Electronic – Li-ion Battery Rejuvenation

batteriesbattery-chemistrychargelithium ionrepair

What can be done to repair or restore an ageing/dead/failing Li-ion rechargeable battery?

As they get older; they typically, gradually lose their capacity to hold a charge. What physical and/or chemical differences are there between new and old?

Best Answer

While there are certainly design and maintenance practices that can help to prevent or slow degradation, there's not really any practical way to repair degradation that has already happened to a given cell.

However, often a battery is made from multiple cells. And it's often practical to find out which of those are the weakest in terms of reduced capacity and higher internal resistance. If they're in series, the weakest cell will determine the effective capacity of the whole pack. So you can replace just the weak cells to rejuvenate the battery as a whole. Or, since typically the cells are much cheaper than the pack as a whole, just replace all of them.

Be careful, this can be quite hazardous - be sure to research how to do it safely before attempting!