Coulombic Efficiency and Inefficiency

Coulombic Efficiency and Inefficiency

Coulombic Efficiency (CE) revealed

Coulombic Efficiency (CE) is the single most important metric when projecting the future performance of a battery. It describes the charge efficiency by which electrons are transferred to batteries to create a charge.

Another way to put it is “How much of what is put in, is returned back out?”. After all, that’s the job of a battery; to store energy so that it can be used to get work done at a later time and place, on demand. The more a battery can give back of what is put in, the better that battery should be. This is Coulombic Efficiency (CE).

Coulombic Efficiency (CE)can be correlated to lifespan

If we look at how a waterwheel is powered with each full cycle, over time there is some water loss which represents lithium ions that are lost during the charge and discharge cycles. The least amount of water loss or lithium-ion loss during the cycles, the closer the CE is to 1 and the longer the potential lifespan of a battery.

The NOVONIX UHPC system measures how much reversible capacity is lost cycle-to-cycle, even in very small amounts. This is why with UHPC equipment, it is so important to be able to get very precise and accurate measurements. Customers can gain insight into degradation mechanisms within a cell and allow quantitative comparisons between cells after only a fraction of their cycle life. 

Look below to explore Coulombic Efficiency in more detail with our 4-part blog series.

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