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?
Correct answer: C
Explanation
In lithium-ion batteries, the cathode is typically made of materials that include Cobalt, Lithium, and Nickel, depending on the chemistry used.
* I. Cobalt: Used in cathodes like LCO and NMC. * II. Graphite: Used in the anode, not the cathode. * III. Lithium: Core element in cathode materials (like LCO, LFP). * IV. Nickel: Found in cathode types like NMC and NCA.
Three of the four are used in cathodes.
Alternatively, you can use mnemonic CoLiNi to remember Cathode forming materials.