IN SUMMARY
Lithium-iron-phosphate (LFP) has moved from a China-centred cathode chemistry to a serious global competitor to nickel-based cells, helped by its cycle life, safety and lower cost. As the EU Battery Regulation brings carbon footprint requirements into force, manufacturers now have to weigh environmental impact alongside cost to stay commercially viable. Minviro and Exawatt combined life cycle assessment and bottom-up cost modelling across 27 LFP production pathways to show where the real decarbonisation opportunities lie, and what they cost.
The carbon footprint sits in the materials, not just the factory. Switching to renewable manufacturing electricity helps, but the largest share of impact, and the greatest reduction potential, lies in raw material production, starting with lithium and graphite.
Lower carbon need not mean higher cost. Switching lithium from spodumene to brine cuts the battery’s climate impact by around 5 to 10% with little or no cost penalty, and changing graphite source delivers a substantial impact reduction for under a 5% cost variation.
Raw material impacts vary by up to an order of magnitude. The footprint of one kilogram of battery-grade lithium chemical or anode-grade graphite can differ tenfold depending on geological source, processing route and the grid mix used at each step.
Why LFP, and why its footprint is not a fixed number
LFP has gained ground on nickel-based chemistries because of its cycle life, thermal stability and value for money, with Tesla, BYD and a growing list of North American and European producers adopting it. Its main drawback is lower energy density, 170 to 200 Wh/kg at cell level against 220 to 250 Wh/kg for NMC and NCA, which means more cells per pack. But the question this study set out to answer is not how LFP compares to nickel on paper. It is how much an LFP battery’s carbon footprint changes depending on how and where it is made. To test that, Minviro and Exawatt held the bill of materials constant and varied three inputs: manufacturing electricity, lithium carbonate source and graphite source.
How the study was built
The team modelled a generic 70 kWh LFP pack suitable for an electric car, using a cradle-to-gate boundary ending at the pack manufacturing facility. The functional unit is one kilowatt-hour of nominal capacity in an LFP pack. The bill of materials draws on the Argonne GREET model with Minviro adjustments from primary data, with background data from Ecoinvent and the Environmental Footprint 3.0 method, focused on climate change potential. Three changeable inputs were each given three options: manufacturing electricity from China, the USA or Norway; lithium carbonate from Australian spodumene, Argentinian brine or Chilean brine; and graphite from Chinese synthetic, Chinese natural or Swedish natural. Every combination was modelled, producing 27 pathways with matched carbon and cost results.