Also called faradic efficiency, faradic yield, coulombic efficiency or current efficiency.
A ratio between output (discharging) and input (charging) capacity of the battery.
Faraday efficiency (also called faradaic efficiency, faradaic yield, coulombic efficiency or current efficiency) describes the efficiency with which charge (electrons) are transferred in a system facilitating an electrochemical reaction. The word “faraday” in this term has two interrelated aspects. First, the historic unit for charge is the faraday, but has since been replaced by the coulomb. Secondly, the related Faraday’s constant correlates charge with moles of matter and electrons (amount of substance).
Coulombic Efficiency on WiKi: http://en.wikipedia.org/wiki/Faraday_efficiency
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