IN SUMMARY
As demand for batteries grows across electric vehicles, energy storage and consumer electronics, building responsible supply chains has become both complex and critical. Manufacturers face overlapping pressures: the carbon intensity of production, the ethical and environmental challenges of sourcing lithium, cobalt and nickel, and tightening regulation led by the EU Battery Regulation. This guide, part of Minviro's "Path to Product" series, brings these threads together, walking through the key battery materials and their impacts, how cells are manufactured, the most effective levers for cutting carbon, the circular economy options, and what regulatory compliance now requires, all through the lens of life cycle assessment.
Active materials are the climate hotspots. The production of nickel sulfate, graphite and lithium compounds represents a major share of a battery's total emissions, so shifting to lower-impact or recycled sources is where the biggest reductions lie.
Energy source and refining can cut emissions up to 40%. Minviro's LCAs show that using renewable electricity and improving refining processes can cut emissions by up to 40%, whether materials are virgin or recycled.
Circularity recovers up to 95% of materials. Recycling initiatives can recover up to 95% of battery materials over time, reducing reliance on virgin inputs and helping stabilise costs against volatile commodity markets.
The key battery materials and their footprints
A battery's environmental impact is dominated by its materials, and each carries its own challenges. Lithium comes mainly from hard-rock mining and brine extraction, with direct lithium extraction (DLE) able to cut energy use by up to 40% versus traditional methods. Nickel sulfate is central to high-performance NMC and NCA cathodes, but its footprint varies widely, laterite ores processed via HPAL or RKEF can be far more carbon-intensive than sulfide-based production. Cobalt, critical to nickel-rich NMC, brings serious responsible-sourcing concerns, making recycling and nickel-free chemistries important. Graphite is the dominant anode material, but synthetic graphite can have an 8x higher carbon footprint than natural, mainly from energy-intensive production, so clean electricity is decisive. Silicon is emerging as an anode enhancer: Minviro has demonstrated an 85% CO₂ reduction for silicon-bearing anodes compared to pure graphite. Manganese offers stability and affordability, while aluminium and copper, used in casing, wiring and current collectors, are best addressed through recycling.
How batteries are made
Understanding where impacts arise means understanding the manufacturing process, which runs through four main stages. First, cathode and anode manufacturing: active material slurries are mixed, coated onto current collectors, roll-pressed flat, then slit and notched into battery-sized pieces. Second, cell manufacturing: cylindrical cells are assembled by winding, while pouch cells use lamination and stacking, with electrolyte injected during assembly. Third, formation: cells are charged, discharged and stabilised, degassed where needed, then inspected for safety and performance. Fourth, pack manufacturing: modules of assembled cells are placed into the pack and connected. Each stage consumes energy and materials, and mapping them is what allows an LCA to identify exactly where the largest contributions to life cycle impact occur, across as many as 16 environmental impact categories, not just carbon.