What causes a lithium ion battery to deteriorate?

State of Charge In lithium-ion batteries, battery degradation due to SOC is the result of keeping the battery at a certain charge level for lengthy periods of time, either high or low. This causes the general health of battery to gradually deteriorate.

How a lithium ion battery is degraded?

The degradation of lithium-ion battery can be mainly seen in the anode and the cathode. In the anode, the formation of a solid electrolyte interphase (SEI) increases the impendence which degrades the battery capacity.

How to store a lithium ion battery?

The mechanisms of lithium-ion degradation are shown here. If you want to put them into storage, the most common recommendation is to charge/discharge them to about 50%. Too much or too little charge on a stored battery cause it to degrade faster. It should be stored above 0°C, but below 25°C (refrigerator, not freezer).

How much charge does a lithium ion battery lose per month?

For lithium-ion batteries, studies have shown that it is possible to lose 3 to 5 percent of charge per month, and that self-discharge is temperature and battery performance and its design dependent. In general, self-discharge is higher as the temperature increases.

Why does a lithium ion battery lose inventory?

Consumption of the cell’s lithium ions through SEI growth is one contributing factor to the degradation mode known as loss of lithium inventory (LLI). Because these reactions occur even when the cell is not in use, known as calendar aging, lithium-ion battery degradation is unavoidable.

How does charging and discharging affect lithium-ion battery degradation?

The cycle of charging and discharging plays a large role in lithium-ion battery degradation, since the act of charging and discharging accelerates SEI growth and LLI beyond the rate at which it would occur in a cell that only experiences calendar aging. This is called cycling-based degradation.