{"id":2209,"date":"2021-07-09T16:43:19","date_gmt":"2021-07-09T14:43:19","guid":{"rendered":"https:\/\/wpethzprd.ethz.ch\/energy\/?p=2209"},"modified":"2025-03-27T16:14:44","modified_gmt":"2025-03-27T15:14:44","slug":"deep-sea-mining","status":"publish","type":"post","link":"https:\/\/blogs.ethz.ch\/energy\/deep-sea-mining\/","title":{"rendered":"Deep-sea mining for our mobility transition: the quest for sustainable batteries"},"content":{"rendered":"\t\t
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By Leopold Peiseler<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Leopold Peiseler<\/a> is a doctoral researcher at the Energy and Technology Policy Group<\/a> and the Materials and Device Engineering Group<\/a>. He is also a member of the Institute of Science Technology and Policy<\/a>, contributing to the SWISSCHAINS<\/a> research incubator. His work is focused on how carbon emissions of Lithium-ion batteries can be reduced.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Climate change is pressing and we need fast decarbonisation of all aspects of life. As a multi-purpose technology, batteries play a central role in the reduction of carbon emissions. However, the current supply chain of Lithium-ion batteries is often associated with environmental and social burdens. Thus, some voices are advocating alternative mining: potato-sized rocks, rich in critical metals. The catch? These rocks lie 4000-6000m deep in the oceans and we have little to no idea about this niche ecosystem or the severity of impacts on it if mining were to occur.<\/h3>

The transport sector is the single largest CO2 emitting sector<\/a> in Switzerland – and as opposed to every other sector in the country, it did not decrease but instead increase<\/em> its emissions since 1990. In fact, Switzerland is really only one example as this pattern is shown by many countries<\/a>. This is a model example of the notorious rebound effect: engineering efficiency gains are undermined by the rising demand in transportation services<\/a> (primarily cars).<\/p>

Complex problems like this can be addressed at different levels \u2013 see Figure 1. Systemic changes at Level 1 are arguably the most powerful but also inherently hard to implement. Interventions at this level are critical to combat climate change but are not the focus of this article \u2013 interested readers may enjoy this report<\/a>. Leaving system-level approaches aside, it is evident that the decarbonisation of transport requires low-carbon technologies (Level 2 in Figure 1). In this context, energy storage solutions are a particular challenge because only a few are appropriate for mobile applications.<\/p>

Lithium-Ion batteries (LIB) are one of the appropriate solutions: they are a multi-purpose technology with many low-carbon applications spanning from stationary storage over consumer electronics to mobile applications, such as in electric vehicles. Depending on the desired performance characteristics, LIBs require different metals. Generally speaking, a Lithium-ion battery contains Lithium (Li), Graphite (C), Aluminium (Al), Copper (Cu) and a mixture (or only one) of Nickel (Ni), Manganese (Mn), Cobalt (Co) or Iron (Fe).<\/p>

Fortunately, in some sense, the adoption of low-carbon solutions will see unprecedented growth: by 2030, the battery demand alone is estimated to grow between mind-boggling 600%\u00b9 and 1300%<\/a>. The anticipated increase is so substantial that even with technological innovation, mining capacities of the above mentioned metals inevitably require expansion (Level 3 in Figure 1).<\/p>

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Figure 1: Framework visualising potential intervention levels<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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As a consequence, we must raise the question where the metals come from and, perhaps more importantly, under what circumstances they are sourced. This endeavour is best tackled by analysing the battery\u2019s supply chain<\/a> (Level 4 in Figure 1): a supply chain provides insights into the materials of a product and the activities performed to deliver those materials, from mineral extraction all the way to end-of-life treatment.<\/p>

So what\u2019s the problem?<\/strong><\/h4>

The conventional supply chain of batteries is subject to harsh criticism, predominantly from a human rights perspective<\/a>. In this context, it is necessary to break down \u2018sustainability\u2019 into its different dimensions. One classic approach clusters sustainability into economic, environmental, and social aspects. Beyond this differentiation, each metal comes with its own sustainability challenges as the metals required for LIB are globally unevenly distributed and extracted using a variety of different processes<\/a>. Therefore, a sustainability assessment of each metal<\/a> is imperative.<\/p>

Most prominently<\/a>, lithium mining is often associated with unsustainable water consumption in water-stressed regions (e.g., Chile, ~38% of global production), Nickel extraction with deforestation and biodiversity loss in Indonesia and the Philippines (18% and 17% of global production, respectively), and Cobalt with hefty human rights violations including child labour in artisanal mining operations (Democratic Republic of Congo, at 57% GP). The latter is also discussed in greater detail in Martin Beuse\u2019s blog post<\/a>.<\/p>

