Anode
Graphite is common in commercial cells and can host lithium between its carbon layers during charging.
Mendeleev
Mendeleev.com
What is inside a lithium-ion battery?
A rechargeable cell moves lithium ions between two host materials while electrons travel through the external circuit.
Part by part
Cathode
A lithium-containing metal oxide or phosphate stores and releases lithium ions; chemistry varies widely between battery types.
Electrolyte
An ion-conducting liquid or other medium allows lithium ions to move between electrodes.
Separator and collectors
A porous separator prevents direct electronic contact while allowing ion transport; metal foils collect electrical current.
“Lithium-ion battery” describes a family, not one fixed recipe. Cathode chemistry, electrolyte formulation, additives and cell construction vary with the application.
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?”