The role of graphite in the carbon footprint of electric vehicle batteries has been underestimated, with new scientific evidence pointing out that the accuracy of industrial data is crucial for decarbonization.
The complex accounting of greenhouse gas emissions associated with electric vehicle manufacturing gains a new chapter. For a long time, the environmental debate around electromobility has focused excessively on the extraction of metals such as nickel and cobalt, relegating to the background an omnipresent component in the anode of almost all lithium-ion batteries: graphite.
New studies published in the Journal of Energy Storage, including a 2026 study conducted by German researchers, reveal that the carbon footprint of energy cells has been systematically underestimated. The central reason lies in the use of outdated or incomplete inventories of the synthetic graphite production process, especially in energy-intensive industrial routes such as the Acheson process.
The invisible weight of graphite in the life cycle
The technical problem is profound. The production of synthetic graphite requires high temperatures and voracious electrical consumption, as well as constant wear of equipment such as crucibles. When these factors are not properly accounted for, a substantial portion of CO₂ emissions “disappears” from environmental impact calculations.
Updating this data dramatically changes the scenario. In an analysis of an NMC622 cell (nickel, manganese, and cobalt), the carbon footprint jumped from 58 kgCO₂e/kWh to 93 kgCO₂e/kWh after including primary industrial data—a 60% increase. This impact is not limited to nickel-rich batteries; it also extends to LFP (lithium‑iron‑phosphate) technologies, widely adopted in the global stationary storage and mobility market.
“A 50 kWh battery does not carry a label indicating how many tons of CO₂ were emitted to manufacture it. That number must be built from the production chain.”
Challenges for the Energy Transition
The lesson that emerges from these studies is that the energy transition requires rigorous methodology rather than market simplifications. Often, decisions about which technology is “cleaner” are based on generic literature averages, creating a false sense of precision regarding the real performance of an electric vehicle compared to alternatives such as internal combustion engines or vehicles powered by biofuels.
With the creation of working groups, such as the one established by the CNPE to formulate Brazil’s national e‑mobility strategy, the need for local and transparent inventories becomes urgent. The true sustainability of a vehicle does not lie solely in the absence of tail‑pipe emissions, but in the total embodied carbon from mining and material processing to disposal.
Looking ahead, the conclusion is clear: decarbonization will not be won by the technology that tells the best story, but by the one that can demonstrate, through precise measurements and updated inventories, superior performance across its entire value chain. The map to environmental success depends, above all, on accurately accounting for the invisible costs of the materials that underpin our low‑carbon economy.