What Materials Are Inside an EV Battery?
Quantities are estimates built from published material intensities (Argonne National Laboratory, ICCT, IEA) and cell teardowns, labelled as estimates wherever they appear.
An EV battery is mostly metal foils, carbon and cathode powder — and the element it is named after is one of the smallest things in it.
Two different ledgers get mixed up in almost every article on this subject. One counts only the mined minerals — the graphite, nickel, cobalt and lithium that come out of the ground. The other weighs the whole pack, where aluminium housings, steel, cooling hardware and electronics take a large share. This guide keeps the two separate: first the five components inside every cell and what each is made of, then a full, honestly-labelled breakdown of a real-sized pack, and finally what changes between chemistries.
Quick answer. Every EV battery cell is built from the same five things: a metal-oxide or iron-phosphate cathode, a graphite anode, a lithium-salt electrolyte, a plastic separator film, and copper and aluminium foil current collectors. In a typical 75 kWh pack the heavy materials are the cathode powder (about 105–115 kg) and graphite (about 60–70 kg). The famous one — lithium — is only about 8–10 kg of a roughly 478 kg pack, around 2% of its weight.
Key figures: Cathode powder ~105–115 kg · Graphite ~60–70 kg · Electrolyte ~30–40 kg · Total lithium ~7.5–10 kg (≈40–53 kg as lithium carbonate) · Rare earths in the cells: none
The five core components
Every lithium-ion cell — cylindrical, prismatic or pouch — is the same five materials arranged in layers.
1. The cathode — the chemistry itself
The cathode is a metal-oxide (or iron-phosphate) powder coated onto aluminium foil, and it is the heaviest single component in the cell: about 105–115 kg of cathode powder in a 75 kWh nickel-rich pack. In an NMC 811 cathode that powder is roughly 49 kg of nickel, 6 kg of cobalt and 6 kg of manganese per pack, with lithium woven through its crystal structure; in an LFP cathode the metals are iron and phosphorus instead, and there is no nickel or cobalt at all.
The cathode is also where the lithium starts out: in a discharged battery, most of the lithium sits in the cathode — charging moves it into the anode, which is why “a charged battery’s lithium is in its graphite” is the correct picture at full charge.
2. The anode — graphite, and a little silicon
The anode is graphite coated onto copper foil: about 60–70 kg in a 75 kWh pack, which makes graphite the largest single mined mineral in the battery and the largest material in the anode — though not, as often claimed, the largest material in the pack (the cathode powder outweighs it, and aluminium outweighs both once the housing is counted). Graphite reaches the cell as either mined natural graphite or synthetic graphite made from petroleum coke, both purified and shaped into near-spherical particles. Modern cells also blend roughly 3–10% silicon (as silicon oxide or silicon-carbon) into the graphite to raise capacity — helpful, but far from the “silicon anode” headlines.
3. The electrolyte — the lithium highway
Between the electrodes sits the electrolyte: a lithium salt — almost always lithium hexafluorophosphate (LiPF6) — dissolved in a blend of organic carbonate solvents, with a few percent of additives that protect the electrodes. It is far heavier than most articles suggest: about 30–40 kg in a 75 kWh pack, roughly 8–12% of a cell’s mass. Its job is narrow and vital: it carries lithium IONS between the electrodes. It does not carry electrons — if electrons could flow through the electrolyte and separator, the cell would short-circuit; the electrons take the outside path through the car’s motor instead.
4. The separator — a plastic film with one job
The separator is a microporous plastic film — polyethylene, polypropylene, or a layered sandwich of both, sometimes with a ceramic coating — about 3–5 kg per pack. It physically keeps the cathode and anode apart while its pores, soaked in electrolyte, let lithium ions pass. It must be an electrical insulator: a separator that conducted electrons would be an internal short. Many separators are also a safety device, designed to soften and seal their pores if the cell overheats.
5. The current collectors — copper and aluminium foils
The electrode powders are coated onto metal foils thinner than a human hair: aluminium foil under the cathode (about 10–13 kg per pack) and copper foil under the anode. Counting the copper busbars that join the cells, a 75 kWh battery contains roughly 25–30 kg of copper in total. (A widely quoted IEA figure of about 53 kg of copper describes the whole car — battery, motor and wiring harness together — not the battery alone.)
A 75 kWh pack, weighed honestly
Here is the full breakdown — built from published intensities, labelled as an estimate, and added up to a real pack’s weight.
A widely shared version of this table sums to barely 300 kg and calls itself “full”. A real 75 kWh pack weighs about 460–490 kg — the difference is the housing, cooling, wiring and electronics that partial tables leave out, and that this one includes.
| Material | kg in a 75 kWh nickel-rich pack |
|---|---|
| Cathode active material (total) | ~105–115 |
| — of which nickel | ~49 |
| — of which cobalt | ~6 |
| — of which manganese | ~6 |
| Graphite (anode) | ~60–70 |
| Electrolyte | ~30–40 |
| Copper (foil + busbars) | ~25–30 |
| Steel cell cans (cylindrical cells) | ~30–40 |
| Aluminium foil (cathode collector) | ~10–13 |
| Separator | ~3–5 |
| Total lithium (metal, in cathode + electrolyte) | ~7.5–10 |
| Pack housing, cooling, BMS, wiring, plastics | ~120–160 |
| Total pack mass | ~460–490 |
One naming caution: this is a generic nickel-rich (NMC 811-class) pack. The actual US Tesla Model 3 Long Range uses an NCA cathode instead — similar totals, but with cobalt nearer 2–5 kg and manganese at exactly zero, a distinction the table this replaces got wrong.
