Mendeleev.com
What is inside an electric car?
An electric car is not just a large battery. It combines battery chemistry, power electronics, an electric motor and the same structural materials found in other vehicles.
The traction battery usually contains many lithium-ion cells. Depending on chemistry, cathode materials may include nickel, manganese, cobalt, iron or phosphorus. Graphite is common on the negative electrode.
Copper is important in wiring, windings and busbars because of its conductivity. Aluminium is widely used where lower mass is valuable. Some motor designs use permanent magnets containing rare-earth elements; others do not.
Steel, aluminium, glass, polymers and rubber still make up much of the vehicle. Electric cars change the material balance rather than replacing conventional materials altogether.
Why this object uses several materials
Most manufactured objects solve several problems at once: strength, electrical conduction, thermal behaviour, corrosion resistance, weight, appearance and cost. One pure material rarely satisfies all of them.
That is why a useful way to read an object is part by part. Each component reveals a different compromise between chemistry, physics and engineering.
What changes in practice
Real examples often add one more layer: geometry, impurities, coatings, humidity, flow or manufacturing history can alter what you observe even when the main mechanism is unchanged.
That is why two objects made from broadly similar materials can behave differently. The useful question is not only “what is it made of?” but also “how is it built, under what conditions, and for which function?”