Small “Memory-Effect” Was Discovered in Li-Ion Batteries

Memory effect is most known from older battery types, but the new study shows that the phenomenon also exists in newer Li-ion batteries-though much less of.

Older types of batteries have been known to have a so-called memory effect which made the battery could “forget” how much capacity it had, if it had not been completely discharged from time to time.

A new study has now shown that this phenomenon can also occur in batteries of type lithiumjern-phosphate (LiFePO4) where we had not expected to see the effect. However, it is on a much smaller scale than with the old battery types.

On the microscopic level

When the battery is charging and drain, recorder and released lithium ions. Here there is proven a non-linear effect which means that when some particles release their lithium-ion, they do not change their chemical potential.

As a result, when the battery drains, these particles will not be able to absorb ions which leads to the so-called memory effect. The battery will stop to cede power, even if it’s not in the chemical sense is completely discharged.

Medopdager Petr Novak explains that the effect is very small and can be remedied by better battery software because the memory-effect can be deleted, by letting the battery be over a longer period of time.