Answer :
Final answer:
In NiMH batteries, the electrolyte is indeed alkaline, and while their nominal voltage is lower compared to lead-acid batteries, it is not accurate to say they provide only one-fourth the power. The negative electrode in NiMH batteries is made from metal hydrides, not nickel hydroxide. Thus, the statement regarding power output in comparison to lead-acid batteries is incorrect.
Explanation:
Understanding NiMH Batteries
Nickel Metal Hydride (NiMH) batteries are widely used in various applications, including Hybrid Electric Vehicles (HEVs) like the Allison EV heavy-duty hybrids. Here are some clarifications on the points mentioned:
- The electrolyte is composed of an alkaline. - This statement is correct. NiMH batteries use an alkaline electrolyte, typically potassium hydroxide (KOH).
- NiMH batteries provide only one-fourth the power of lead-acid batteries, at 0.6 volts/cell compared to 2.1 volts/cell for lead-acid batteries. - This statement is incorrect. While lead-acid batteries do have a higher voltage per cell (around 2.1 volts), it is not accurate to say that NiMH batteries provide only one-fourth the power. For example, the overall energy density of NiMH batteries is often greater due to their ability to provide higher energy output over cycles.
- The negative electrode is made of nickel hydroxide (NiOH2). - This is also incorrect. In NiMH batteries, the negative electrode is typically made of a metal hydride, such as a metal alloy, which absorbs hydrogen ions during charging.
In summary, the statement about the power comparison between NiMH and lead-acid batteries is NOT correct. Although NiMH cells operate at a lower nominal voltage than lead-acid batteries, they often deliver better energy efficiency when considering the total capacity and energy output.
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