Q3.
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?
Answer
C
Explanation
lithium-ion battery typically has: a cathode (positive an anode (negative electrode) and Cobalt: It is commonly used in cathodes of batteries Lithium Cobalt Oxide (LCO), NMC (Nickel Cobalt), and NCA (Nickel Cobalt Aluminum). improves energy density and battery life. Thus I is correct. Graphite: It is used in the anodes, not the cathode. it’s the most common anode material in batteries. This option II is not correct. Lithiu: It is present in both cathodes and electrolyte. the cathode, it forms compounds like LiCoO₂, LiNiMnCoO₂, etc. Thus option III is correct. Nickel: Nickel is used in cathodes like NMC and NCA. energy density and storage capacity. Thus IV is correct. option (c) is the correct answer.