A lithium-ion cell has an equilibrium (open-circuit) voltage

PHYSICS · Subjective · Fermi University Physics · Electricity, Magnetism & Electromagnetism · Earth, Climate & Energy Physics · Electric current and circuits

Energy from Physics, Ch Storing energy: cells, rotors, air, heat and hydrogen

Problem

E = 3.6\,\mathrm{V}

, an internal resistance

R_{\rm int} = 15\,\mathrm{m\Omega}

, and a rated capacity of

2.5\,\mathrm{Ah}

. Find its round-trip efficiency when it is charged and discharged at a rate of

1\,\mathrm{C}

(a current equal to its capacity, drawn or supplied over one hour), taking the charge and discharge currents as equal in magnitude.

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