UPSC CSE Prelims
Question 92
In the context of electric vehicle batteries, consider the following elements :
- Cobalt
- Graphite
- Lithium
- Nickel
How many of the above usually make up battery cathodes?
View correct answer and explanation
Correct answer: C
Correct Option: C (Only three)
Explanation: Lithium-ion battery cathodes commonly contain lithium and transition metals such as cobalt and nickel. Graphite is usually the negative-electrode/anode material, so three listed elements are associated with cathodes.
Statement / Pair / Item-wise Analysis:
I: Cobalt-used in cathode chemistries such as NMC/LCO.
II: Graphite-usually the anode, not cathode.
III: Lithium-essential cathode-ion constituent.
IV: Nickel-used in nickel-rich NMC/NCA cathodes.
Option-wise Analysis:
A. Incorrect-'Only one' understates the verified count of 3.
B. Incorrect-'Only two' understates the verified count of 3.
C. Correct-this matches the facts and the item-wise assessment above.
D. Incorrect-'All the four' overstates the verified count of 3.