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Energy transition metals: the ESG dilemma

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This is a time of unprecedented opportunity for energy transition metals. Lithium, cobalt, graphite and rare earths are crucial building blocks of a decarbonised world – but to move towards a truly sustainable future these sectors must tackle a significant environmental, social and governance (ESG) challenge.

The central dilemma is clear. Can vital energy transition metals markets ramp up production fast enough to satisfy demand, while also revolutionising supply chains to meet ever-more stringent ESG requirements?

In a recent webinar, we drew on insight from across our LithiumCobaltGraphite and Rare Earths Research Suites to explore this topic in depth. Fill in the form to access a replay and read on for an introduction to some of the key supply chain challenges.

Chart shows demand outlook for key energy transition metals

Graphite: hydrofluoric acid means the environmental stakes – and costs – are high

Battery anodes for electric vehicles (EVs) and energy storage systems rely on graphite for more than 90% of their raw materials. With no immediate, widescale alternative, ESG issues have come into sharper focus as consumers question the sustainability of existing supply chains.

Natural graphite, mined mainly in China and, increasingly, Mozambique and Madagascar, is subject to traditional mining ESG concerns, such as water use and equipment and transport emissions. However, battery-grade graphite involves intensive purification and shaping into spherical form, which relies on large quantities of hydrofluoric acid (HF). This downstream process, currently only done in China, has much deeper ESG concerns.

With HF, the environmental stakes are high – and so are the monetary costs. It’s highly corrosive and its disposal is strictly regulated. If corners are cut, the impact can be devastating. 

Graphite now appears on many countries’ official lists of critical materials due to concerns over ESG issues, as well as China’s control over supply volumes and prices.

China is working hard to improve environmental standards in the graphite industry, introducing increasingly strict regulations since the mid-2010s. However, frequent inspections have resulted in ongoing rounds of temporary capacity closures – and some permanent. This has led to supply shortages and price rises. Graphite now appears on many countries’ official lists of critical materials due to concerns over ESG, and China’s control over supply volumes and prices.

Several mine developers outside China are looking to create a new supply chain, with plants being considered in locations around the world. Most are looking to use alternative, low- or zero-HF methodologies, such as acid-alkali or thermal-only. However, the former uses a strong set of environmentally challenging reagents, while the latter entails high energy consumption and production costs. Some companies are exploring other proprietary methods, none of which have yet been proven at scale.

Chart shows purification processes for natural graphite

Natural graphite isn’t the only – or indeed the dominant – option. Synthetic graphite is a fossil fuel derivative, manufactured artificially from needle coke. It’s an extremely energy-intensive process, but does produce high purity graphite suitable for battery anodes with little further processing. While China is the largest supplier, production is much more distributed than natural graphite, with large quantities produced by Japan, the US, India and Europe.

Both natural and synthetic graphite have complex ESG issues to overcome. And, while the development of silicon anode materials and solid-state battery technologies may erode long term demand, graphite will remain a vital material for lithium-ion battery anodes for years to come.

Lithium: high water consumption versus high carbon emissions?

The lithium sector faces a binary problem. Buyers – auto manufacturers, cathode manufacturers and other OEMs – must choose between two routes: brine or mineral sources. Each involves a distinct ESG challenge, centred on either water consumption or carbon emissions.

  • Brine sources:

Concerns over high water consumption at lithium brine operations have led to conflicts with local and state authorities in South America, and investigations into the efficacy of production. Plus, brine producers not only have greater water consumption rates than mineral concentrate producers, but they’re operating in some of the driest places on earth, with high levels of water risk.

  • Mineral sources:

Most lithium mineral concentrate is shipped to Chinese refineries reliant on coal power. In terms of embedded emissions per tonne of refined lithium produced, this refining stage contributes 70-90% of all carbon emissions within the mineral concentrate supply route. This doubling up effect, of high energy consumption and high emission fuel use within the mineral supply chain, makes refined lithium produced via mineral concentrate 3.5 times more CO2 intense than brine.

This creates a downstream dilemma. High embedded emissions within a value chain are a clear carbon risk. However, issues associated with high water consumption could hamper expansion plans and limit capacity.

Chart shows where future lithium production could come from

Over the coming decades, a growing proportion of refined lithium production is likely to come from unproven routes. This includes projects aiming to use direct lithium extraction (DLE) technology and extract from unconventional mineral deposits, such as clay, sedimentary or borosilicate minerals.

These routes have potential, but there are engineering challenges. There are no successful commercial-scale lithium production routes using unconventional mineral deposits as feedstock, and limited examples of DLE technology being successfully employed at commercial scale, or achieving the necessary quality of refined lithium.

Watch the webinar replay for a closer look at the future of lithium production. Fill in the form at the top of the page for complimentary access.

Cobalt: ESG adds to the rising cost challenge

The cobalt market is forecast to double in size by 2050, underpinned by a spectrum of battery applications. But a significant supply gap lies ahead, requiring further expansions at existing mining operations and new investment.

Chart shows base case cobalt mine supply will struggle to meet demand

There are several sizable obstacles. The cost of mining cobalt is on the rise, due to ore grade attrition and reserve depletion. Surging metal prices and strong EV momentum are triggering a revival of resource nationalism in key producing countries, posing a risk of supply disruption. ESG risk heightens the challenge.

Cobalt reserves and mine production are concentrated in regions and countries that exhibit significant ESG risks. The DRC and Indonesia, by far the top two cobalt reserve holders, are both categorised as high-ESG-risk countries in Verisk Maplecroft’s ESG Risk Index.

In an ‘ESG constrained supply’ scenario, a shortfall in the cobalt market can emerge as early as 2024. Battery recycling, if fully utilised, can ease the upcoming supply shortage, but it cannot fill the entire gap. This implies that virgin cobalt materials will remain critical to meet the surging demand. 

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