Question

1- Which of the following batteries has the highest energy density:

A- Lead Acid battery

B- Ni-Cd battery

C- Lithium-air battery

D- Lithium-ion battery

E- Lithium-sulfur battery

2- which of the following factors will contribute to the irreversible losses of electrical energy in a practical fuel cell:

A- Activation Polarization

B- Ohmic Polarization

C- Concentration polarization

D- None of the above

E- All of the above

Answer 1

1. Option c is correct answer

Lithium - Air battery has highest energy density approximately 2000Wh/l

The energy densities of remaining batteries are

1.lead acid battery-80-90Wh/l

2.Ni-cd battery-50-150 Wh/l

3.lithium-ion battery- 250- 693 Wh/l

4.lithium - sulfer battery - 400Wh/l

2. Option E is a correct answer

In a practical fuel cell we have different losses like activation, ohmic, concentration and fuel cross over losses are effect so the all activation, ohmic and concentration polarizations are contribute to the irreversible losses of electrical energy in a practical fuel cell.