With some light shed on the importance of critical metal mining and the issues around current mining methods, let\u2019s now dive into a nascent mining technique: deep-sea mining.<\/p>

Deep and salty relief on the horizon?<\/strong><\/h4>

On the ground of our oceans, there are a myriad of potato-sized rocks (aka nodules) \u2013 see Figure 2a. These nodules are particularly plentiful in the Clarion\u2013Clipperton Zone (CCZ)<\/a>, an area between Hawaii and Mexico of the size of the European Union. The nodules formed over an inconceivably long time, only growing a few millimetres per million years<\/a>. What is making these peculiar formations so appealing is their metal composition and abundance:<\/p>

  1. One nodule consists of a high concentration of many critical metals<\/a> (Mn, Ni, Cu, Co) \u2013 not just one or two (usually the case for land ores).<\/li>
  2. The ore grade (the percentage of metals per nodule) is typically higher<\/a> than current terrestrial mineral deposits of the same metals.<\/li>
  3. The currently known amount of Nickel and Cobalt contained in the deep-sea nodules is estimated to exceed current terrestrial reserves<\/a> by 3 and 5, respectively.<\/li><\/ol>

    Figure 2b outlines what deep-sea mining could look like<\/a>. On the ground, machines would trawl the abyssal plain, separating the nodules from the sediments (you can think of this machine as an over-dimensioned vacuum cleaner). Next, the slurry would get pumped up to a mining support vessel that separates the nodules from residual sediments. Ultimately, the water, together with the remaining sediments, would get pumped back down into the ocean.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    Figure 2: (a) Picture of the seabed with potato-sized polymetallic nodules (Source<\/a>); (b) Schematic of a potential deep-sea mining operation (figure inspired by Hein et al. 2020<\/a>)<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    Contrary to what one would think about a cold, pitch dark, 4000-6000m (!) deep environment, this area is surprisingly biodiverse and hosts a large number of unique flora and fauna organisms<\/a>. The nodule extraction results in a direct loss of habitat and environmental alterations<\/a> such as sediment compaction, local and born-off plumes, and unnatural (anthropogenically caused) noises. It seems clear that the extraction operation would severely disturb and quite likely irreversibly harm<\/a> marine life in the deep. Moreover, the deep sea, its flora and fauna, and the potential mining impacts remain poorly understood<\/a>.<\/p>

    This translates into problematic uncertainties when comparing deep-sea mining with other metal sources. Figure 3 qualitatively compares the three high-level sustainability dimensions of aggregated critical metals from conventional, deep-sea, and recycling sources.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    Figure 3: Sustainability matrix comparing metal from conventional<\/a>, deep-sea<\/a> and recycling<\/a> sources.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    The governance of the deep<\/strong><\/h4>

    Following a 1994 UN agreement, the deep sea is governed by the International Seabed Authority<\/a> (ISA). The ISA controls the mineral exploration licensing and has divided the above-mentioned area between Hawaii and Mexico, into environmental protection and country-specific research regions<\/a>. Following exploration permits, the ISA will also provide mining permits in the future. It is planned to partially redistribute profits created by companies (of most likely wealthier nations) to non-participating countries according to an ISA royalty scheme<\/a>.<\/p>

    If designed and governed adequately, these governance characteristics can have a noticeable advantage over terrestrial mining, where only a few countries control the mining of some critical resources. However, the ISA is not without controversy. Some stakeholders claim that the ISA has a conflict of interest<\/a> since it is responsible for both the area\u2019s environmental protection and economic exploitation.<\/p>

    \u00a0<\/p>

    Take-away<\/strong><\/h4>

    Deep-sea mining is a polarising topic. While conventional Cobalt mining is often linked to child labour, mining in the ocean evokes images of pristine marine ecosystems destroyed by underwater bulldozers. Comparing different mining technologies is a complex endeavour and, unfortunately, does not have a simple solution. Recycling can alleviate the stress on virgin supplies \u2013 but a sufficient quantity of metals must enter the cycle in the first place. Regarding the extraction of these metals, the question is not how bad or good deep-sea mining is but how much better or worse<\/em> it is compared to current mining practices.<\/p>

    Given the significant uncertainty tied to deep-sea mining, no legitimate comparison can be drawn at this point \u2013 further research is required before mining permits are granted. In the meantime, every effort should be made to make terrestrial supply chains more sustainable.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    Cover photo by Wikipedia<\/a> CC BY-SA 3.0<\/p>

    \u00b9Bernhart, W. Lithium-Ion batteries: New Business Models Emerging. Roland Berger (2020).<\/p>

