At present, lithium-ion batteries (LiBs) are most commonly used for electric vehicles and grid storage applications. However, LiBs have come under severe scrutiny for their environmental and social impacts caused by exploitative mining in the Global South. Moreover, they face severe challenges with regards to their supply chain including the ever-increasing demand of critical raw materials and the emergence of mining and manufacturing monopolies, which in turn has created significant price volatility. These supply chain weaknesses put the battery demand satisfaction, and with it the energy transition at risk. This fellowship proposal aims at advancing the development of aluminium-ion batteries (AiBs) as an innovative, sustainable, and resilient alternative to LiBs. To this end, I will employ a multidisciplinary research approach combining materials science with environmental, economic, policy, and supply chain considerations. Compared to LiBs, AiBs have the advantage of increased volumetric energy densities (increased amount of energy without increasing the size of the battery), lower supply chain risks (abundance of raw materials) and lower environmental footprint (the use of recycled aluminium can avoid the burden of ore processing). Despite these important advantages, AiBs are still under-researched and the battery performance falls short of its potential. Two primary challenges hinder their progress: 1) the cathode (electrical conductor) materials tested to date for AiBs demonstrate low performance and short lifetime, and 2) there is a significant knowledge gap regarding the underlying reactions that determine and hamper performance, impeding precise control of battery performance. With this fellowship, I lay out an ambitious programme to address these key technical challenges holding back AiB development. Here, I propose a novel materials design approach to explore a previously untapped pool of materials that could serve as potential AiB cathodes. The in-depth investigation of their fundamental electrochemical and molecular reaction mechanisms via sophisticated characterisation techniques during battery usage will create new knowledge that will be leveraged to identify performance bottlenecks, enabling the engineering of high-performance cathode materials for AiBs. This research proposal is strongly embedded in and guided by sustainability and resilience considerations of AiBs. My team and I will research synthesis methods informed by green chemistry principles to avoid lengthy and energy-intensive manufacturing processes. Moreover, we aim to use battery materials that are not only abundant and evenly distributed geographically, but also have minimal social and environmental impacts. We will apply life cycle assessment and techno-economic models evaluating the impacts across the AiB value chain to inform the battery materials design process. During the fellowship extension (+3 years), the development of AiBs will be continued towards up-scaling and prototyping, where the main challenges to be tackled will be the development of materials manufacturing processes suitable for up-scaling and the design of the battery cell. This research will benefit from a strong cross-disciplinary academic and industry network supporting the advancement of this exciting technology and the generation of global impact. This research not only pushes the limits of an emerging battery technology and sees through its advancement towards prototyping, but it will also support the alleviation of supply chain bottlenecks and geopolitical risks associated with current lithium-ion batteries. This will have significant academic impact via the creation of new knowledge while fostering societal and environmental benefits. Through the establishment of a robust green battery supply chain, this research will contribute to a resilient energy future.

Technology critical metals (TCMs) are pivotal to achieving Net Zero goals. These metals include for example lithium, cobalt, rare earths and platinum group metals. TCMs are deemed to be "critical" because they are economically important but at risk of short supply. The UK Government's Net Zero Strategy: "Build Back Greener" (2021) highlights the supply of these materials as a key challenge for the UK's energy transition and the need for a circular economy in these materials. They are used in wind-power, EV motors and batteries, LEDs, solar-cells and the hydrogen economy. The Government's (2022) Critical Minerals Strategy, "Resilience for the Future", emphasises the importance of these materials and the global supply-chain pressures. The UK's first critical mineral list identified 18 elements as TCMs (British Geological Survey, 2022). Currently, recycling rates for TCMs are very low, for example < 5% for neodymium , used in rare earth magnets ("Critical Raw Materials Resilience" EU report). There are a number of reasons for this, including a lack of specific incentives or legislation, current product designs often impede separation, in some applications there is a very low concentration of the critical material, often the value chains are fragmented, and current recycling processes, designed for bulk metals, are rather crude resulting in the finely distributed TCMs being lost in a linear economy. The overarching aim of RECREATE is to develop a circular economy for TCMs, keeping the materials or components in the highest value form with the lowest environmental footprint. The project brings together three of the leading research institutes in the UK (Universities of Birmingham, Leicester and Edinburgh) who each specialise in different technologies for the extraction and re-use or recycling of TCMs. The project includes leading industrial and public-sector players and policy makers, all involved in the drive to create a circular economy for critical materials in the UK. The research is informed by a system-wide perspective derived from a deep understanding of the industrial challenges for recycling of these materials, and of the governance structures that drive a circular economy. This project will undertake low TRL transformative research to generate radical improvements in automated sorting, "short loop" recycling, pyrometallurgical and chemical processes with reduced environmental impact, biological processes for dilute effluents, and new materials and product-designs which make re-use or recycling easier. Ultimately the project is developing a toolbox of technologies which can sense, sort, separate and re-use or recycle a broad range of TCMs from a wide range of products. These new technologies will be benchmarked using life cycle and techno economic assessment and the legislative drivers for a circular economy will be explored.

