In the context of electric vehicle batteries, consider the following elements:CobaltGraphiteLithiumN

Question

In the context of electric vehicle batteries, consider the following elements:CobaltGraphiteLithiumNickelHow many of the above usually make up battery cathodes?

Accepted Answer

A lithium-ion battery typically has: a cathode (positive electrode), an anode (negative electrode) and electrolyte. I. Cobalt: It is commonly used in cathodes of batteries like Lithium Cobalt Oxide (LCO), NMC (Nickel Manganese Cobalt), and NCA (Nickel Cobalt Aluminum). Cobalt improves energy density and battery life. Thus option I is correct. II. Graphite: It is used in the anodes, not the cathode. Furthermore, it’s the most common anode material in lithium-ion batteries. This option II is not correct. III. Lithiu: It is present in both cathodes and electrolyte. In the cathode, it forms compounds like LiCoO₂, LiFePO₄, LiNiMnCoO₂, etc. Thus option III is correct. IV. Nickel: Nickel is used in cathodes like NMC and NCA. Enhances energy density and storage capacity. Thus option IV is correct. Hence option (c) is the correct answer.