How materials differ: NMC vs LFP
Change the cathode and the whole shopping list changes — the clearest example is cobalt’s collapse.
An early NMC 111 cathode carried about 0.39 kg of cobalt per kWh — roughly 29 kg in a 75 kWh pack. NMC 811 cut that to about 0.08 kg per kWh (~6 kg), and LFP removes cobalt, nickel and manganese entirely, replacing them with about 0.6–0.7 kg of iron per kWh in an iron-phosphate cathode.
The rest of the recipe barely changes: both chemistries use graphite anodes (LFP slightly more per kWh, about 1.0–1.2 kg, because its cells run at lower voltage), the same LiPF6 electrolyte family, the same separator films and the same copper and aluminium foils. LFP’s material advantage is not exotic: iron and phosphorus are abundant and cheap, which is a large part of why LFP packs cost less.
Beyond the cell: the rest of the pack
Cells are only about two-thirds to three-quarters of a pack — the remainder is structure, cooling and electronics.
In a module-based pack, roughly 25–35% of the mass is not cells at all: an aluminium or steel housing, module frames, copper and aluminium busbars, a liquid cooling plate and its coolant, thermal interface materials, the battery management system’s circuit boards and sensors, and the wiring harness — together about 120–160 kg in a pack of this size. Cell-to-pack designs, which skip the module level, cut that non-cell share to roughly 15–20%, which is one reason they fit more energy into the same floor space.
Are there rare earths in an EV battery?
No — a lithium-ion battery cell contains no rare-earth elements at all, and cobalt is not one either.
The confusion is understandable: EVs do use rare earths, but in a different component. The permanent magnets inside many traction motors contain neodymium and small amounts of dysprosium or terbium — about half a kilogram to a kilogram of rare earths per car on the IEA’s figures — and plenty of EVs (induction-motor and externally-excited designs) use none at all. Nothing in the cathode, anode, electrolyte or separator of any production EV battery is a rare-earth material.
Where the materials come from
The supply map is concentrated — most of all at the processing stage, not the mine.
Graphite is the sharpest case: on US Geological Survey figures, China mines roughly 78–82% of the world’s natural graphite and processes more than 90% of the battery-grade material, including most synthetic-graphite finishing. Lithium is mined mainly in Australia (hard rock) and Chile (brines) but is likewise refined disproportionately in China, and most cobalt comes from the Congo, again largely refined in China. It is refining capacity, as much as geology, that new battery plants in North America and Europe are being built to change.
Frequently asked questions
What are the five main components of an EV battery cell?
A cathode (metal-oxide or iron-phosphate powder on aluminium foil), a graphite anode (on copper foil), a lithium-salt electrolyte, a plastic separator film, and the two foil current collectors. Everything else in the pack — housing, cooling, electronics — is structure around thousands of those cells.
How much lithium is in an EV battery?
About 7.5–10 kg of lithium metal in a 75 kWh pack — roughly 40–53 kg expressed as lithium carbonate equivalent (LCE), the unit the lithium trade uses. A smaller ~60 kWh LFP pack holds about 6–7 kg. Claims of 12 kg or more for a modern pack come from older, less efficient chemistry intensities.
What percentage of an EV battery is lithium?
About 2% of the pack’s weight. Lithium is the lightest metal and the battery is named for the ion that moves, not for the bulk of its mass — cathode powder, graphite, foils, steel and the housing all outweigh it many times over.
Is graphite the biggest material in an EV battery?
It is the biggest single mined mineral and the biggest material in the anode (~60–70 kg per 75 kWh pack). Taken as a whole, the cathode powder is heavier (~105–115 kg), and aluminium is the pack’s largest material family once foil, housing and cooling are combined.
What is the separator in a battery made of?
A microporous polyolefin plastic — polyethylene and/or polypropylene, sometimes ceramic-coated. It keeps the electrodes apart, lets lithium ions through its electrolyte-soaked pores, and must never conduct electrons.
Is there copper in an EV battery?
Yes — roughly 25–30 kg in a 75 kWh battery, as the anode’s current-collector foil and the busbars joining the cells. A whole EV contains roughly twice that again once the motor and wiring are included.
Do EV batteries contain rare earths?
No. Rare earths (neodymium and others) appear in some traction motors’ permanent magnets, not in battery cells. Cobalt, nickel and lithium are not rare-earth elements.
Conclusion
An EV battery’s material story is one of ordinary metals in extraordinary quantities — and one famous metal in a surprisingly small one.
Cathode powder and graphite do the heavy lifting, copper and aluminium carry the current, a plastic film keeps it all safe, and roughly 8–10 kg of lithium — about 2% of the pack — makes the whole system work. Read any breakdown that totals far less than the pack’s real weight, or that puts rare earths inside the cells, with suspicion.
