IN SUMMARY
Lithium is the lightest metal and the lightest solid element, a soft, silvery-white alkali metal whose high electrochemical potential and thermal resistance make it indispensable to modern batteries. Found in continental brines, pegmatite rocks and certain minerals, it is central to electric vehicles, portable electronics and renewable energy storage. But the way lithium is produced varies enormously depending on the deposit, and so do its environmental impacts. This guide, part of Minviro's "Explore the Elements" series, introduces lithium's geology, the distinct production routes, supply dynamics and the sustainability challenges shaping the industry.
Lithium is defined by batteries. Its biggest use is in rechargeable lithium-ion batteries, prized for high energy density, light weight and long life, with further uses in heat-resistant glass and ceramics, lubricating greases and as a flux in metal production.
Source dictates everything. Brine, geothermal brine, sedimentary clay and hard-rock (pegmatite) deposits each form under different conditions and require different extraction methods, which means very different environmental footprints.
Sustainability centres on water and chemistry. Brine extraction in particular raises water use and contamination concerns, while processing is chemical-intensive, making efficient extraction, water management and recycling critical.
Why lithium is critical
Lithium (chemical symbol Li, atomic number 3) is the lightest metal and the lightest solid element, a soft, silvery-white alkali metal with a combination of high electrochemical potential and thermal resistance that makes it ideal for energy storage. Its most significant use by far is in rechargeable lithium-ion batteries, favoured for their high energy density, light weight and long lifespan, which is what makes them the technology of choice for electric vehicles, smartphones, laptops and grid storage. Lithium also goes into primary (non-rechargeable) batteries valued for reliable operation across a wide temperature range, and beyond batteries it is used in heat-resistant glass and ceramics, lubricating greases, and as a flux additive in iron, steel and aluminium production. This concentration of demand in batteries is why lithium sits at the centre of the energy transition.
Geology and the four production routes
Lithium forms through several geological processes, and each deposit type leads to a distinct extraction route. Brine deposits, concentrated in South America's Lithium Triangle, form as water evaporates in closed basins, leaving lithium-rich saline solutions that are extracted via solar evaporation ponds and then chemically treated to precipitate lithium carbonate. Geothermal brines, such as California's Salton Sea, leach lithium from hot subterranean rocks and allow lithium to be separated during geothermal energy extraction. Sedimentary clays, notably in Nevada, form from weathered lithium-bearing volcanic minerals and are processed by acid or alkaline leaching. Hard-rock (pegmatite) deposits, containing minerals like spodumene and lepidolite, are mined and physically processed into a concentrate, then converted to lithium compounds through roasting, leaching, purification and precipitation. Each route carries its own economic and environmental profile, which is exactly why the source of lithium matters so much to its footprint.