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?
- AOnly one
- BOnly two
- COnly threeCorrect
- DAll the four
Explanation
In electric vehicle batteries, typically three elements make up battery cathodes:
I. Cobalt: Yes, cobalt is a key component in many lithium-ion battery cathodes, particularly in NCM (Nickel-Cobalt-Manganese) and NCA (Nickel-Cobalt-Aluminum) chemistries.
II. Graphite: No, graphite is primarily used in the anode (negative electrode) of lithium-ion batteries, not the cathode.
III. Lithium: Yes, lithium compounds like lithium cobalt oxide (LiCoO2) or lithium iron phosphate (LiFePO4) form the base of most EV battery cathodes.
IV. Nickel: Yes, nickel is increasingly used in high-energy density cathodes, especially in NCM and NCA chemistries for better performance and reduced cobalt dependency.
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