Along with many other countries worldwide, the UK is committed to achieving a low carbon economy. There is a plan to achieve net zero carbon dioxide emissions by 2050, with a key component of this plan being a ban on the sale of new petrol and diesel cars by 2035, and a switch to electric vehicles. These vehicles will require storage batteries that contain many components made of metals that have limited supplies. For example, a recent open letter authored by Professor Richard Herrington (principal investigator for the NHM on this proposal) explained that if the UK is to meet its electric car targets, it will require three quarters of the world's current total annual production of lithium - an essential component of modern electric vehicle batteries. Whilst current rates of lithium production are sufficient to meet global demand, we need to investigate additional lithium resources if we are to meet greenhouse gas emission targets. This proposal seeks to better understand the Earth system processes that concentrate lithium into mineral deposits, from which lithium can be mined in both an economically feasible and an environmentally responsible manner. Our central hypothesis is that major lithium deposits are largely formed in parts of the world where continental collision occurs as a consequence of plate tectonics. We will further test the hypothesis that within these collisional environments there is a "life-cycle" of tectonic processes that is reflected in the formation of different types of lithium deposits. Broadly speaking, in the first stage lithium is moderately concentrated in igneous rocks that are formed in this setting. Lithium is a relatively soluble element, which is readily leached and weathered from these rocks (particularly by hot geothermal water) and the lithium-rich waters may accumulate in basins that are also formed during continental collision. If the climate is arid, the waters evaporate to form a lithium-rich brine that can be an economically viable lithium deposit in its own right. In these brine basins, complex chemical processes and extreme microbial life may play a role in cycling elements and concentrating the lithium into sediments. Over time, the geothermal and volcanic activity ceases and the lithium-rich sediments may be buried and thus preserved for millions of years. Subsequently, these buried rocks may also serve as a source of lithium that can be extracted. With further burial and then heating, these lithium-rich sediments can reach temperatures at which they undergo melting and the formation of lithium-enriched pegmatites and granites. Again, these rocks may contain sufficient concentrations and amounts of lithium to represent a source of lithium that can be extracted for ultimate incorporation in electric vehicle batteries. At each stage of the life-cycle there are uncertainties regarding the source of lithium, and how it is transported and trapped. The different types of lithium deposits also vary in how easy it is to extract the lithium, and we need to consider how to do this in an environmentally responsible way. We will tackle these problems by bringing together a group of scientists who have considerable expertise in all aspects of this lithium journey. We will use a wide range of techniques, from simple geological observations through to highly sophisticated isotopic analyses and microbiological techniques, to track the behaviour of lithium. We will work alongside industry partners to identify the types of deposits that can be profitably extracted while simultaneously minimising any damage to the environment, and we will investigate the potential for more sustainable methods of lithium extraction using microbial processes. We anticipate that our research will provide industry with new targets for exploration for lithium resources. This will not only help secure a low carbon economy for the UK, but also provide important economic benefits to the UK and other nations.

The Circular Economy (CE) is a revolutionary alternative to a traditional linear, make-use-dispose economy. It is based on the central principle of maintaining continuous flows of resources at their highest value for the longest period and then recovering, cascading and regenerating products and materials at the end of each life cycle. Metals are ideal flows for a circular economy. With careful stewardship and good technology, metals mined from the Earth can be reused indefinitely. Technology metals (techmetals) are an essential, distinct, subset of specialist metals. Although they are used in much smaller quantities than industrial metals such as iron and aluminium, each techmetal has its own specific and special properties that give it essential functions in devices ranging from smart phones, batteries, wind turbines and solar cells to electric vehicles. Techmetals are thus essential enablers of a future circular, low carbon economy and demand for many is increasing rapidly. E.g., to meet the UK's 2050 ambition for offshore wind turbines will require 10 years' worth of global neodymium production. To replace all UK-based vehicles with electric vehicles would require 200% of cobalt and 75% of lithium currently produced globally each year. The UK is 100% reliant on imports of techmetals including from countries that represent geopolitical risks. Some techmetals are therefore called Critical Raw Materials (high economic importance and high risk of supply disruption). Only four of the 27 raw materials considered critical by the EU have an end-of-life recycling input rate higher than 10%. Our UKRI TechMet CE Centre brings together for the first time world-leading researchers to maximise opportunities around the provision of techmetals from primary and secondary sources, and lead materials stewardship, creating a National Techmetals Circular Economy Roadmap to accelerate us towards a circular economy. This will help the UK meet its Industrial Strategy Clean Growth agenda and its ambitious UK 2050 climate change targets with secure and environmentally-acceptable supplies of techmetals. There are many challenges to a future techmetal circular economy. With growing demand, new mining is needed and we must keep the environmental footprint of this primary production as low as possible. Materials stewardship of techmetals is difficult because their fate is often difficult to track. Most arrive in the UK 'hidden' in complex products from which they are difficult to recover. Collection is inefficient, consumers may not feel incentivised to recycle, and policy and legislative initiatives such as Extended Producer Responsibility focus on large volume metals rather than small quantity techmetals. There is a lack of end-to-end visibility and connection between different parts of techmetal value chains. The TechMet consortium brings together the Universities of Exeter, Birmingham, Leicester, Manchester and the British Geological Survey who are already working on how to improve the raw materials cycle, manufacture goods to be re-used and recycled, recycle complex goods such as batteries and use and re-use equipment for as long as possible before it needs recycling. One of our first tasks is to track the current flows of techmetals through the UK economy, which although fundamental, is poorly known. The Centre will conduct new interdisciplinary research on interventions to improve each stage in the cycle and join up the value chain - raw materials can be newly mined and recycled, and manufacturing technology can be linked directly to re-use and recycling. The environmental footprint of our techmetals will be evaluated. Business, regulatory and social experts will recommend how the UK can best put all these stages together to make a new techmetals circular economy and produce a strategy for its implementation.