Both natural flake graphite and synthetic graphite can function as active anode material in lithium-ion batteries. In practice, most commercial battery cells use a blend of the two. But as battery manufacturers look to secure supply chains, reduce carbon footprints and manage costs, the choice between natural and synthetic has become more strategically important.
This article walks through the key technical and commercial differences — and explains why natural flake graphite from Europe is gaining ground.
How they are made
Natural flake graphite is mined from geological deposits where carbon crystallised under high heat and pressure over millions of years. After mining, it is mechanically processed (flotation, milling, classification) and then shaped into spherical particles for anode use. The key processing steps are spheroidisation and surface coating.
Synthetic graphite is manufactured from petroleum coke or coal tar pitch through a high-temperature graphitisation process (the Acheson process) at temperatures up to 3 000 °C. This extreme heat requires enormous amounts of electricity — approximately 10–15 MWh per tonne of graphite produced.
Performance comparison
| Property | Natural Flake Graphite | Synthetic Graphite |
|---|---|---|
| Reversible capacity | 340–360 mAh/g | 340–370 mAh/g |
| First-cycle efficiency (ICE) | 92–94% | 94–96% |
| Rate capability (fast charging) | Good (improves with coating) | Excellent |
| Long-term cycle life | Excellent | Excellent |
| Natural particle morphology | Platelet → spheroidised | Irregular → processed |
| Tap density after spheroidisation | 0.8–1.0 g/cm³ | 0.7–0.9 g/cm³ |
The performance gap between natural and synthetic has narrowed significantly through improvements in spheroidisation, purification and surface treatment. For most EV applications, blended anodes (natural + synthetic, typically 60:40 to 80:20) deliver the optimal balance of capacity, rate and cost.
Sustainability: natural graphite wins clearly
This is where the two materials diverge most sharply. The energy required to produce synthetic graphite through the Acheson process results in a carbon footprint estimated at 5–10 tonnes CO₂e per tonne of graphite — compared to roughly 1–2 tonnes CO₂e per tonne for natural graphite (mining, processing and transport).
For battery manufacturers calculating Scope 3 emissions: switching from synthetic to natural graphite in the anode can reduce anode-related CO₂e by 60–80%. As EU battery regulation carbon footprint declarations become mandatory from 2025, this difference will have direct commercial implications.
Norwegian flake graphite from Skaland benefits further from Norway's almost entirely renewable electricity grid (97%+ hydro and wind power). The mine's processing facility runs on this clean energy, making the upstream carbon footprint of Skaland graphite among the lowest of any graphite source globally.
Cost
Natural flake graphite is consistently lower cost than synthetic graphite before processing. Battery-grade spherical natural graphite (SNG) typically costs 20–40% less per tonne than comparable synthetic graphite anode material. The cost advantage of natural graphite has widened since 2022 as energy costs (critical to synthetic production) have risen.
Which should you use?
For most applications, the answer is a blend — using natural flake graphite (spheroidised) as the primary anode material and synthetic graphite as a performance-enhancing additive at 20–40%. This gives you:
- Lower cost than pure synthetic anode
- Better rate capability than pure natural anode
- Significantly better carbon footprint than synthetic-dominant anodes
- Supply chain diversification (especially if natural graphite is sourced from Europe)