lithium carbonate or hydroxide.

• Hard rock mining, or extracting lithium from mineral ores (primarily spodumene) found in pegmatite deposits. Australia, the world’s leading producer of lithium (46.9%), extracts lithium directly from hard rock.

Brine extraction is typically employed in countries with salt flats, such as Chile, Argentina, and China. It is generally considered a lower-cost method, but it can have environmental impacts such as water usage, potential contamination of local water sources, and alteration of ecosystems.

The process, however, emits fewer tonnes of CO2 per tonne of lithium-carbonate-equivalent (LCE) than mining:

Mining involves drilling, blasting, and crushing the ore, followed by flotation to separate lithium-bearing minerals from other minerals. This type of extraction can have environmental impacts such as land disturbance, energy consumption, and the generation of waste rock and tailings.

Sustainable Production of Lithium and Nickel

Environmentally responsible practices in the extraction and processing of nickel and lithium are essential to ensure the sustainability of the battery supply chain.

This includes implementing stringent environmental regulations, promoting energy efficiency, reducing water consumption, and exploring cleaner technologies. Continued research and development efforts focused on improving extraction methods and minimizing environmental impacts are crucial.

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Visualizing the World’s Largest Lithium Producers in 2022

Lithium has become essential in recent years, primarily due to the boom in electric vehicles and other clean technologies that rely on lithium batteries.

The global lithium-ion battery market was valued at $52 billion in 2022 and is expected to reach $194 billion in 2030.

The infographic above uses data from the United States Geological Survey to explore the world’s largest lithium producing countries.

Australia and Chile: Dominating Global Lithium Supply

Australia and Chile stand out as the top producers of lithium, accounting for almost 77% of the global production in 2022.

*U.S. production data was withheld to avoid disclosing proprietary company data

Australia, the world’s leading producer, extracts lithium directly from hard rock mines, specifically the mineral spodumene.

Chile, along with Argentina, China, and other top producers, extracts lithium from brine.

Hard rock provides greater flexibility as lithium hosted in spodumene can be processed into either lithium hydroxide or lithium carbonate. It also offers faster processing and higher quality as spodumene typically contains higher lithium content.

Extracting lithium from brine, on the other hand, offers the advantage of lower production costs and a smaller impact on the environment. The following visual from Benchmark Minerals helps break down the carbon impact of different types of lithium extraction.

With that said, brine extraction can also face challenges related to water availability and environmental impacts on local ecosystems.

Historical Shifts in the Lithium Supply Chain

In the 1990s, the United States held the title of the largest lithium producer, producing over one-third of the global production in 1995.

However, Chile eventually overtook the U.S., experiencing a production boom in the Salar de Atacama, one of the world’s richest lithium brine deposits. Since then, Australia’s lithium production has also skyrocketed, now accounting for 47% of the world’s lithium production.

China, the world’s third-largest producer, not only focuses on developing domestic mines but has also strategically acquired approximately $5.6 billion worth of lithium assets in countries like Chile, Canada, and Australia over the past decade.

Furthermore, China currently hosts nearly 60% of the world’s lithium refining capacity for batteries, underlining its dominant position in the lithium supply chain.

Meeting Lithium Demand: The Need for New Production

As the world increases its production of batteries and electric vehicles, the demand for lithium is projected to soar.

In 2021, global lithium carbonate equivalent (LCE) production sat at 540,000 tonnes.

By 2025, demand is expected to reach 1.5 million tonnes of LCE. By 2030, this number is estimated to exceed 3 million tonnes.