In the context of electric vehicle batteries, consider the following elements : I. Cobalt II. Graphite III. Lithium IV. Nickel How many of the above usually make up battery cathodes?
A
Only one
B
Only two
C
Only three
Correct Answer
D
All the four
Explanation
Lithium, Cobalt, and Nickel are the primary active materials used in the cathodes of most high-performance EV batteries, such as Lithium Nickel Manganese Cobalt Oxide (NMC) and Lithium Cobalt Oxide (LCO). Graphite is the most tempting distractor because it is a critical battery element, but it functions as the anode (negative electrode) rather than the cathode. The core concept being tested is the chemical composition and internal architecture of Lithium-ion battery cells.
Battery TechnologyLithium-ion BatteriesElectric VehiclesLithium-ion BatteryCathodeCritical MineralsCobaltGraphite