Question

What is the energy density of the LiFePO 4 battery (Wh/Kg) considering
Molecular mass Li: 6.9 g/mol, Fe: 55.8 g/mol, P:31 g/mol, O:16 g/mol C:12 g/mol and Faraday’s number is 96485 C/mol.

Answer 1

Answer: 170 mAh/g

Explanation:

Total molecular mass LiFePO: 157.7 g/mol.

Storing one mole Li corresponds to storing 96485 C (Faraday’s number) in one mole LiFePO, Therefore the specific capacity is 96485/157.7

= 612 C/g

= 612 A*s/g

= 612 A*(1/3600h)/g

= 0.17 Ah/g

= 170 mAh/g.