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?
Detailed Explanation:
In most Lithium-ion Electric Vehicle (EV) batteries, the cathode is made using combinations of Lithium, Cobalt, and Nickel.
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Statement I (Cobalt) ✅ Correct – Used in cathodes such as NMC and LCO batteries.
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Statement II (Graphite) ❌ Incorrect – Graphite is generally used in the anode, not the cathode.
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Statement III (Lithium) ✅ Correct – A key component of all lithium-ion battery cathodes.
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Statement IV (Nickel) ✅ Correct – Commonly used in NMC and NCA cathode chemistries.
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Therefore, only three elements (Cobalt, Lithium, and Nickel) usually make up battery cathodes, making Option C the correct answer.
Element-wise Analysis
| Element | Cathode Material? | Explanation |
|---|---|---|
| Cobalt | ✅ Yes | Used in LCO and NMC batteries. |
| Graphite | ❌ No | Primarily used in the anode. |
| Lithium | ✅ Yes | Essential component of lithium-ion cathodes. |
| Nickel | ✅ Yes | Improves energy density in NMC and NCA batteries. |
EV Battery Components
| Component | Common Material |
|---|---|
| Cathode | Lithium, Nickel, Cobalt, Manganese, Iron Phosphate |
| Anode | Graphite |
| Electrolyte | Lithium Salt Solution |
| Separator | Polymer Membrane |
Common Cathode Chemistries
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LCO – Lithium Cobalt Oxide
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NMC – Nickel Manganese Cobalt
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NCA – Nickel Cobalt Aluminum
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LFP – Lithium Iron Phosphate
Important Facts
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Cathode materials largely determine a battery's energy density and cost.
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Graphite remains the most widely used anode material in EV batteries.
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Demand for Lithium, Nickel, and Cobalt has increased significantly due to the global EV transition.
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