    Keep up with the Energy Blog @ ETH Zurich on Twitter @eth_energy_blog<\/a>.<\/em><\/p>

    Suggested citation: Peiseler, Leopold “Deep-sea mining for our mobility transition: the quest for sustainable batteries\u201d, Energy Blog @ ETH Zurich, ETH Zurich, July 7, 2021,<\/em> https:\/\/blogs.ethz.ch\/energy\/deep-sea-mining<\/em><\/a>\/<\/em><\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    If you are part of ETH Zurich, we invite you to contribute with your findings and your opinions to make this space a dynamic and relevant outlet for energy insights and debates. Find out how you can contribute<\/a> and contact the editorial team here<\/a> to pitch an article idea!
    <\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

    Climate change is pressing and we need fast decarbonisation of all aspects of life. As a multi-purpose technology, batteries play a central role in the reduction of carbon emissions. However, the current supply chain of Lithium-ion batteries is often associated with environmental and social burdens. Thus, some voices are advocating alternative mining: potato-sized rocks, rich in critical metals. The catch? These rocks lie 4000-6000m deep in the oceans and we have little to no idea about this niche ecosystem or the severity of impacts on it if mining were to occur.<\/p>\n","protected":false},"author":47017,"featured_media":2210,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[264264],"tags":[264264],"class_list":["post-2209","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-renewable-energy","tag-renewable-energy"],"yoast_head":"\nDeep-sea mining for our mobility transition: the quest for sustainable batteries - Energy Blog @ ETH Zurich<\/title>\n<meta name=\"description\" content=\"Climate change is pressing and we need fast decarbonisation of all aspects of life. As a multi-purpose technology, batteries play a central role in the reduction of carbon emissions. However, the current supply chain of Lithium-ion batteries is often associated with environmental and social burdens. Thus, some voices are advocating alternative mining: potato-sized rocks, rich in critical metals. The catch? These rocks lie 4000-6000m deep in the oceans and we have little to no idea about this niche ecosystem or the severity of impacts on it if mining were to occur.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.ethz.ch\/energy\/deep-sea-mining\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Deep-sea mining for our mobility transition: the quest for sustainable batteries - Energy Blog @ ETH Zurich\" \/>\n<meta property=\"og:description\" content=\"Climate change is pressing and we need fast decarbonisation of all aspects of life. As a multi-purpose technology, batteries play a central role in the reduction of carbon emissions. However, the current supply chain of Lithium-ion batteries is often associated with environmental and social burdens. Thus, some voices are advocating alternative mining: potato-sized rocks, rich in critical metals. The catch? These rocks lie 4000-6000m deep in the oceans and we have little to no idea about this niche ecosystem or the severity of impacts on it if mining were to occur.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.ethz.ch\/energy\/deep-sea-mining\/\" \/>\n<meta property=\"og:site_name\" content=\"Energy Blog @ ETH Zurich\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/eth.mest\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-07-09T14:43:19+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-03-27T15:14:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.ethz.ch\/energy\/files\/2021\/07\/Title.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"832\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Leopold Peiseler\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@esc_ethz_ch\" \/>\n<meta name=\"twitter:site\" content=\"@esc_ethz_ch\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Leopold Peiseler\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/deep-sea-mining\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/deep-sea-mining\\\/\"},\"author\":{\"name\":\"Leopold Peiseler\",\"@id\":\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/#\\\/schema\\\/person\\\/021a506b6c38a49dffadf6bd15b523a4\"},\"headline\":\"Deep-sea mining for our mobility transition: the quest for sustainable batteries\",\"datePublished\":\"2021-07-09T14:43:19+00:00\",\"dateModified\":\"2025-03-27T15:14:44+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/deep-sea-mining\\\/\"},\"wordCount\":1465,\"commentCount\":4,\"publisher\":{\"@id\":\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/deep-sea-mining\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/files\\\/2021\\\/07\\\/Title.jpg\",\"keywords\":[\"Renewable Energy\"],\"articleSection\":[\"Renewable Energy\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/deep-sea-mining\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/deep-sea-mining\\\/\",\"url\":\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/deep-sea-mining\\\/\",\"name\":\"Deep-sea mining for our mobility transition: the quest for sustainable batteries - Energy Blog @ ETH Zurich\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/deep-sea-mining\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/deep-sea-mining\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/blogs.ethz.ch\\\/energy\\\/files\\\/2021\\\/07\\\/Title.jpg\",\"datePublished\":\"2021-07-09T14:43:19+00:00\",\"dateModified\":\"2025-03-27T15:14:44+00:00\",\"description\":\"Climate change is pressing and we need fast decarbonisation of all aspects of life. 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